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3844CP

Description
CURRENT MODE PWM CONTROLLER
File Size177KB,13 Pages
ManufacturerBCD Semi(Diodes)
Download Datasheet View All

3844CP Overview

CURRENT MODE PWM CONTROLLER

Data Sheet
CURRENT MODE PWM CONTROLLER
General Description
The AP3842C/3C/4C/5C are high performance fixed
frequency current-mode PWM controller series.
These integrated circuits are optimized for off-line and
DC-DC converter applications with minimum external
components. They feature under-voltage lockout
(UVLO) circuit with low start-up current, trimmed
oscillator for precise duty cycle control, current sense
comparator providing maximum current limiting and a
totem pole output stage for increasing output current.
In addition, these ICs also feature accurate protection
against over-temperature, over-current and maximal
output power.
The AP3842C and AP3844C have UVLO thresholds
of 16V(on) and 10V(off); The corresponding thresh-
olds for AP3843C and AP3845C are 8.4 V(on) and
7.6V(off).
The AP3842C and AP3843C can operate approaching
100% duty cycle; AP3844C and AP3845C can operate
from zero to 50% duty cycle.
These ICs are available in SOIC-8 and DIP-8 pack-
ages.
AP384XC
Features
·
·
·
·
·
·
·
·
Low Start-up Current: 50
µ
A
Robust V
REF
Line/Load Regulation
Low Line Regulation : 4mV
Low Load Regulation : 4mV
High Stability of Reference Voltage over a Full
Temperature Range: 0.2mV/
o
C
Operating Frequency up to 500KHz
High PWM Frequency Stability over a Full Tem-
perature Range: 2.5%
High PWM Frequency Stability under a Full Sup-
ply Voltage Range: 0.2%
Accurate Over-temperature Protection with Hys-
teresis
UVLO with Hysteresis
Applications
·
·
·
·
·
·
Off-line Converter
DC-DC Converter
Voltage Adapter
CRT Monitor Power Supply
Desktop Power Supply
DVD/STB Power Supply
SOIC-8
DIP-8
Figure 1. Package Types of AP3842C/3C/4C/5C
Sep. 2006 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
1
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