ISL6753

ZVS Full-Bridge PWM Controller

Product Status: Mass Production

OVERVIEW

The ISL6753 is a high-performance, low-pin-count alternative, zero-voltage switching (ZVS) full-bridge PWM controller. Like the ISL6551, it achieves ZVS operation by driving the upper bridge FETs at a fixed 50% duty cycle while the lower bridge FETS are trailing-edge modulated with adjustable resonant switching delays. Compared to the more familiar phase-shifted control method, this algorithm offers equivalent efficiency and improved overcurrent and lightload performance with less complexity in a lower pin count package.

This advanced BiCMOS design features low operating current, adjustable oscillator frequency up to 2MHz, adjustable soft-start, internal over temperature protection, precision deadtime and resonant delay control, and short propagation delays. Additionally, Multi-Pulse Suppression ensures alternating output pulses at low duty cycles where pulse skipping may occur.

KEY FEATURES

  • Adjustable Resonant Delay for ZVS Operation
  • Voltage- or Current-Mode Operation
  • 3% Current Limit Threshold
  • 175µA Startup Current
  • Supply UVLO
  • Adjustable Deadtime Control
  • Adjustable Soft-Start
  • Adjustable Oscillator Frequency Up to 2MHz
  • Tight Tolerance Error Amplifier Reference Over Line, Load, and Temperature
  • 5MHz GBWP Error Amplifier
  • Adjustable Cycle-by-Cycle Peak Current Limit
  • Fast Current Sense to Output Delay
  • 70ns Leading Edge Blanking
  • Multi-Pulse Suppression
  • Buffered Oscillator Sawtooth Output
  • Internal Over Temperature Protection
  • Pb-Free Plus Anneal Available and ELV, WEEE, RoHS Compliant

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6753
Basic Information
Production Status
Mass Production
iSim Model
YES
Topology
Zero-Voltage-Switching (ZVS)
Topology Characteristic
Full-Bridge ZVS
Control Mode
Voltage, Peak Current, or Average Current Mode
UVLO Rising (V)
8.75
UVLO Falling (V)
7
VBIAS (max) (V)
20
No-Load Operating Current
11 mA (typ), 15.5 mA (max)
# of PWM Outputs
4
FET Driver Output Current Max
10 mA
Max Duty Cycle (%)
99
Qualification Level
Standard
Can Sample
YES
Temperature Range
-40 to +105

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