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SLUS274A – JANUARY 1999 – REVISED APRIL 2003

     

www.ti.com

FEATURES

Precision Fault Threshold

D Programmable Average Power Limiting

D Programmable Linear Current Control

D Programmable Overcurrent Limit

D Programmable Fault Time

D Fault Output Indicator

D Shutdown Control

D Undervoltage Lockout

D 8-Pin SOIC

APPLICATIONS

–48-V Distributed Power Systems

D Central Office Switching

D Wireless Base Stations

DESCRIPTION

The UCCx913 family of negative voltage circuit

breakers provides complete power management,

hot-swap, and fault handling capability. The

device is referenced to the negative input voltage

and is driven through an external resistor

connected to ground, which is essentially a

current drive as opposed to the traditional voltage

drive. The on-board 10-V shunt regulator protects

the device from excess voltage and serves as a

reference for programming the maximum

allowable output sourcing current during a fault. In

the event of a constant fault, the internal timer

limits the on-time from less than 0.1% to a

maximum of 3%. The duty cycle modulates

depending on the current into the PL pin, which is

a function of the voltage across the FET, and limits

average power dissipation in the FET. The fault

level is fixed at 50 mV across the current-sense

resistor to minimize total dropout. The fault current

level is set with an external current sense resistor.

The maximum allowable sourcing current is

programmed with a voltage divider from VDD to

generate a fixed voltage on the IMAX pin. The

current level, when the output appears as a

current source, is equal to V

IMAX

SENSE

. If

desired, a controlled current startup can be

programmed with a capacitor on the IMAX pin.

When the output current is below the fault level,

the output device is switched on. When the output

current exceeds the fault level, but is less than the

maximum sourcing level programmed by the

IMAX pin, the output remains switched on, and the

fault timer starts charging CT. Once CT charges to

2.5 V, the output device is turned off and performs

a retry some time later. When the output current

reaches the maximum sourcing current level, the

output appears as a current source, limiting the

output current to the set value defined by IMAX.

Other features of the UCCx913 family include

undervoltage lockout, and 8-pin small outline

(SOIC) and dual-in-line (DIP) packages.

        

         

       

   

–VIN

UCC3913

Power

Limiting

Current

Control

Fault

Protection

and

Timer

DC/DC

Converter

or Load

VDD

SIMPLIFIED APPLICATION DIAGRAM

VDD

UDG–03059

Summary of content (21 pages)

