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PDF AP3700 Data sheet ( Hoja de datos )
| Número de pieza | AP3700 | |
| Descripción | LOW POWER PWM CONTROLLER | |
| Fabricantes | BCD Semiconductor | |
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
General Description
Features
AP3700/A
The AP3700/A is a green-mode pulse width modula-
tion (PWM) controller. It is specially designed for low
power applications such as off-line battery chargers,
where the needs for low standby power, space saving
and low cost are all required. In a battery charger rated
5V/1A, the maximum standby power is only 0.18W.
In normal operation, the AP3700/A switches on and
off at a fixed switching frequency of 60 kHz. With a
current limit capability of 460mA for AP3700 and
500mA for AP3700A, the AP3700/A can directly
drive the emitter of high voltage NPN transistor. When
output power falls below a given level, the IC enters
skip cycle mode to reduce power consumption.
The AP3700/A also features under-voltage lockout,
over-current and short circuit protections.
· Current Mode Control with Skip Cycle Capability
· Lower Operating Current: 0.45mA
· Fixed Switching Frequency: 60 kHz
· Frequency Dithering for Low EMI: ±2.5kHz
· Under-Voltage Lockout Protection
· Over-Current Protection
· Internal Short Circuit Protection
· Higher Output Voltage at OUT Terminal
· Low Total Cost Solution
Applications
· Battery Chargers
· Off-Line Power Supplies
The AP3700/A is available in TO-92 package.
Mar. 2008 Rev. 1. 4
TO-92
(Bulk Packing)
TO-92
(Ammo Packing)
Figure 1. Package Types of AP3700/A
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700/A
Electrical Characteristics
(VCC=4V, TJ=25oC, unless otherwise specified.)
Parameter
Symbol
Conditions
UVLO SECTION
Start-up Voltage
VTH (ST)
Minimal Operating Voltage VOPR(min)
STANDBY CURRENT SECTION
Start-up Current (Note 3)
Operating Current
VCC Zener Voltage
Dynamic Impedance
INTERNAL OSCILLATOR
IST
ICC(OPR)
VZ
RVCC
VCC=4V
ICC=10mA
VCC=3.8 to 4.8V
Switching Frequency
Frequency Dither
FSW
Temperature Stability
DRIVE OUTPUT SECTION
OUT Start-up Voltage
Short Circuit Threashold
Voltage (Note 4)
VST
VSC
Min Typ Max Unit
5.00 5.25 5.50
3.4 3.65 3.9
V
V
0.22 0.4 mA
0.45 0.7
6 6.3
V
18 kΩ
50 60 75 kHz
±2 ±2.5 ±3 kHz
5 8%
8.5 11
6
V
V
Rise Time
Fall Time
Maximum Duty Cycle
Minimum Duty Cycle
Driver OUT On-Resistance
Switch Off Current (OUT)
Effective Current Limit
TR
TF
DMAX
ROUT
ILIM
CL=1nF, 15Ω pull-up
CL=1nF, 15Ω pull-up
VOPR(min) + 0.2V
VCC=VTH (ST)-0.2V
IOUT=0.06A
Driver off, VOUT=10V
For AP3700
VCC = VOPR+0.1V
For AP3700A
67
460
500
60
30
75
3
3
20
ns
84 %
Ω
40 µA
mA
OUT Current Coefficient
GA
-0.3 A/V
Note 3: AP3700/A is an emitter drive controller, the PWM controller will start up only when the voltage on the OUT pin rises
up to its threshould value.
Note 4: AP3700/A performs its short circuit function by shutdown the OUT pulse when the OUT pin voltage drops below its
short circuit threshold value.
Mar. 2008 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
5
5 Page 
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
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| PDF Descargar | [ Datasheet AP3700.PDF ] | |
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