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PTH08T250W

www.ti.com

SLTS278G –NOVEMBER 2010–REVISED MARCH 2009

50-A, 4.5-V to 14-V INPUT, NON-ISOLATED,

WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans™

Check for Samples: PTH08T250W

FEATURES

• TurboTrans™ Technology

• Up to 50-A Output Current

• Designed to meet Ultra-Fast Transient

Requirements up to 300 A/ms

• 4.5-V to 14-V Input Voltage

• SmartSync Technology

• Wide-Output Voltage Adjust (0.7 V to 3.6 V)

• Parallel Operation

• ±1.5% Total Output Voltage Variation

• POLA™ Compatible

• Efficiencies up to 96%

• Output Overcurrent Protection

APPLICATIONS

(Nonlatching, Auto-Reset)

• Complex Multi-Voltage Systems

• Operating Temperature: –40°C to 85°C

• Servers

• Safety Agency Approvals:

• Workstations

– UL/IEC/CSA-C22.2 60950-1

• Prebias Startup

• On/Off Inhibit

• Differential Output Voltage Remote Sense

• Adjustable Undervoltage Lockout

• Auto-Track™ Sequencing

• Multi-Phase, Switch-Mode Topology

DESCRIPTION

The PTH08T250W is a high-performance 50-A rated, non-isolated power module. This module represents the

2nd generation of the popular PTH series power modules with a reduced footprint and improved features.

Operating from an input voltage range of 4.5 V to 14 V, the PTH08T250W requires a single resistor to set the

output voltage to any value over the range, 0.7 V to 3.6 V. The wide input voltage range makes the

PTH08T250W particularly suitable for advanced computing and server applications that utilize a loosely

regulated 8-V to 12-V intermediate distribution bus. Additionally, the wide input voltage range increases design

flexibility by supporting operation with tightly regulated 5-V, 8-V, or 12-V intermediate bus architectures.

The module incorporates a comprehensive list of features. Output overcurrent and over-temperature shutdown

protects against most load faults. A differential remote sense ensures tight load regulation. An adjustable

under-voltage lockout allows the turn-on voltage threshold to be customized. Auto-Track™ sequencing is a

popular feature that greatly simplifies the simultaneous power-up and power-down of multiple modules in a

power system. Additionally, the capability to current share between multiple PTH08T250W modules allows for

load currents greater than 50 A on a single rail.

The PTH08T250W includes new patent pending technologies, TurboTrans™ and SmartSync. The TurboTrans

feature optimizes the transient response of the regulator while simultaneously reducing the quantity of external

output capacitors required to meet a target voltage deviation specification. Additionally, for a target output

capacitor bank, TurboTrans can be used to significantly improve the regulators transient response by reducing

the peak voltage deviation. SmartSync allows for switching frequency synchronization of multiple modules, thus

simplifying EMI noise suppression tasks and reducing input capacitor RMS current requirements.

Double-sided surface mount construction provides a low profile and compact footprint. Package options include

both through-hole and surface mount configurations that are lead (Pb) - free and RoHS compatible.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2TurboTrans, Auto-Track, TMS320 are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (39 pages)

