ISL78223 Datasheet, PDF (1/20 Pages) Intersil Corporation – ZVS Full-Bridge PWM Controller with Adjustable Synchronous Rectifier Control

ZVS Full-Bridge PWM Controller with Adjustable
Synchronous Rectifier Control
ISL78223
The ISL78223 is a high-performance zero-voltage switching
(ZVS) full-bridge PWM controller. 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.
Adding to the ISL78223’s feature set are average current
monitoring and soft-start. The average current signal may be
used for average current limiting, current sharing circuits and
average current mode control. Additionally, the ISL78223
supports both voltage- and current-mode control.
The ISL78223 features complemented PWM outputs for
synchronous rectifier (SR) control. The complemented outputs
may be dynamically advanced or delayed relative to the PWM
outputs using an external control voltage.
This advanced BiCMOS design features precision deadtime
and resonant delay control, and an oscillator adjustable to
2MHz operating frequency. Additionally, Multi-Pulse
Suppression ensures alternating output pulses at low duty
cycles where pulse skipping may occur.
The ISL78223 is both AEC - Q100 rated and fully TS16949
compliant. The ISL78223 is rated for the automotive
temperature range (-40°C to +105°C).
Features
• Adjustable resonant delay for ZVS operation
• Synchronous rectifier control outputs with adjustable
delay/advance
• Voltage- or current-mode control
• 3% current limit threshold
• Adjustable average current limit
• Adjustable deadtime control
• 175µA start-up current
• Supply UVLO
• Adjustable oscillator frequency up to 2MHz
• Internal over-temperature protection
• Buffered oscillator sawtooth output
• Fast current sense to output delay
• Adjustable cycle-by-cycle peak current limit
• 70ns leading edge blanking
• Multi-pulse suppression
• AEC - Q100 qualified
• Pb-free (RoHS compliant)
Applications
• ZVS full-bridge converters
• Telecom and datacom power
• Wireless base station power
• File server power
• Industrial power systems
January 2, 2013
FN7936.1
FIGURE 1. BOARD LAYOUT
1
10.0
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0
V_IN = 250V
V_IN = 350V
V_IN = 450V
V_O = 13.1V
20
40
60
80
100
LOAD (0-125A) (%)
FIGURE 2. EFFICIENCY vs LOAD
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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