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PDF AP3720 Data sheet ( Hoja de datos )
| Número de pieza | AP3720 | |
| Descripción | CURRENT MODE PWM CONTROLLER | |
| Fabricantes | BCD Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP3720 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Preliminary Datasheet
CURRENT MODE PWM CONTROLLER FOR BJT
AP3720
General Description
The AP3720 is a low startup current, current mode
PWM controller with green-mode operation. The
PWM switching frequency at normal operation is 65k,
but when the output power drops below the
specifically level, the device enters the
frequency-drop mode and the typical operating
frequency is 20kHz (no audible noise). Additionally,
when the load drops to a very low level or zero, the
IC operates in so called ‘burst mode’ to minimize
switching loss.
The IC integrated a lot of functions such as the
Lead-Edge Blanking (LEB) of the current sensing,
internal slope compensation, line compensation, and
several protection features. The protection functions
include cycle-by-cycle current limit (OCP), VCC
over voltage protection (OVP), OTP and OLP.
The AP3720 is available in DIP-8 and SOIC-8
packages.
Features
• Low Startup Current (2.5µA) and Low
Operating Current (1.2mA)
• Off-line Converter Applied in Sub 25W Range
• Skip Cycle Mode Achieves Low Standby Power
(<200mW)
• Cycle-by-Cycle Power Limited
• Frequency-drop Mode
• Soft Start with 2ms
• Programmable Drive Current for BJT
• Leading Edge Blanking
• Pre-shutdown Decreases Turn-off Losses
• Reliable Protection:
Accurate OCP with Line Compensation
Short Circuit Protection
Over Voltage Protection for VCC
Hysteretic Thermal Shutdown Protection
Applications
• STB
• Cable Modem
• ADSL Modem
• DVD Recorder
Jan. 2013 Rev. 1. 1
DIP-8
SOIC-8
Figure 1. Package Types of AP3720
BCD Semiconductor Manufacturing Limited
1
1 page  
Preliminary Datasheet
CURRENT MODE PWM CONTROLLER FOR BJT
AP3720
Electrical Characteristics
VCC =15V, TA=25°C, unless otherwise specified.
Parameter
Conditions
Supply Voltage ( VCC Pin )
Startup Current
Operating Current
UVLO (on)
UVLO (off)
VCC OVP
VCC=15V
VFB=VCS=0V
PWM Section / Oscillator Section
Maximum Duty Cycle
Normal Frequency
Green Frequency
Frequency Switch Delay Time
VFB=3V
VFB=2V
From 65k to 20k
From 20k to 65k
Frequency Temperature Stability -40ºC to 85ºC
Frequency Voltage Stability
VCC=8V to 18V
Current Sense Section ( CS Pin )
Maximum CS Voltage
Line Compensation Coefficient
VLINE=0.95V
LEB Time
Soft Start Time
Feedback Input Section ( FB Pin )
The Ratio of FB to CS
Input Impedance
Source Current
GFB
RFB
IFB
Output Section ( Gate Pin )
Output Maximum Current
Output Sink Current
RBIAS=1M
VFB=VCS=0V
Protection Section
OLP Delay Time
Shutdown Temperature
VFB=5.1V
Min
18.5
7.1
67
60
0.983
250
2.5
7
-1
Typ
2.5
1.2
20
8
26.5
75
65
20
64
0
±5
1.5
1.032
4.6
350
2
3
10
-0.5
32
64
160
Max Unit
8 µA
2.5 mA
21.5 V
8.9 V
28.5 V
83 %
70 kHz
kHz
ms
ms
±8 %
3%
1.081
9.5
400
V
%
ns
ms
3.5 V/V
13 kΩ
mA
mA
0.5 mA
ms
ºC
Jan. 2013 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
5
5 Page 
Preliminary Datasheet
CURRENT MODE PWM CONTROLLER FOR BJT
AP3720
Mechanical Dimensions
DIP-8
Unit: mm(inch)
6°
3.710(0.146)
4.310(0.170) 4°
3.000(0.118)
3.600(0.142)
0.254(0.010)TYP
0.360(0.014)
0.560(0.022)
1.524(0.060) TYP
0.700(0.028)
7.620(0.300)TYP
5°
6°
3.200(0.126)
3.600(0.142)
4
0.510(0.020)MIN
2.540(0.100) TYP
0.130(0.005)MIN
0.204(0.008)
0.360(0.014)
8.200(0.323)
9.400(0.370)
R0.750(0.030)
Φ3.000(0.118)
Depth
0.100(0.004)
0.200(0.008)
9.000(0.354)
9.600(0.378)
6.200(0.244)
6.600(0.260)
Note: Eject hole, oriented hole and mold mark is optional.
Jan. 2013 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AP3720.PDF ] | |
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