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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 50-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans™ Check for Samples: PTH08T250W FEATURES 1 • • • • • • 2 • • • • • • • • Up to 50-A Output Current 4.5-V to 14-V Input Voltage Wide-Output Voltage Adjust (0.7 V to 3.6 V) ±1.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com ELECTRICAL CHARACTERISTICS PTH08T250W TA = 25°C, VI = 12 V, VO = 3.3 V, CI = 1000 µF, CO = 660 µF, and IO = IO max (unless otherwise stated) PARAMETER TEST CONDITIONS PTH08T250W MIN IO Output current Over VO range VI Input voltage range Over IO range VOADJ Output voltage adjust range Over IO range 0 48 60°C, 200 LFM 0 50 0.7 ≤ VO < 1.2 4.5 1.2 ≤ VO ≤ 3.6 4.5 3.6 ±0.5 ±0.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 ELECTRICAL CHARACTERISTICS PTH08T250W (continued) TA = 25°C, VI = 12 V, VO = 3.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com TERMINAL FUNCTIONS TERMINAL NAME NO. VI DESCRIPTION 6,7,14,15 The positive input voltage power node to the module, which is referenced to common GND. VO 10,11 GND 8,9,12,13 Inhibit (1) and UVLO Vo Adjust 21 The regulated positive power output with respect to GND. This is the common ground connection for the VI and VO power connections. It is also the 0 Vdc reference for the control inputs.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 TYPICAL CHARACTERISTICS (1) (2) CHARACTERISTIC DATA ( VI = 12 V) EFFICIENCY vs LOAD CURRENT OUTPUT RIPPLE vs LOAD CURRENT 14 100 12 3.3 VOUT (V) VOUT (V) 90 85 80 2.5 1.8 75 1.5 1.2 VOUT (V) 1.0 70 3.3 2.5 1.8 1.5 1.2 1.0 0.7 0.7 65 60 55 3.3 2.5 1.8 1.5 1.2 1.0 12 10 2.5 3.3 8 1.8 1.2 6 1.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com TYPICAL CHARACTERISTICS (1) (2) CHARACTERISTIC DATA ( VI = 5 V) EFFICIENCY vs LOAD CURRENT 12 10 3.3 95 85 80 1.0 75 2.5 1.8 1.5 1.2 0.7 VOUT (V) 70 3.3 2.5 1.8 1.5 1.2 1.0 0.7 65 60 55 VOUT (V) 9 VO - Ouptut Voltage Ripple - VPP (mV) 90 h - Efficiency - % POWER DISSIPATION vs LOAD CURRENT VOUT (V) 3.3 2.5 1.8 1.2 0.7 8 7 3.3 2.5 0.7 6 5 1.2 4 1.8 20 30 IO - Output Current - A 40 1.8 6 1.2 4 0.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 APPLICATION INFORMATION ADJUSTING THE OUTPUT VOLTAGE The Vo Adjust control sets the output voltage of the PTH08T250W. The adjustment range of the PTH08T250W is 0.7 V to 3.6 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected directly between pins Vo Adjust (pin 18) and AGND (pin 4).
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com Table 2. Output Voltage Set-Point Resistor Values VO Required (V) (1) 10 RSET (kΩ) VO Required (V) RSET (kΩ) 0.70 (1) Open 2.10 8.66 0.75 (1) 412 2.20 7.50 0.80 (1) 205 2.30 6.65 0.85 (1) 133 2.40 5.90 0.90 (1) 97.6 2.50 5.23 0.95 (1) 78.7 2.60 4.64 1.00 (1) 63.4 2.70 4.02 1.10 (1) 46.4 2.80 3.57 1.20 35.7 2.90 3.09 1.30 28.7 3.00 2.67 1.40 23.7 3.10 2.26 1.50 19.6 3.20 1.96 1.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 CAPACITOR RECOMMENDATIONS FOR THE PTH08T250W POWER MODULE Capacitor Technologies Electrolytic Capacitors When using electrolytic capacitors, high quality, computer-grade electrolytic capacitors are recommended. Aluminum electrolytic capacitors provide adequate decoupling over the frequency range, 2 kHz to 150 kHz, and are suitable when ambient temperatures are above -20°C.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com Output Capacitor (Required) The PTH08T250W requires a minimum output capacitance of 660 mF of polymer-aluminum, tantalum, or polymer-tantalum type. Ceramic capacitors may be used in addition to the required bulk capacitance. The required capacitance above the minimum is determined by actual transient deviation requirements. See the TurboTrans Technology application section within this document for specific capacitance selection.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 Designing for Fast Load Transients The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of 2.5 A/µs. The typical voltage deviation for this load transient is given in the Electrical Characteristics table using the minimum required value of output capacitance.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com Table 3. Input/Output Capacitors(1) (continued) Capacitor Characteristics Capacitor Vendor, Type Series (Style) Nichicon, Aluminum Max. Working ESR at Value Voltage 100 (µF) (V) kHz (Ω) 25 560 0.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 TurboTrans™ Technology TurboTrans technology is a feature introduced in the T2 generation of the PTH/PTV family of power modules. TurboTrans optimizes the transient response of the regulator with added external capacitance using a single external resistor.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com PTH08T250W Type B Capacitors 5-V INPUT 8 8 7 7 Without TurboTrans 6 6 5 5 4 4 Transient - mV/A 3 2 With TurboTrans 3 2 With TurboTrans C - Capacitance - mF 5000 6000 7000 8000 9000 10000 4000 3000 600 700 800 900 1000 5000 6000 7000 8000 9000 10000 4000 2000 3000 1 600 700 800 900 1000 1 Without TurboTrans 2000 Transient - mV/A 12-V INPUT C - Capacitance - mF Figure 12.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 PTH08T250W Type C Capacitors 5-V INPUT 8 8 7 7 Without TurboTrans 6 6 5 5 4 4 Transient - mV/A 3 2 With TurboTrans 3 2 With TurboTrans C - Capacitance - mF 5000 6000 7000 8000 9000 10000 4000 3000 600 700 800 900 1000 5000 6000 7000 8000 9000 10000 4000 2000 3000 1 600 700 800 900 1000 1 Without TurboTrans 2000 Transient - mV/A 12-V INPUT C - Capacitance - mF Figure 14.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com TurboTrans AutoTrack RTT 7.87 kW TurboTrans +Sense VI +Sense VI VO VO PTH08T250W Inhibit/UVLO + -Sense CO 2000 mF Type B + SmartSync Config CI 1000 mF (Required) CI2 22 mF GND AGND VOAdj L O A D -Sense RSET GND GND UDG-07101 Figure 16.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 Soft-Start Power Up The Auto-Track feature allows the power-up of multiple PTH/PTV modules to be directly controlled from the Track pin. However in a stand-alone configuration, or when the Auto-Track feature is not being used, the Track pin should be directly connected to the input voltage, VI (see Figure 17).
