Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700
General Description
The AP3700 is a green-mode pulse width modulation
(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 0.18Watt.
In normal operation, the AP3700 switches on and off at
a fixed switching frequency of 60 kHz. With a current
limit capability of 420mA, the AP3700 can directly
drive the emitter of high voltage NPN transistor or the
source of MOSFET. When output power falls below a
given level, the IC enters skip cycle mode to reduce
power consumption.
The AP3700 also features under-voltage lockout, over-
current and short circuit protections.
The AP3700 is available in TO-92 package.
Features
·
·
·
·
·
·
·
·
·
Current Mode Control with Skip Cycle Capability
Lower Operating Current: 0.45mA
Fixed Switching Frequency: 60 kHz
Frequency Dither for Low EMI:
±2.5kHz
Under-Voltage Lockout Protection
Over-Current Protection
Internal Short Circuit Protection
Higher Output Breakdown Voltage
Lower Total Cost Solution
Applications
·
·
Battery Chargers
Off-Line Power Supplies
TO-92
Figure 1. Package Types of AP3700
Jan. 2007 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700
Pin Configuration
Z Package
(TO-92)
3
2
1
OUT
GND
VCC
Figure 2. Pin Configuration of AP3700 (Top View)
Pin Description
Pin Number
TO-92
1
2
3
Pin Name
VCC
GND
OUT
Function
The power supply of the IC, and is generally connected to opto-coupler's emitter
Supply ground
The output pin, connected to the emitter of NPN transistor or the source of MOSFET
Jan. 2007 Rev. 1. 1
2
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700
Ordering Information
AP3700
Circuit Type
-
E1: Lead Free
TR: Ammo for TO-92
Blank: Bulk
Package
Z: TO-92
Package
TO-92
Switching Frequency
60kHz
Temperature Range
-40 to 85
o
C
Part Number
AP3700Z-E1
AP3700ZTR-E1
Marking ID
3700Z-E1
3700Z-E1
Packing Type
Bulk
Ammo
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage
Voltage at OUT
Output Current at OUT
Power Dissipation
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10s)
ESD (Machine Model)
Value
-0.3 to 6.0
-0.3 to 40
Internally limited
N/A
150
-65 to 150
300
200
Unit
V
V
A
W
o
C
o
C
o
C
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 Maximum Ratings" for extended periods
may affect device reliability.
Jan. 2007 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700
Electrical Characteristics
(V
CC
=4V, T
J
=25
o
C, unless otherwise specified.)
Parameter
UVLO SECTION
Start-up Voltage
Minimal Operating Voltage
V
TH (ST)
V
OPR
(Min)
I
ST
I
CC(OPR)
V
Z
R
VCC
F
SW
I
CC
=10mA
V
CC
=3.8 to 4.8V
50
6
V
CC
=4V
5.00
3.4
5.25
3.65
5.50
3.9
V
V
Symbol
Conditions
Min
Typ
Max
Unit
STANDBY CURRENT SECTION
Start-up Current
Operating Current
V
CC
Zener Voltage
Dynamic Impedance
INTERNAL OSCILLATOR
Switching Frequency
Frequency Dither
Temperature Stability
DRIVE OUTPUT SECTION
OUT Start-up Voltage
Short Circuit Threashold
Voltage
Rise Time
Fall Time
Maximum Duty Cycle
Minimum Duty Cycle
Driver OUT On-Resistance
Switch Off Current (OUT)
Effective Current Limit
OUT Current Coefficient
I
LIM
G
A
R
OUT
V
ST
V
SC
T
R
T
F
D
MAX
C
L
=1nF, 15Ω pull-up
C
L
=1nF, 15Ω pull-up
V
OPR
(Min) + 0.2V
V
CC
=V
TH (ST)
-0.2V
I
OUT
=0.06A
Driver off, V
OUT
=10V
V
CC
= V
OPR
+0.1V
420
-0.3
67
8.5
6
60
30
75
3
3
20
40
Ω
µA
mA
A/V
84
%
11
V
V
ns
60
75
kHz
kHz
%
0.22
0.45
6.3
18
0.4
0.7
V
kΩ
mA
±
2
±
2.5
5
±
3
8
Jan. 2007 Rev. 1. 1
5
BCD Semiconductor Manufacturing Limited
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