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3700Z-E1 Datasheet

  • 3700Z-E1

  • LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER

  • BCDSEMI

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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700
General Description
The AP3700 is a green-mode pulse width modulation
(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 0.18Watt.
In normal operation, the AP3700 switches on and off at
a fixed switching frequency of 60 kHz. With a current
limit capability of 420mA, the AP3700 can directly
drive the emitter of high voltage NPN transistor or the
source of MOSFET. When output power falls below a
given level, the IC enters skip cycle mode to reduce
power consumption.
The AP3700 also features under-voltage lockout, over-
current and short circuit protections.
The AP3700 is available in TO-92 package.
Features
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Current Mode Control with Skip Cycle Capability
Lower Operating Current: 0.45mA
Fixed Switching Frequency: 60 kHz
Frequency Dither for Low EMI:
鹵2.5kHz
Under-Voltage Lockout Protection
Over-Current Protection
Internal Short Circuit Protection
Higher Output Breakdown Voltage
Lower Total Cost Solution
Applications
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Battery Chargers
Off-Line Power Supplies
TO-92
Figure 1. Package Types of AP3700
Jan. 2007 Rev. 1. 1
1
BCD Semiconductor Manufacturing Limited

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