ISL6840_07 Datasheet, PDF (1/12 Pages) Intersil Corporation – Improved Industry Standard Single-Ended Current Mode PWM Controller

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Data Sheet
ISL6840, ISL6841, ISL6842,
ISL6843, ISL6844, ISL6845
April 16, 2007
FN9124.8
Improved Industry Standard Single-Ended
Current Mode PWM Controller
The ISL6840, ISL6841, ISL6842, ISL6843, ISL6844,
ISL6845 family of adjustable frequency, low power, pulse
width modulating (PWM) current mode controllers is
designed for a wide range of power conversion applications
including boost, flyback, and isolated output configurations.
Peak current mode control effectively handles power
transients and provides inherent overcurrent protection.
This advanced BiCMOS design is pin compatible with the
industry standard 384x family of controllers and offers
significantly improved performance. Features include low
operating current, 60μA start-up current, adjustable
operating frequency to 2MHz, and high peak current drive
capability with 20ns rise and fall times.
PART NUMBER
ISL6840
ISL6841
ISL6842
ISL6843
ISL6844
ISL6845
RISING UVLO
7.0
7.0
14.4V
8.4V
14.4V
8.4V
MAX. DUTY CYCLE
100%
50%
100%
100%
50%
50%
Features
• 1A MOSFET gate driver
• 60μA startup current, 100μA maximum
• 25ns propagation delay current sense to output
• Fast transient response with peak current mode control
• Adjustable switching frequency to 2MHz
• 20ns rise and fall times with 1nF output load
• Trimmed timing capacitor discharge current for accurate
deadtime/maximum duty cycle control
• High bandwidth error amplifier
• Tight tolerance voltage reference over line, load, and
temperature
• Tight tolerance current limit threshold
• Pb-free plus anneal available (RoHS Compliant)
Applications
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
• PC Power Supplies
• Isolated Buck and Flyback Regulators
• Boost Regulators
Pinout
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
8 LD SOIC, MSOP
TOP VIEW
COMP 1
FB 2
CS 3
RTCT 4
8 VREF
7 VDD
6 OUT
5 GND
8 LD DFN
TOP VIEW
COMP ₁
FB 2
CS 3
RTCT 4
8 ^VREF
7 VDD
6 OUT
5 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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