BCD AP3700EZTR-G1 Low power pwm controller for off-line battery charger Datasheet

Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
General Description
Features
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 current limit capability of 460mA, the AP3700E 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.
AP3700E
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 AP3700E also features under-voltage lockout,
over-current and short circuit protections.
The AP3700E is available in TO-92 package.
TO-92
(Buck Packing)
TO-92
(Ammo Packing)
Figure 1. Package Types of AP3700E
May 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Pin Configuration
Z Package
(TO-92)
3
OUT
2
GND
1
VCC
Figure 2. Pin Configuration of AP3700E (Top View)
Pin Description
Pin Number
Pin Name
Function
1
VCC
2
GND
Supply ground
3
OUT
The output pin, connected to the emitter of NPN transistor or the source of MOSFET
The power supply of the IC, and is generally connected to opto-coupler's emitter
May 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Functional Block Diagram
VCC
1
3
REGULATOR
VREF
_
UVLO
COMPARATOR
SHORT CIRCUIT
COMPARATOR
_
+
+
_
OSCILLATOR
SLOPE
COMPENSATION
+
+
BANDGAP
&
VREF
BIAS
VREF
+
TIMER
CLAMP
COMPARATOR
OUT
DRIVER
PWM
CONTROL
_
PWM
COMPARATOR
GND
2
Figure 3. Functional Block Diagram of AP3700E
May 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Ordering Information
AP3700
E1: Lead Free
G1: Green
Circuit Type
TR: Ammo
Blank: Tube
Package
Z: TO-92
E: AP3700E
Package
Switching
Frequency
Temperature
Range
60kHz
-40 to 85oC
TO-92
Part Number
Lead Free
Packing
Type
Marking ID
Green
Lead Free
Green
AP3700EZ-E1
AP3700EZ-G1
3700EZ-E1
3700EZ-G1
Bulk
AP3700EZTR-E1
AP3700EZTR-G1
3700EZ-E1
3700EZ-G1
Ammo
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
Value
Unit
Supply Voltage
-0.3 to 6.0
V
Voltage at OUT (Note 2)
-0.3 to 40
V
Output Current at OUT
Internally limited
A
Power Dissipation
0.6
W
Operating Junction Temperature
150
o
C
-65 to 150
o
C
Storage Temperature
Lead Temperature (Soldering, 10s)
300
oC
ESD (Machine Model)
200
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
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Electrical Characteristics
(VCC=4.5V, TJ=25oC, unless otherwise specified.)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
VTH (ST)
5.5
5.75
5.95
V
VOPR(min)
3.6
3.8
4.0
V
0.22
0.45
0.45
0.7
UVLO SECTION
Start-up Voltage
Minimal Operating Voltage
STANDBY CURRENT SECTION
Start-up Current (Note 3)
IST
Operating Current
ICC(OPR)
VCC Zener Voltage
VZ
Dynamic Impedance
RVCC
VCC=4.5V
ICC=10mA
6
VCC=3.8 to 4.8V
mA
6.3
V
18
kΩ
INTERNAL OSCILLATOR
Switching Frequency
fSW
Frequency dithering
Temperature Stability
-40 to
85o
50
60
75
kHz
±2
±2.5
±3
kHz
5
10
%
9.5
12
V
5.5
6.5
V
C
DRIVE OUTPUT SECTION
OUT Turn-on Voltage
VOUT(ON)
OUT Turn-off Voltage
VOUT(OFF)
5
Rise Time
TR
CL=1nF, 15Ω pull-up
60
Fall Time
TF
CL=1nF, 15Ω pull-up
30
Maximum Duty Cycle
DMAX
VOPR(min) + 0.2V
67
Minimum Duty Cycle
Driver OUT On-Resistance
OUT Current Coefficient
84
%
3
ROUT
Switch Off Current (OUT)
Effective Current Limit
75
ns
ILIM
IOUT=0.06A
3
Driver off, VOUT=10V
20
VCC = VOPR+0.1V
460
μA
mA
-0.3
GA
Ω
40
A/V
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
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Typical Performance Characteristics
300
0.60
0.58
280
Start-up Current (μA)
operating current(mA)
0.56
0.54
0.52
0.50
0.48
260
240
220
0.46
-40
-20
0
20
40
60
80
100
200
-40 -25 -10
120
5
20
35
50
65
80
95 110 125
o
Ambient Temperature ( C)
o
Ambient Temperature ( C)
Figure 4. Operating Current vs. Ambient Temperature
Figure 5. Start-up Current vs. Ambient Temperature
70
500
69
400
67
66
Start-up Current (μA)
Switching Frequency (kHZ)
68
65
64
63
62
61
60
59
300
200
100
58
57
56
55
-40
0
-20
0
20
40
60
80
100
120
o
1
2
3
4
5
VCC Voltage (V)
Ambient Temperature ( C)
Figure 6. Switching Frequency vs. Ambient Temperature
May 2008 Rev. 1. 1
Figure 7. Start-up Current vs. VCC Voltage
BCD Semiconductor Manufacturing Limited
6
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Typical Performance Characteristics (Continued)
540
Current limit(mA)
520
500
480
460
440
420
400
-40
-20
0
20
40
60
80
100
120
o
Ambient Temperature ( C)
Figure 8. Current Limit vs. Ambient Temperature
May 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Function Description
1. Startup Circuit
Figure 3 is the functional block diagram of AP3700E,
and there are 3 external pins: the VCC pin, the OUT
pin and GND pin. In typical application shown by
Figure 10, the VCC pin is used for both bias supply
and feedback control. The OUT pin directly drives
external NPN transistor or MOSFET, and also
provides initial bias power for UVLO comparator.
