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Part: ISL6729
Category:
Description: Low-cost Single-ended Current-mode PWM For Microcontroller Based Power Converters
Company: Intersil Corporation
Datasheet: Download ISL6729 datasheet File size : 330 kB
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Datasheet text preview:
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ISL6729
D a ta Sheet J u l y 2004 FN9152.1
Low-Cost Single-Ended Current-Mode PWM for Microcontroller Based Power Converters
The ISL6729 pulse width modulating (PWM) current mode controller is designed for power conversion applications that are based on a microcontroller or other device which can generate a digital clock signal at the desired switching frequency. Similar to the ISL684x family of products, the ISL6729 provides the basic current mode PWM control features, but eliminates the error amplifier, the oscillator, and the reference. An external clock signal applied to the oscillator input provides the time base and sets the maximum duty cycle. The reduced feature set is ideal for those applications where a microcontroller is available to provide the monitor and control functions. The analog PWM provides the cycle by cycle peak current mode control, leaving the monitor and control overhead to the microcontroller.
Features
· 5V Operation · 1A MOSFET gate driver · 400µA startup current · 30ns propagation delay current sense to output · Fast transient response with peak current mode control · Switching frequency to 2MHz · 20ns rise and fall times with 1nF output load · Maximum Duty Cycle Determined by Clock Input Duty Cycle · Tight tolerance current limit threshold · Pb-free available
Applications
· Telecom and Datacom Power · Wireless Base Station Power
Ordering Information
PART NUMBER ISL6729 IB ISL6729IBZ (See Note) ISL6729 IU ISL6729 IUZ (See Note) TEMP. RANGE (°C) -40 to 105 -40 to 105 -40 to 105 -40 to 105 PACKAGE 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld MSOP 8 Ld MSOP (Pb-free) PKG. DWG. # M8.15 M8.15 M8.118 M8.118
· File Server Power · Industrial Power Systems · PC Power Supplies · Isolated Buck and Flyback Regulators · Boost Regulators
Pinout
ISL6729 (8-PIN SOIC, MSOP) TOP VIEW
COMP N/C CS C LK S 1 2 3 4 8 7 6 5 N/C VDD OUT GND
Add -T to part number for Tape and Reel packaging. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is 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-020B.
PART NUMBER ISL6729
RISING UVLO 4 . 7 5V
MAX. DUTY CYCLE 100%
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2004 All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
Functional Block Diagram
V DD START/STOP UV COMPARATOR VDDOK + -
2
BG GND CS COMP CLK
+ -
100mV
+ -
PWM COMPARATOR
+ 2R R
OUT
ISL6729
1.1V CLA M P
SQ RQ
Typical Application - Interleaved Multi-Phase Isolated Converter
VOLTAGE FEEDBACK 5V 1 CO M P 2 8 POWER STAGE ISOLATION
ERROR AMPLIFIER
VDD 7 OUT 6
3
CLOCK 1 CLOCK 2 MICROCONTROLLER CLOCK 3
3 CS
VOUT
4 CLK GND 5 ISL6729
CURRENT FEEDBACK
1 CO M P 2 3 CS
8 POWER STAGE
VDD 7 OUT 6
ISL6729
4 CLK GND 5 ISL6729
CURRENT FEEDBACK
1 CO M P 2
8 POWER STAGE
VDD 7
3 CS OUT 6 4 CLK GND 5 ISL6729
CURRENT FEEDBACK
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