High Current Half-Bridge with Over Current Shutdown

  • Rajkumar Sharma
  • 111 Views
  • moderate
  • Tested
  • SKU: EL120048
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The project presented here is a versatile high voltage Half-Bridge with Over-Current Shutdown. The project is built using LT1158 IC from Analog Devices. It is suited for many applications as listed below. A single input pin on the LT1158 synchronously controls two N-channel power MOSFETs IRF3710 in a totem pole configuration. Unique adaptive protection against shoot-through currents eliminates all matching requirements for the two MOSFETs. This greatly eases the design of high-efficiency motor control and switching regulator systems. A continuous current limit loop in the LT1158 regulates short-circuit current in the top power MOSFET. Higher start-up currents are allowed as long as the MOSFET VDS does not exceed 1.2V. By returning the FAULT output to the enable input, the LT1158 will automatically shut down in the event of a fault and retry when an internal pull-up current has recharged the enable capacitor. An on-chip charge pump is switched in when needed to turn on the top N-channel MOSFET continuously. Special circuitry ensures that the top side gate drive is safely maintained in the transition between PWM and DC operation. The gate-to-source voltages are internally limited to 14.5V when operating at higher supply voltages. The circuit requires a single PWM signal, duty cycle 0 to 99%, frequency 0 to 100Khz. Working supply range 12V to 24V DC.

Note: The Half-bridge driver is configured as over-current shutdown, don’t install R7 resistor and C8 capacitor if this feature is not required. In this case, Fault and Enable pins are available for the external interface. Read the datasheet of LT1158 for more information.

Connections

  • CN1 Connector: DC Supply input 12V to 24V DC
  • CN2 Connector: Load (Motor, Lamp, LED, DC-DC Converter)
  • CN3 Connector: Pin 1 VCC, Pin 2 Enable, Pin 3 Fault, Pin 4 PWM In, Pin 5 GND

Applications

  • PWM of High Current Resistive and Inductive Loads, Such as Heaters, LED, Lamps, Motors
  • Half-Bridge and Full-Bridge Motor Control
  • Synchronous Step-Down Switching Regulators
  • Three-Phase Brushless Motor Drive
  • High Current Transducer Drivers

Features

  • Supply Range 12V to 24V
  • Load up to 7Amps
  • Over Current Shutdown Approx. 7.5Amps
  • PWM Frequency Input Range 0 to 100Khz
  • PWM Duty Cycle 0 to 99%
  • D2 Power LED
  • Continuous Current Limit Protection
  • Auto Shutdown and Retry Capability
  • Built-In Gate Voltage Protection
  • Compatible with Current-Sensing MOSFETs
  • TTL/CMOS Input Levels
  • PCB Dimensions 69.22 x 55.88mm

Schematic

Parts List

NO.QNTY.REF.DESCMANUFACTURERSUPPLIERPART NO
12CN1,CN32 PIN BARRIER BLOCK PITCH 9.53MMTE CONNECTIVITYDIGIKEYA98481-ND
21CN25 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5318-ND
32C3,C70.1uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
41C210uF/35V SMD SIZE 1206MURATA/YAGEODIGIKEY
51C41000uF/35VILLINIOS DIGIKEY1572-1316-ND
61C50.01uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
72R4,C6DNP
81C80.33uF/35 SMD SIZE 1206MURATA/YAGEODIGIKEY
91D11N4148 SMDMICROCHIPDIGIKEY1086-15170-ND
101D2LED SMD SIZE 0805LITE ON INCDIGIKEY160-1427-1-ND
112Q1,Q2IRF3710INFINIONDIGIKEYIRF3710PBF-ND
122R1,R524E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
132R2,R30.05E 1% SMD SIZE 2512MURATA/YAGEODIGIKEY
141R63K3 5% SMD SIZE 1206MURATA/YAGEODIGIKEY
151R71K 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
161U1LT1158ANALOG DEVICEDIGIKEYLT1158CSW#TRPBFTR-ND
171C10.1uF/50V SMD SIZE 1206MURATA/YAGEODIGIKEY

Connections



Gerber View

Photos

Video

LT1158 Datasheet

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PCB

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