sm72295x

Manufacturer Part Numbersm72295x
DescriptionPhotovoltaic Full Bridge Driver
ManufacturerNational Semiconductor Corporation
sm72295x datasheet
 


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Photovoltaic Full Bridge Driver
General Description
The SM72295 is designed to drive 4 discrete N type
MOSFET’s in a full bridge configuration. The drivers provide
3A of peak current for fast efficient switching and integrated
high speed bootstrap diodes. Current sensing is provided by
2 transconductance amplifiers with externally programmable
gain and filtering to remove ripple current to provide average
current information to the control circuit. The current sense
amplifiers have buffered outputs available to provide a low
impedance interface to an A/D converter if needed. An exter-
nally programmable input over voltage comparator is also
included to shutdown all outputs. Under voltage lockout with
a PGOOD indicator prevents the drivers from operating if
VCC is too low.
Typical Application Circuit
© 2011 National Semiconductor Corporation
SM72295
Features
Renewable Energy Grade
Dual Half Bridge MOSFET Drivers
Integrated 100V bootstrap diodes
Independent High and Low driver logic inputs
Bootstrap supply voltage range up to 115V DC
Two current sense amplifiers with externally
programmable gain and buffered outputs
Programmable over voltage protection
Supply rail under-voltage lockouts with power good
indicator
Package
SOIC-28
301341
February 25, 2011
30134101
www.national.com

sm72295x Summary of contents

  • Page 1

    ... A/D converter if needed. An exter- nally programmable input over voltage comparator is also included to shutdown all outputs. Under voltage lockout with a PGOOD indicator prevents the drivers from operating if VCC is too low. Typical Application Circuit © 2011 National Semiconductor Corporation SM72295 Features ■ Renewable Energy Grade ■ ...

  • Page 2

    ... Connection Diagram Ordering Information Order Number SM72295X SM72295E www.national.com Top View SOIC-28 Description NSC Package Drawing 28L SOIC WIDE M28B 28L SOIC WIDE M28B 2 30134116 Supplied As 1000 Units in Tape and Reel 250 Units in Tape and Reel ...

  • Page 3

    Pin Descriptions Pin Name Description 5 AGND Analog ground 23 PGND Power ground return 21,25 VCCA, Positive gate drive supply VCCB 26,20 HBA, High side gate driver bootstrap HBB rail. 27, 19 HOA, High side gate driver output HOB 28, ...

  • Page 4

    Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VCCA, VCCB VDD HBA to HSA, HBB to HSB LIA,LIB,HIA,HIB,OVS LOA,LOB HOA,HOB SIA,SOA,SIB,SOB SIA to SOA, SIB to SOB ...

  • Page 5

    Symbol Parameter LO & HO GATE DRIVER V Low-Level Output Voltage OL V High-Level Output Voltage OH I Peak Pullup Current OHL I Peak Pulldown Current OLL t LO Turn-Off Propagation Delay LI Falling to LO Falling LPHL t LO ...

  • Page 6

    Block Diagram www.national.com FIGURE 1. Block Diagram 6 30134102 ...

  • Page 7

    Typical Performance Characteristics Operating Current vs Temperature VCC Quiescent Current vs Temperature VDD Quiescent Current vs Temperature VCC Undervoltage Rising Threshold vs Temperature 30134111 VCC Undervoltage Threshold Hysteresis vs Temperature 30134112 Gate Drive High Level Output Voltage vs Temperature 30134115 ...

  • Page 8

    Gate Drive Low level Output Voltage vs Temperature Current Sense Amplifier Input Offset Voltage vs Temperature Timing Diagram www.national.com Bootstrap Diode Forward Voltage vs Temperature 30134110 Current Sense Amplifier Output Buffer Offset Voltage vs 30134107 FIGURE 2. 8 30134106 Temperature ...

  • Page 9

    Power Dissipation Considerations The total IC power dissipation is the sum of the gate driver losses and the bootstrap diode losses. The gate driver losses are related to the switching frequency (f), output load capac- itance on LO and HO ...

  • Page 10

    Physical Dimensions www.national.com NS Package Drawing M28B 10 30134150 ...

  • Page 11

    Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead TSSOP Package NS Package Number MXA20A 11 www.national.com ...

  • Page 12

    ... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...