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com On/Off Inhibit For applications requiring output voltage on/off control, the PTH08T250W incorporates an Inhibit control pin. The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to be turned off. The power modules function normally when the Inhibit pin is left open-circuit, providing a regulated output whenever a valid source voltage is connected to VI with respect to GND.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 Smart Sync Smart Sync is a feature that allows multiple power modules to be synchronized to a common frequency. When not used, this pin must be connect to GND. Driving the Smart Sync pins with an external oscillator set to the desired frequency, synchronizes all connected modules to the selected frequency.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com Operating the PTH08T250W with a low duty cycle may increase the output voltage ripple. When operating at the nominal switching frequency, input voltages greater than (VO × 12) may cause the output voltage ripple to increase (up to 2×). When using Smart Sync, the minimum duty cycle varies as a function of output voltage and switching frequency. Synchronizing to a higher frequency causes greater restrictions on the duty cycle range.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 Auto-Track™ Function The Auto-Track function is unique to the PTH/PTV family, and is available with all POLA products. Auto-Track was designed to simplify the amount of circuitry required to make the output voltage from each module power up and power down in sequence.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com Notes on Use of Auto-Track™ 1. The Track pin voltage must be allowed to rise above the module set-point voltage before the module regulates at its adjusted set-point voltage. 2. The Auto-Track function tracks almost any voltage ramp during power up, and is compatible with ramp speeds of up to 1 V/ms. 3. The absolute maximum voltage that may be applied to the Track pin is the input voltage VI. 4.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 VTRK (1 V/div) VTRK (1 V/div) VO1 (1 V/div) VO1 (1 V/div) VO2 (1 V/div) VO2 (1 V/div) t − Time − 20 ms/div t − Time − 400 ms/div Figure 25. Simultaneous Power Up With Auto-Track Control Figure 26.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com ADJUSTING THE UNDERVOLTAGE LOCKOUT (UVLO) The PTH08T250W power modules incorporate an input undervoltage lockout (UVLO). The UVLO feature prevents the operation of the module until there is sufficient input voltage to produce a valid output voltage.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 CURRENT SHARING The PTH08T250W module is capable of being configured in parallel with another PTH08T250W module to share load current. To parallel the two modules, it is necessary to configure one module as the Master and one module as the Slave. To configure a module as the Master, connect the CONFIG pin (pin 1) to GND. The CONFIG pin of the Slave must be connected to VI.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com Table 7. Required Connections for Current Sharing (1) TERMINAL NAME MASTER NO. VI 6,7,14,15 VO 10,11 GND 8,9,12,13 SLAVE Connect to the Input Bus. Connect to the Input Bus. Connect to the Output Bus. Connect to the Output Bus. Connect to Common Power GND. Connect to Common Power GND. No Connection. Leave open-circuit. Inhibit and UVLO 21 Use for Inhibit control & UVLO adjustments. If unused leave open-circuit.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 AMBIENT TEMPERATURE vs OUTPUT CURRENT 90 90 80 80 TA - Ambient Temperature - °C TA - Ambient Temperature - °C AMBIENT TEMPERATURE vs OUTPUT CURRENT 70 400 LFM 60 VI = 12 V VO = 3.3 V 50 200 LFM Airflow 400 LFM 40 200 LFM 30 100 LFM 400 LFM 60 200 LFM VI = 12 V VO = 1.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.com Current Sharing Layout In current sharing applications the VI pins of both modules must be connected to the same input bus. The VO pins of both modules are connected together to power the load. The GND pins of both modules are connected via the GND plane. Four other inter-connection pins are connected between the modules. Figure 33 shows the required layout of the inter-connection pins for two modules configured to share current.
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PTH08T250W www.ti.com SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 The prebias start-up feature is not compatible with Auto-Track. When the module is under Auto-Track control, it sinks current if the output voltage is below that of a back-feeding source. To ensure a pre-bias hold-off one of two approaches must be followed when input power is applied to the module. The Auto-Track function must either be disabled(3), or the module’s output held off (for at least 50 ms) using the Inhibit pin.
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PTH08T250W SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009 www.ti.
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PTH08T250W www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.