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LM5041A

www.ti.com

SNVS350B –MARCH 2005–REVISED MARCH 2013

LM5041A Cascaded PWM Controller

Check for Samples: LM5041A

FEATURES

DESCRIPTION

The LM5041A PWM controller contains all of the

• Internal Start-up Bias Regulator

features necessary to implement either current-fed or

• Programmable Line Under-Voltage Lockout

voltage-fed push-pull or bridge power converters.

(UVLO) with Adjustable Hysteresis

These “Cascaded” topologies are well suited for

• Current Mode Control

multiple output and higher power applications. The

LM5041A’s four control outputs include: the buck

• Internal Error Amplifier with Reference

stage controls (HD and LD) and the push-pull control

• Cycle-by-cycle Over-Current Protection

outputs (PUSH and PULL). Push-pull outputs are

• Leading Edge Blanking

driven at 50% nominal duty cycle at one half of the

switching frequency of the buck stage and can be

• Programmable Push-Pull Overlap or Dead

configured for either an overlap time (for current-fed

Time

applications) or a both-off time (for voltage-fed

• Internal 1.5A Push-Pull Gate Drivers

applications). Push-pull stage MOSFETs can be

• Programmable Soft-Start

driven directly from the internal gate drivers while the

buck stage requires an external driver such as the

• Programmable Oscillator with Sync Capability

LM5102. The LM5041A includes a high-voltage start-

• Precision Reference

up regulator that operates over a wide input range of

• Thermal Shutdown

15V to 100V. The PWM controller is designed for

high-speed capability including an oscillator

frequency range up to 1 MHz and total propagation

APPLICATIONS

delays of less than 100ns. Additional features include:

• Telecommunication Power Converters

line Under-Voltage Lockout (UVLO), soft-start, an

• Industrial Power Converters

error amplifier, precision voltage reference, and

thermal shutdown.

• Multi-Output Power Converters

• +42V Automotive Systems

The two differences between the LM5041 and the

LM5041A are: No second level current limit in the 'A'

version No softstart (SS) shutdown comparator in the

'A' version.

PACKAGES

• TSSOP-16

• WSON-16 (5 mm × 5 mm) Thermally Enhanced

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.

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 (22 pages)

