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AP3842C

CURRENT MODE PWM CONTROLLER

BCD Semiconductor 

Data Sheet

CURRENT MODE PWM CONTROLLER

General Description

Features

AP384XC

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).

· Low Start-up Current: 50µA

· Robust VREF Line/Load Regulation

Low Line Regulation : 4mV

Low Load Regulation : 4mV

· High Stability of Reference Voltage over a Full

Temperature Range: 0.2mV/ oC

· 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

The AP3842C and AP3843C can operate approaching · Off-line Converter

100% duty cycle; AP3844C and AP3845C can operate · DC-DC Converter

from zero to 50% duty cycle.

· Voltage Adapter

· CRT Monitor Power Supply

These ICs are available in SOIC-8 and DIP-8 pack- · Desktop Power Supply

ages.

· DVD/STB Power Supply

SOIC-8

DIP-8

Sep. 2006 Rev. 1. 1

Figure 1. Package Types of AP3842C/3C/4C/5C

BCD Semiconductor Manufacturing Limited

1

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