參數(shù)資料
型號(hào): 3101M-E1
廠商: BCD Semiconductor Manufacturing Limited
英文描述: GREEN MODE PWM CONTROLLER
中文描述: 綠色模式PWM控制器
文件頁數(shù): 9/14頁
文件大?。?/td> 237K
代理商: 3101M-E1
GREEN MODE PWM CONTROLLER AP3101
Preliminary Datasheet
9
Apr. 2007 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
Typical Performance Characteristics (Continued)
Figure 10. Skip Level vs. Ambient Temperature
Figure 11. Oscillator Frequency vs. Timing Resistor
-40
-20
0
20
40
60
80
100
120
1.14
1.16
1.18
1.20
1.22
1.24
1.26
S
Ambient Temperature (
o
C)
12
15
18
21
24
27
30
33
36
39
42
30
45
60
75
90
105
120
135
O
Timing Resistor (k
)
Operation Description
The AP3101 is specially designed for off-line AC-DC
adapter and battery charger applications. It offers the
designer a cost effective solution with minimal
external components.
Oscillator
The oscillation frequency is programmed by the value
of resistor R1 connected from pin RI to ground. The
resistor will make a constant current source to deter-
mine the oscillation frequency by charging and dis-
charging an internal capacitor. The oscillation
frequency can be expressed as:
)
(
)
(
k
R
The recommended oscillation frequency is 50 to 100
kHz.
Start-up Current and Operating Current
The typical start-up current is only 30
μ
A. With such
a low start-up current, the start-up resistor may have a
very high resistance value even in 85V line voltage;
however, higher resistance will cause longer start-up
time. So we must select a proper start-up resistor and a
proper V
CC
hold-up capacitor. Operating current is
lowered to 3mA. It can reduce the requirement of V
CC
hold-up capacitor value and the power loss in AP3101.
Under-Voltage Lockout (UVLO)
An UVLO comparator is included in AP3101 to
detect the voltage on the VCC pin. It ensures AP3101
to draw adequate energy from hold-up capacitor during
power on. The turn-on threshold is 16V and the turn-
off threshold is 10V.
Current Sense Comparator and PWM Latch
AP3101 operates as a current mode controller, the
output switch conduction is initiated by every oscilla-
tor cycle and terminated when the peak inductor cur-
rent reaches the threshold level established by the FB
pin. The inductor current signal is converted to a volt-
age signal by inserting a referenced sense resistor RS
1690
kHz
f
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