PAGE 1
SLUS274A – JANUARY 1999 – REVISED APRIL 2003 FEATURES D Precision Fault Threshold D Programmable Average Power Limiting D Programmable Linear Current Control D Programmable Overcurrent Limit D Programmable Fault Time D Fault Output Indicator D Shutdown Control D Undervoltage Lockout D 8-Pin SOIC DESCRIPTION APPLICATIONS D –48-V Distributed Power Systems D Central Office Switching D Wireless Base Stations SIMPLIFIED APPLICATION DIAGRAM RVDD R1 DC/DC Conve
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SLUS274A – JANUARY 1999 – REVISED APRIL 2003 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION TA –40°C 40°C to 85°C –0°C 0°C to 70°C PACKAGE(1) PART NUMBER PDIP (N) UCC2913N SOIC (D) UCC2913D PDIP (N) UCC3913N SOIC (D) UCC3913D (1) The N and D packaged are also available taped and reeled.
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SLUS274A – JANUARY 1999 – REVISED APRIL 2003 ELECTRICAL CHARACTERISTICS TA = –40°C to 85°C for UCC2913, TA = 0°C to 70°C for UCC3913, TJ = TA, IVDD = 2 mA, CT = 4.7 pF, TA = TJ (unless otherwise noted) MIN TYP 1 2 8.5 9.5 10.5 6 7 8 TJ = 25 °C Over temperature 47.5 50.0 53.0 46.0 50.0 53.5 50 500 nA –22 –36 –50 µA Timing capacitance charge current VCT = 1.0 V, IPL = 0 A Overload condition, VSENSE – VIMAX = 300 mV –0.7 –1.2 –1.
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SLUS274A – JANUARY 1999 – REVISED APRIL 2003 TERMINAL FUNCTIONS TERMINAL NAME NO. CT 4 IMAX OUT I/O DESCRIPTION I A capacitor is connected to this pin in order to set the maximum fault time. 2 I This pin programs the maximum allowable sourcing current. 7 O Output drive to the MOSFET pass element. PL 8 I This feature ensures that the average MOSFET power dissipation is controlled. SENSE 6 I Input voltage from the current sense resistor.
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SLUS274A – JANUARY 1999 – REVISED APRIL 2003 DETAILED PIN DESCRIPTIONS (continued) SD/FLT This pin provides fault output indication and shutdown control. Interface into and out of this pin is usually performed through level shift transistors. When 20 µA is sourced into this pin, shutdown drives high causing the output to disable the N-channel MOSFET pass device. When opened, and under a non-fault condition, the SD/FLT pin pulls to a low state.
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SLUS274A – JANUARY 1999 – REVISED APRIL 2003 APPLICATION INFORMATION Typical Fault Mode Figure 1 shows the detailed circuitry for the fault timing function of the UCCx913. This initial discussion of the typical fault mode ignores the overload comparator, and current source I3. Once the voltage across the current sense resistor, RS, exceeds 50 mV, a fault has occurred. This causes the timing capacitor to charge with a combination of 36 µA plus the current from the power limiting amplifier.
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SLUS274A – JANUARY 1999 – REVISED APRIL 2003 APPLICATION INFORMATION During a fault, CT charges at a rate determined by the internal charging current and the external timing capacitor. Once CT charges to 2.5 V, the fault comparator switches and sets the fault latch. Setting of the fault latch causes both the output to switch off and the charging switch to open. CT must now discharge with the 1-µA current source, I2, until 0.5 V is reached. Once the voltage at CT reaches 0.
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SLUS274A – JANUARY 1999 – REVISED APRIL 2003 APPLICATION INFORMATION Determining External Component Values (See FIgure 2) To set RVDD the following must be achieved: V IN(min) R VDD u 10 V ) 2 mA (R1 ) R2) (11) In order to estimate the minimum timing capacitor, CT, several things must be taken into account. For example, given the schematic below as a possible (and at this point, a standard) application, certain external component values must be known in order to estimate CT(min).
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SLUS274A – JANUARY 1999 – REVISED APRIL 2003 APPLICATION INFORMATION TIMING DIAGRAM IOUT Output Current IMAX IFAULT Io(nom) t 0A VCT 2.5V CT Voltage (w/respect to VSS) 0.5V t 0V VOUT 0V Output Voltage (w/respect to GND) VSS TIME t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t DESCRIPTION t0 Safe condition. Output current is nominal, output voltage is at the negative rail, VSS. t1 Fault control reached. Output current reaches the programmed fault value.
PAGE 10
SLUS274A – JANUARY 1999 – REVISED APRIL 2003 APPLICATION INFORMATION CVDD R1 R2 VSS RVDD CSS IMAX VDD 3 OUTPUT 2 PL 8 UVLO 5.0 V REF RT 1 = UNDERVOLTAGE 9.5 SHUNT REGULATOR VDD SD/FLT – VDD VDD – + + LOGIC SUPPLY OUT + – + LINEAR CURRENT AMPLIFIER 7 50 Ω DISABLE 1 SENSE + 20 µA + ON–TIME CONTROL SOURCE ONLY – 6 FAULT= 50 mV RS VSS 5 CT 4 CT VSS UDG–99002 Figure 3. Typical Application Diagram To calculate the startup time using the current source load.
PAGE 11
SLUS274A – JANUARY 1999 – REVISED APRIL 2003 APPLICATION INFORMATION Once tSTART is calculated, the power limit feature of the UCCx913 must be addressed and component values derived.
PAGE 12
SLUS274A – JANUARY 1999 – REVISED APRIL 2003 SAFETY RECOMMENDATION Although the UCC3913 is designed to provide system protection for all fault conditions, all integrated circuits can ultimately fail short. For this reason, if the UCC3913 is intended for use in safety critical applications where UL or some other safety rating is required, a redundant safety device such as a fuse should be placed in series with the device.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 28-Nov-2013 TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant UCC2913DTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UCC3913DTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC2913DTR SOIC D 8 2500 367.0 367.0 35.0 UCC3913DTR SOIC D 8 2500 367.0 367.0 35.
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MECHANICAL DATA MCER001A – JANUARY 1995 – REVISED JANUARY 1997 JG (R-GDIP-T8) CERAMIC DUAL-IN-LINE 0.400 (10,16) 0.355 (9,00) 8 5 0.280 (7,11) 0.245 (6,22) 1 0.063 (1,60) 0.015 (0,38) 4 0.065 (1,65) 0.045 (1,14) 0.310 (7,87) 0.290 (7,37) 0.020 (0,51) MIN 0.200 (5,08) MAX Seating Plane 0.130 (3,30) MIN 0.023 (0,58) 0.015 (0,38) 0°–15° 0.100 (2,54) 0.014 (0,36) 0.008 (0,20) 4040107/C 08/96 NOTES: A. B. C. D. E. All linear dimensions are in inches (millimeters).
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.