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| 型號(hào)： | 3700Z-E1 |
| 廠商： | BCD Semiconductor Manufacturing Limited |
| 英文描述： | LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER |
| 中文描述： | 低功率PWM控制器離線電池充電器 |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 197K |
| 代理商： | 3700Z-E1 |
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700
Data Sheet
7
Jan. 2007 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
Function Description
1. Startup Circuit
Figure 3 is the functional block diagram of AP3700,
and there are 3 external pins: the VCC pin, the OUT
pin and GND pin. In typical application shown by
Figure 10, the VCC pin is used for both bias supply
and feedback control. The OUT pin directly drives
external NPN transistor or MOSFET, and also
provides initial bias power for UVLO comparator.
When the IC works in PWM mode, the auxiliary
winding will supply the V
CC
enough operating
current.
Figure 8 shows the start-up sequence of the V
CC
and
the V
OUT
.
2. V
CC
/Feedback Control
An opto-coupler and secondary constant voltage/
current controller consists of voltage feedback
network. When load is heavy, the voltage on VCC will
be lower to enlarge duty cycle; on the contrary, if load
drops, the voltage on VCC will rise to reduce duty
cycle.
3. Frequency Dither
Frequency dither is performed by periodically
spreading a single switching frequency into adjacent
frequency band, so the peak energy is spread. This
technique can improve EMI by reducing both quasi-
peak and average EMI emissions.
AP3700 has reference switching frequency of 60 kHz,
and its frequency deviation is
±
2.5kHz in period of
2ms. Figure 9 shows the frequency dither influence to
the waveform .
4. Current Limit Control
The AP3700 employs current mode control to
improve transient response and voltage stability. In
Figure 10, the external inductor current through the
OUT pin is converted to a voltage by an internal
resistor, and this voltage will participate to control
duty cycle and peak inductor current.
CH1: V
CC
CH2: OUT
Figure 8. Start-up Sequence of V
CC
and V
OUT
Figure 9. Frequency Dither Influences
the Swithcing Cycle
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