When the IC works in PWM mode, the auxiliary
winding will supply the VCC enough operating
current.
Figure 9 shows the start-up sequence of the VCC and
the VOUT.
Figure 10. Frequency Dithering Influences
the Swithcing Cycle
AP3700E has reference switching frequency of 60
kHz, and its frequency deviation is ±2.5kHz in period
of 2ms. Figure 10 shows the frequency dithering influence to the waveform .
CH1: VCC
CH2: OUT
4. Current Limit Control
The AP3700E employs current mode control to
improve transient response and voltage stability. In
Figure 11, the external inductor current through the
OUT pin is converted to a voltage by an internal
resistor, and this voltage will participate to control
duty cycle and peak inductor current.
Figure 9. Start-up Sequence of VCC and VOUT
2. VCC/Feedback Control
An opto-coupler and secondary constant voltage/
current controller consists of voltage feedback
network. When load is heavy, the voltage on VCC will
be lower to enlarge duty cycle; on the contrary, if load
drops, the voltage on VCC will rise to reduce duty
cycle.
3. Frequency Dithering
Frequency dithering is performed by periodically
spreading a single switching frequency into adjacent
frequency band, so the peak energy is spread. This
technique can improve EMI by reducing both quasipeak and average EMI emissions.
May 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Typical Application
Bridge D1-D4
1N4007*4
J1
AC 85-264V
L1
330μ
+ C1
4.7μ
C2
4.7μ
R2
R4
1.5M 100k
+
T1
EE16
L2
5.5μ
C9
470μ
C11
470μ
+
C3
2200p
+
D9
APD240
D5
FR107
R15
2k
D8
1N4148
R5
4.7
Z1
12V
C8
0.1μ
R9
100k
U3
PC817
D6
1N4148
R13
6.2k
Rs
0.25
C10
47μ
D7
1N4148
Q1
APT13003
5V/0.8A
+
R1
10/1W
R8
200
C7
2.2n
R6
200
3
R7
200
OUT
+ C4
10μ
VCC
GND
2
U1
AP3700E
1
3
C5
0.47μ
C6
6.8n
6
R10
22k
cc
VVOUT
VCTRL
1
VCC
VSENSE
5
GND
2
R11
510
R12
100
4
ICTRL
U2
AP4313
Figure 11. 5V/0.8A Output for Battery Charger of Mobile Phone
May 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Mechanical Dimensions
TO-92 (Bulk Packing)
Unit: mm(inch)
1.100(0.043)
3.430(0.135)
MIN
3.700(0.146)
3.300(0.130)
1.400(0.055)
0.360(0.014)
0.510(0.020)
0.000(0.000)
0.380(0.015)
Φ1.600(0.063)
MAX
4.700(0.185)
0.380(0.015)
0.550(0.022)
14.100(0.555)
14.500(0.571)
4.300(0.169)
4.400(0.173)
4.700(0.185)
1.270(0.050)
TYP
2.440(0.096)
2.640(0.104)
May 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER
AP3700E
Mechanical Dimensions
TO-92 (Ammo Packing)
Unit: mm(inch)
1.100(0.043)
1.270(0.050)
Typ
4.500(0.177)
5.500(0.217)
0.360(0.014)
3.700(0.146)
0.000(0.000)
0.380(0.015)
Φ 1.600(0.063)
MAX
14.000(0.551)
0.510(0.020)
13.000(0.512)
3.300(0.130)
1.400(0.055)
3.430(0.135)
MIN
4.700(0.185)
4.300(0.169)
4.400(0.173)
4.700(0.185)
0.380(0.015)
0.550(0.022)
2.540(0.100)
Typ
May 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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