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PDF AP3102L Data sheet ( Hoja de datos )
| Número de pieza | AP3102L | |
| Descripción | GREEN MODE PWM CONTROLLER | |
| Fabricantes | BCD | |
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Preliminary Datasheet
GREEN MODE PWM CONTROLLER
General Description
Features
AP3102/V/L
The AP3102/V/L series is a green-mode PWM control-
ler with low start-up current. At normal operation, the
switching frequency is externally programmable and
trimmed to tight range, the frequency dithering
technique is also equipped to improve the EMI
performance. When the load is very low or zero, the IC
enters green mode and skip mode to minimize switch-
ing loss. In skip mode, the PWM switching frequency
is about 20kHz to avoid the audible noise and reduce
the standby loss.
The AP3102/V/L series features a lot of functions such
as the Leading-Edge Blanking (LEB) of the current
sensing, internal slope compensation, line compensa-
tion, and several protection functions including cycle-
by-cycle current limit (OCP), over voltage protection
(VCC or line voltage), OTP, OLP and brownout pro-
tection.
The AP3102/V/L series provides 3 different versions
with optional protection functions. AP3102 has exter-
nal trigger latch shutdown only (VOVP and OLP are
auto recoverable). AP3102V supports both VOVP and
external latch shutdown. AP3102L provides latch shut-
down control for VOVP, OLP and external trigger.
This IC is available in SOIC-8 and DIP-8 packages.
· Bi-CMOS Process with Excellent Performance
· Very Low Start-up Current: 5µA typical
· Current Mode Control
· Non-audible-noise Green Mode Control
· Frequency Foldback for High Average Efficiency
· Internal Slope Compensation
· Programmable Brownout Protection
· Programmable Line Compensation
· Useful Pin Fault Protection:
SENSE Pin Floating
RI Pin Short to Ground
RI Pin Floating
· Smart Latch/Auto-recoverable Protection Option
· Comprehensive Protection Feature:
VCC Over Voltage Protection (VOVP)
Line Over Voltage Protection (LOVP)
Over Temperature Protection (OTP)
Over Load Protection (OLP)
· Internal Soft Start Function During Start-up
· 500mA Gate Output Current Capability
Applications
· Switching AC-DC Adapter
· LCD Monitor/TV Power
· Open Frame Switching Power Supply
Jan. 2013 Rev. 1. 4
SOIC-8
DIP-8
Figure 1. Package Types of AP3102/V/L
BCD Semiconductor Manufacturing Limited
1
1 page  
GREEN MODE PWM CONTROLLER
Absolute Maximum Ratings (Note 1)
Preliminary Datasheet
AP3102/V/L
Parameter
Power Supply Voltage
Gate Output Current
Input Voltage to FB, SENSE pin
Input Voltage to RI, ADJ pin
Symbol
VCC
IO
VFB, VSENSE
VRI, VADJ
Thermal Resistance Junction to Ambient
θJA
Power Dissipation and Thermal Charac-
teristic, SENSE at TA<25oC
Operating Junction Temperature
Storage Temperature Range
ESD (Human Body Model)
ESD (Machine Model)
PD
TJ
TSTG
Value
30
500
-0.3 to 7
-0.3 to 7
DIP-8
SOIC-8
DIP-8
SOIC-8
-40 to150
150
2500
250
83
186
1359
550
Unit
V
mA
V
V
oC/W
mW
oC
oC
V
V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Max-
imum Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Supply Voltage
Ambient Operating Temperature Range
Symbol
VCC
TA
Min
10
-40
Max
25
85
Unit
V
oC
Jan. 2013 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
5
5 Page 
Preliminary Datasheet
GREEN MODE PWM CONTROLLER
AP3102/V/L
Operation Description
The AP3102/V/L is specifically designed for off-line
AC-DC power supply used in LCD monitor, notebook
adapter and battery charger applications. It offers a cost
effective solution with versatile protection functions
for system designer.
Start-up Current and UVLO
The start-up current of AP3102/V/L is optimized to
realize ultra low current (5µA typical) so that VCC
capacitor can be charged more quickly. The direct
benefit of low start-up current is the availability of
using large start-up resistor, which minimizes the
resistor power loss for high voltage AC input.
relation between peak inductor current (IPK) and VFB
is:
I PK = (VFB − 0.9) / 3RS
Abnormal operating conditions occur when the power
supply output is overloaded or the output voltage
sensing is lost. Under these conditions, the current
sense comparator threshold will be internally clamped
to a value related to the value of VBOK. As VBOK value
is proportional to the input line voltage, the constant
over load protection can be achieved by compensating
the delay time effect from the input line. The
maximum peak switch current is:
An UVLO comparator is included in AP3102/V/L to
detect the voltage on the VCC pin. It ensures AP3102/
V/L to draw adequate energy from hold-up capacitor
during power on. The turn-on threshold is 16V and the
turn-off threshold is 10V.
Oscillator
The oscillation frequency is programmed by the value
of resistor R8, connected from pin RI to ground. The
resistor will make a constant current source to
determine the oscillation frequency by charging and
discharging an internal capacitor.
The oscillation frequency can be expressed as:
I PK (MAX ) = (0.85 − 0.055×VBOK ) / RS
Leading-edge Blanking
A narrow spike on the leading edge of the current
waveform can usually be observed when the power
MOSFET is turned on. A 250ns leading-edge blank is
built-in to prevent the false-triggering caused by the
turn-on spike. During this period, the current limit
comparator is disabled and the gate driver can not be
switched off. A resistor is usually connected to the
current sense pin to avoid the PCB trace interference
and it also can adjust the inductor peak current tinily by
the resistance. Of course, adding a RC filter to CS pin
is better to attenuate any unexpected noise.
f
≈
1720
R8(kΩ)
(kHz)
The recommended oscillation frequency is 40 to 130
kHz from the EMI consideration.
Built-in Slope Compensation
It is well known that a continuous current mode SMPS
may become unstable when the duty cycle exceeds
50%. The built-in slope compensation can improve the
stability, so there is no need for design engineer to
spend much time on that.
Current Sense Comparator and PWM
Latch
AP3102/V/L operates as a current mode controller; the
output switch conduction is initiated by every
oscillator cycle and terminated when the peak inductor
current reaches the threshold level established by the
FB pin. The inductor current signal is converted to a
voltage signal by inserting a reference sense resistor
RS. The inductor current under normal operating
conditions is controlled by the voltage at FB pin, the
Jan. 2013 Rev. 1. 4
FB Pin and Short Circuit Protection
This pin is normally connected to the opt-coupler and
always paralleled with a capacitor for loop
compensation. When the voltage at this pin is great
than 4.2V (such as output short to ground or the opt-
coupler is broken) and lasts for about 35ms, the IC will
enter the protection mode. For AP3102, the system will
enter hiccup mode to wait the VCC decreasing to low
UVLO level, then the IC will try to restart until the
failure removed. For AP3102V, the IC will be latched
unless unplugging the AC socket. Moreover, if the
BCD Semiconductor Manufacturing Limited
11
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| PDF Descargar | [ Datasheet AP3102L.PDF ] | |
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