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Renesas Electronics Components Datasheet

ISL6755 Datasheet

ZVS Full-Bridge PWM Controller

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ISL6755
NOT RECOMMENDED FOR NEW DESIGNS
NO RECOMMENDED REPLACEMENT
contact our Technical Support Center at
1-888-INTERSIL or www.intersil.com/tsc
ZVS Full-Bridge PWM Controller with Average Current Limit
DATASHEET
FN6442
Rev.1.00
September 29, 2008
The ISL6755 is a high-performance extension of the Intersil
family of full-bridge ZVS controllers. Like the ISL6753, 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 ISL6753’s feature set is average current
monitoring. The signal may be used for average current
limiting, current sharing circuits and average current mode
control.
This advanced BiCMOS design features low operating
current, adjustable oscillator frequency up to 2MHz,
adjustable soft-start, 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.
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL6755AAZA* 6755 AAZ -40 to +105 20 Ld QSOP M20.15
*Add -T suffix to part number for tape and reel packaging
NOTE: 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.
Pinout
ISL6755
(20 LD QSOP)
TOP VIEW
VERR 1
CTBUF 2
RTD 3
RESDEL 4
CT 5
FB2 6
FB1 7
RAMP 8
CS 9
IOUT 10
20 VREF
19 SS
18 VDD
17 OUTLL
16 OUTLR
15 OUTUL
14 OUTUR
13 N/C
12 GND
11 GND
Features
• Adjustable Resonant Delay for ZVS Operation
• Voltage- or Current-Mode Operation
• 3% Current Limit Threshold
• Adjustable Average Current Limit
• 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 (RoHS Compliant)
Applications
• ZVS Full-Bridge Converters
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
FN6442 Rev.1.00
September 29, 2008
Page 1 of 17


Renesas Electronics Components Datasheet

ISL6755 Datasheet

ZVS Full-Bridge PWM Controller

No Preview Available !

Functional Block Diagram
VDD
GND
VREF
RESDEL
IOUT
UVLO
OVER-
TEMPERATURE
PROTECTION
4X
VREF
CT
RTD
CTBUF
SS
OSCILLATOR
SAMPLE
AND
HOLD
VREF
50%
PWM
STEERING
LOGIC
PWM
+
- 1.00V
OVER CURRENT
COMPARATOR
+70 nS
LEADING
EDGE
BLANKING
VDD
OUTUL
OUTUR
OUTLL
OUTLR
CS
PWM
COMPARATOR
+
-
80mV
0.33
SOFTSTART
CONTROL
VREF
1 mA
RAMP
+ 0.6V
-
+
-
VERR
FB1
FB2


Part Number ISL6755
Description ZVS Full-Bridge PWM Controller
Maker Renesas
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ISL6755 Datasheet PDF






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