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3700AZ-E1

LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER

BCD Semiconductor 

Data Sheet

LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER

General Description

Features

AP3700/A

The AP3700/A is a green-mode pulse width modula-

tion (PWM) controller. It is specially designed for low

power applications such as off-line battery chargers,

where the needs for low standby power, space saving

and low cost are all required. In a battery charger rated

5V/1A, the maximum standby power is only 0.18W.

In normal operation, the AP3700/A switches on and

off at a fixed switching frequency of 60 kHz. With a

current limit capability of 460mA for AP3700 and

500mA for AP3700A, the AP3700/A can directly

drive the emitter of high voltage NPN transistor. When

output power falls below a given level, the IC enters

skip cycle mode to reduce power consumption.

The AP3700/A also features under-voltage lockout,

over-current and short circuit protections.

· Current Mode Control with Skip Cycle Capability

· Lower Operating Current: 0.45mA

· Fixed Switching Frequency: 60 kHz

· Frequency Dithering for Low EMI: ±2.5kHz

· Under-Voltage Lockout Protection

· Over-Current Protection

· Internal Short Circuit Protection

· Higher Output Voltage at OUT Terminal

· Low Total Cost Solution

Applications

· Battery Chargers

· Off-Line Power Supplies

The AP3700/A is available in TO-92 package.

Mar. 2008 Rev. 1. 4

TO-92

(Bulk Packing)

TO-92

(Ammo Packing)

Figure 1. Package Types of AP3700/A

BCD Semiconductor Manufacturing Limited

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