Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
General Description
The AP3700E 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/0.8A, the maximum standby power is only
0.18Watt.
In normal operation, the AP3700E switches on and off
at a fixed switching frequency of 60 kHz. With a cur-
rent limit capability of 460mA, the AP3700E can
directly drive the emitter of high voltage NPN transis-
tor. When output power falls below a given level, the
IC enters skip cycle mode to reduce power consump-
tion.
The AP3700E also features under-voltage lockout,
over-current and short circuit protections.
The AP3700E 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 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
TO-92
(Buck Packing)
TO-92
(Ammo Packing)
Figure 1. Package Types of AP3700E
May 2008 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Pin Configuration
Z Package
(TO-92)
3
2
1
OUT
GND
VCC
Figure 2. Pin Configuration of AP3700E (Top View)
Pin Description
Pin Number
1
2
3
Pin Name
VCC
GND
OUT
Supply ground
The output pin, connected to the emitter of NPN transistor or the source of MOSFET
Function
The power supply of the IC, and is generally connected to opto-coupler's emitter
May 2008 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Functional Block Diagram
VCC
1
VREF
REGULATOR
UVLO
COMPARATOR
3
SHORT CIRCUIT
COMPARATOR
OUT
_
+
_
+
TIMER
OSCILLATOR
VREF
CLAMP
COMPARATOR
SLOPE
COMPENSATION
+
_
+
+
BANDGAP
&
VREF
BIAS
DRIVER
PWM
CONTROL
_
PWM
COMPARATOR
GND
2
Figure 3. Functional Block Diagram of AP3700E
May 2008 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Ordering Information
AP3700
-
E1: Lead Free
G1: Green
TR: Ammo
Blank: Tube
Package
Z: TO-92
Packing
Type
Bulk
Ammo
Circuit Type
E: AP3700E
Package
Switching
Frequency
60kHz
Temperature
Range
-40 to 85
o
C
Part Number
Lead Free
AP3700EZ-E1
AP3700EZTR-E1
Green
AP3700EZ-G1
AP3700EZTR-G1
Marking ID
Lead Free
3700EZ-E1
3700EZ-E1
Green
3700EZ-G1
3700EZ-G1
TO-92
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green packages.
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage
Voltage at OUT (Note 2)
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
0.6
150
-65 to 150
300
200
Unit
V
V
A
W
o
o
C
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.
Note 2: The Breadown Voltage. The actual operating voltage can not be greater than the value listed here.
May 2008 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Electrical Characteristics
(V
CC
=4.5V, 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
-40 to 85
o
C
V
OUT(ON)
V
OUT(OFF)
T
R
T
F
D
MAX
R
OUT
I
LIM
G
A
C
L
=1nF, 15Ω pull-up
C
L
=1nF, 15Ω pull-up
V
OPR
(min) + 0.2V
I
OUT
=0.06A
Driver off, V
OUT
=10V
V
CC
= V
OPR
+0.1V
460
-0.3
67
5
I
CC
=10mA
V
CC
=3.8 to 4.8V
50
6
V
CC
=4.5V
5.5
3.6
5.75
3.8
5.95
4.0
V
V
Symbol
Conditions
Min
Typ
Max
Unit
STANDBY CURRENT SECTION
Start-up Current (Note 3)
Operating Current
V
CC
Zener Voltage
Dynamic Impedance
INTERNAL OSCILLATOR
Switching Frequency
Frequency dithering
Temperature Stability
DRIVE OUTPUT SECTION
OUT Turn-on Voltage
OUT Turn-off 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
9.5
5.5
60
30
75
3
3
20
40
Ω
μA
mA
A/V
84
%
12
6.5
V
V
ns
60
75
kHz
kHz
%
0.22
0.45
6.3
18
0.45
0.7
V
kΩ
mA
±
2
±
2.5
5
±
3
10
Note 3: AP3700E 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.
May 2008 Rev. 1. 1
5
BCD Semiconductor Manufacturing Limited
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