PAGE 1
LM5041A www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 LM5041A Cascaded PWM Controller Check for Samples: LM5041A FEATURES DESCRIPTION • • The LM5041A PWM controller contains all of the features necessary to implement either current-fed or voltage-fed push-pull or bridge power converters. These “Cascaded” topologies are well suited for multiple output and higher power applications.
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LM5041A SNVS350B – MARCH 2005 – REVISED MARCH 2013 www.ti.com Typical Application Circuit VOUT 33V - 76V VDD HB VCC VIN HD HI HO HS LD LM5041A LI RT LM5102 2 VSS LO RT1 RT2 PUSH FEED BACK PULL FB Figure 1. Simplified Cascaded Push-Pull Power Converter Connection Diagram 1 2 3 4 5 6 7 8 VIN UVLO FB RT COMP 15 14 TIME 13 REF SS HD CS LD AGND VCC PGND PUSH 16 12 11 10 9 PULL Figure 2.
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LM5041A www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 PIN DESCRIPTIONS PIN NAME DESCRIPTION APPLICATION INFORMATION 1 VIN Source Input Voltage Input to start-up regulator. Input range 15V to 100V. 2 FB Feedback Signal Inverting input for the internal error amplifier. The noninverting input is connected to a 0.75V reference. 3 COMP Output of the Internal Error Amplifier There is an internal 5kΩ resistor pull-up on this pin. The error amplifier provides an active sink.
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LM5041A SNVS350B – MARCH 2005 – REVISED MARCH 2013 www.ti.com Block Diagram 9V SERIES REGULATOR VIN VCC 5V REFERENCE VCC ENABLE VREF UVLO UVLO + - 2.5V LOGI C UVLO HYSTERESIS (20 PA) 45 PA CLK HD 5V SLOPE COMP RAMP GENERATOR COMP 0.75V 5k + FB - S PWM 100k Q LD + R 1.4V 50k Q LOGIC SS PGND CS 0.5V 2k + - CLK + LEB AGND 10 PA SS SS TIME VCC DRIVE R OSC CLK RT / SYNC OSCILLATOR DIVIDE BY 2 OVERLAP OR DEAD TIME CONTROL PUSH VCC DRIVE R PULL Figure 3.
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LM5041A www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 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. Absolute Maximum Ratings (1) (2) VIN to GND 100V VCC to GND 16V All Other Inputs to GND -0.
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LM5041A SNVS350B – MARCH 2005 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (continued) Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction Temperature range. VIN = 48V, VCC = 10V, RT = 26.7kΩ, RSET = 20kΩ) unless otherwise stated(1) Symbol Parameter Conditions Min Typ Max Units 5 5.15 V 25 50 mV Reference Supply VREF Ref Voltage IREF = 0 mA Ref Voltage Regulation IREF = 0 to 10mA 4.
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LM5041A www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 Electrical Characteristics (continued) Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction Temperature range. VIN = 48V, VCC = 10V, RT = 26.7kΩ, RSET = 20kΩ) unless otherwise stated(1) Symbol Parameter Conditions Min Typ Max Units Buck Stage Outputs Output High level 5 (VREF) V Output High Saturation IOUT = 10mA, REF = VOUT 0.
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LM5041A SNVS350B – MARCH 2005 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VCC and VIN vs VIN VCC vs ICC 10 20 VIN 8 VIN = 15V 6 VCC (V) VCC AND VIN (V) 15 VCC 10 4 5 2 0 0 5 0 15 10 20 0 5 10 15 20 25 ICC (mA) VIN (V) Figure 4. Figure 5. SS Pin Current vs Temp Frequency vs RT 13 1000 FREQUENCY (kHz) SS CURRENT (PA) 12 11 10 9 8 100 7 -25 25 75 125 10000 1000 TEMPERATURE ( C) Figure 6. Figure 7.
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LM5041A www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Dead Time vs Temp 120 130 110 120 DEAD TIME (ns) OVERLAP TIME (ns) Overlap Time vs Temp 100 RSET = 20k: 90 80 70 110 RSET = 20k: 100 90 80 70 60 -25 25 75 -25 125 o 25 75 125 o TEMPERATURE ( C) TEMPERATURE ( C) Figure 10. Figure 11. Error Amplifier Gain Phase Figure 12.
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LM5041A SNVS350B – MARCH 2005 – REVISED MARCH 2013 www.ti.com DETAILED OPERATING DESCRIPTION The LM5041A PWM controller contains all of the features necessary to implement either current-fed or voltagefed push-pull or bridge power converters. These “Cascaded” topologies are well suited for multiple output and higher power applications. The LM5041A’s four control outputs include: the buck stage controls (HD and LD) and the push-pull control outputs (PUSH and PULL).
PAGE 11
LM5041A www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 Push-Pull Outputs The push pull outputs operate continuously at a nominal 50% duty cycle. A distinguishing feature of the LM5041A is the ability to accurately configure either dead time (both-off) or overlap time (both-on) on the complementary push-pull outputs. The overlap/dead time magnitude is controlled by a resistor connected to the TIME pin on the controller. The TIME pin holds one end of the resistor at 2.
PAGE 12
LM5041A SNVS350B – MARCH 2005 – REVISED MARCH 2013 www.ti.com Current Limit/Current Sense The LM5041A provides cycle-by-cycle over-current protection. If the voltage at the CS comparator (CS pin voltage plus slope comp voltage) exceeds 0.5V the present buck stage duty cycle is terminated (cycle by cycle current limit). A small RC filter located near the controller is recommended to filter current sense signals at the CS pin.
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LM5041A www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 Typical Application VOUT T1 L1 33V - 76V VDD VDD HB VCC VIN HB HD HI HO HO + HI T1 HS HS LD LI + LI LO LM5102 LM5041A VSS LO LM5100 RT2 RT1 PUSH PULL COMP FEED BACK Figure 14.
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LM5041A SNVS350B – MARCH 2005 – REVISED MARCH 2013 www.ti.com Application Circuit: Input 35-80V, Output 2.
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LM5041A www.ti.com SNVS350B – MARCH 2005 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision A (March 2013) to Revision B • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 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 LM5041AMTCX/NOPB TSSOP PW 16 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM5041ASD/NOPB WSON NHQ 16 1000 178.0 12.4 5.3 5.3 1.3 8.0 12.0 Q1 LM5041ASDX/NOPB WSON NHQ 16 4500 330.0 12.4 5.3 5.3 1.3 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM5041AMTCX/NOPB LM5041ASD/NOPB TSSOP PW 16 2500 367.0 367.0 35.0 WSON NHQ 16 1000 210.0 185.0 35.0 LM5041ASDX/NOPB WSON NHQ 16 4500 367.0 367.0 35.
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MECHANICAL DATA NHQ0016A SDA16A (Rev A) www.ti.
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