DATASHEET
ISL6752
ZVS Full-Bridge Current-Mode PWM with Adjustable Synchronous Rectifier
Control
The
ISL6752
is a high-performance, low-pin count alternative
Zero-Voltage Switching (ZVS) full-bridge PWM controller. Like
Intersil’s 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 light load performance with less complexity in a
lower pin count package.
The ISL6752 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 dead time
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.
FN9181
Rev 4.00
August 1, 2016
Features
• Adjustable resonant delay for ZVS operation
• Synchronous rectifier control outputs with adjustable
delay/advance
• Current-mode control
• 3% current limit threshold
• Adjustable dead time 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
• Pb-free (RoHS compliant)
Related Literature
•
AN1262,
“Designing with the ISL6752, ISL6753 ZVS
Full-Bridge Controllers”
•
AN1603,
“ISL6752/54EVAL1Z ZVS DC/DC Power Supply
with Synchronous Rectifiers User Guide”
•
AN1619,
“Designing with ISL6752DBEVAL1Z and
ISL6754DBEVAL1Z Control Cards”
Applications
• ZVS full-bridge converters
• Telecom and datacom power
• Wireless base station power
• File server power
• Industrial power systems
Pin Configuration
ISL6752
(16 LD QSOP)
TOP VIEW
VADJ
1
16 VDD
15 OUTLL
14 OUTLR
13 OUTUL
12 OUTUR
11 OUTLLN
10 OUTLRN
9 GND
VREF 2
VERR 3
CTBUF 4
RTD 5
RESDEL 6
CT 7
CS 8
FN9181 Rev 4.00
August 1, 2016
Page 1 of 18
ISL6752
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL6752AAZA
ISL6752/54EVAL1Z
ISL6752DBEVAL1Z
NOTES:
1. Add “T” suffix for 2.5k unit Tape and Reel options. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL6752.
For more information on MSL, please see tech brief
TB363
PART MARKING
ISL 6752AAZ
Evaluation Board
Evaluation Board
TEMP. RANGE (°C)
-40 to +105
PACKAGE
(RoHS COMPLIANT)
16 Ld QSOP
PKG. DWG. #
M16.15A
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PARAMETERS
Topology
Topology Characteristic
Control Mode
UVLO Rising (V)
UVLO Falling (V)
V
BIAS
(maximum)
No-Load Operating
Current
# of PWM Outputs
FET Driver I
OUT
(maximum)
ISL6754
Zero-Voltage Switching (ZVS)
Full-bridge ZVS
Peak current-mode or voltage
mode
8.75V
7V
20V
11mA (typica), 15.5mA
(maximum)
6
10mA
ISL6753
Zero-Voltage Switching (ZVS)
Full-bridge ZVS
Peak current-mode or voltage
mode
8.75V
7V
20V
11mA (typical), 15.5mA
(maximum)
4
10mA
99
ISL6752
Zero-Voltage Switching
(ZVS)
Full-bridge ZVS
Peak current-mode
8.75V
7V
20V
11mA (typical), 15.5mA
(maximum)
6
10mA
99
ISL6551
Zero-Voltage-Switching
(ZVS)
Full-bridge ZVS
Peak current-mode
9.6V
8.6V
16V
13mA
6
1A
99
Maximum Duty Cycle (%) 99
FN9181 Rev 4.00
August 1, 2016
Page 2 of 18
stm32/stm8
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