AP3101M-E1 BCDSEMI [BCD Semiconductor Manufacturing Limited], AP3101M-E1 Datasheet - Page 9

• Manufacturer Part Number: AP3101M-E1
• Description: GREEN MODE PWM CONTROLLER
• Manufacturer: BCDSEMI [BCD Semiconductor Manufacturing Limited]

Typical Performance Characteristics (Continued)
Operation Description
adapter and battery charger applications. It offers the
designer a cost effective solution with minimal
external components.
Oscillator
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:
kHz.
Start-up Current and Operating Current
a low start-up current, the start-up resistor may have a
Apr. 2007 Rev. 1. 3
GREEN MODE PWM CONTROLLER
The AP3101 is specially designed for off-line AC-DC
The oscillation frequency is programmed by the value
The recommended oscillation frequency is 50 to 100
The typical start-up current is only 30µA. With such
f
Figure 10. Skip Level vs. Ambient Temperature
≈
1.26
1.24
1.22
1.20
1.18
1.16
1.14
R
-40
1690
( 1
k
Ω
-20
)
(
kHz
0
Ambient Temperature (
)
20
40
60
o
C)
80
100
120
9
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
lowered to 3mA. It can reduce the requirement of V
hold-up capacitor value and the power loss in AP3101.
Under-Voltage Lockout (UVLO)
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
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
AP3101 operates as a current mode controller, the
An UVLO comparator is included in AP3101 to
Figure 11. Oscillator Frequency vs. Timing Resistor
135
120
105
90
75
60
45
30
12
CC
BCD Semiconductor Manufacturing Limited
15
hold-up capacitor. Operating current is
18
21
Timing Resistor (k
24
Preliminary Datasheet
27
30
Ω
)
33
36
AP3101
39
42
CC