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Intersil Electronic Components Datasheet

ISL8843 Datasheet

Industry Standard Single-Ended Current Mode PWM Controller

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ISL8843 pdf
®
Data Sheet
January 3, 2006
ISL8843
FN9238.1
Industry Standard Single-Ended Current
Mode PWM Controller
The ISL8843 is an industry standard drop-in replacement for
the popular 28C43 and 18C43 PWM controllers suitable for
a wide range of power conversion applications including
boost, flyback, and isolated output configurations. Its fast
signal propagation and output switching characteristics
make this an ideal product for existing and new designs.
Features include 30V operation, low operating current, 90µA
start-up current, adjustable operating frequency to 2MHz,
and high peak current drive capability with 20ns rise and fall
times.
PART NUMBER
ISL8843
RISING UVLO
8.4V
MAX. DUTY CYCLE
100%
Ordering Information
PART
NUMBER
PART
TEMP.
PKG.
MARKING RANGE (°C) PACKAGE DWG. #
ISL8843ABZ 8843 ABZ
(See Note)
-40 to 105 8 Ld SOIC M8.15
(Pb-free)
ISL8843AUZ 8843Z
(See Note)
-40 to 105 8 Ld MSOP M8.118
(Pb-free)
ISL8843MBZ 8843 MBZ
(See Note)
-55 to 125 8 Ld SOIC M8.15
(Pb-free)
ISL8843MUZ 843MZ
(See Note)
-55 to 125 8 Ld MSOP M8.118
(Pb-free)
Add -T to part number for Tape and Reel packaging.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
Features
• 1A MOSFET gate driver
• 90µA start-up current, 125µA maximum
• 35ns propagation delay current sense to output
• Fast transient response with peak current mode control
• 30V operation
• 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
• 1.5MHz bandwidth error amplifier
• Tight tolerance voltage reference over line, load, and
temperature
• ±3% current limit threshold
• Pb-free plus anneal available and ELV, WEEE, 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
ISL8843
(8 LD SOIC, MSOP)
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.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2005, 2006 All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.


Intersil Electronic Components Datasheet

ISL8843 Datasheet

Industry Standard Single-Ended Current Mode PWM Controller

No Preview Available !

ISL8843 pdf
Functional Block Diagram
VDD
GND
START/STOP
UV COMPARATOR
+ VDD OK
-
+-
2.5V
A
A=0.5
VREF
5.00 V
ENABLE
VREF FAULT
-
+
VREF
UV COMPARATOR
4.65V 4.80V
PWM
COMPARATOR
CS +
100mV
-
5%
FB
COMP
+
-
ERROR
AMPLIFIER
2R
VF Total = 1.15V
R
1.1V 3%
CLAMP
VREF
100K
2.9V
1.0V
100 nS
FALLING EDGE
DELAY
150K
RTCT
ON
OSCILLATOR
COMPARATOR
< 10nS
-
+ CLOCK
8.4mA
ON
SQ
RQ
RESET
DOMINANT
36K
VREF
OUT


Part Number ISL8843
Description Industry Standard Single-Ended Current Mode PWM Controller
Maker Intersil Corporation
Total Page 12 Pages
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