AP3710_08 [BCDSEMI]
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER; 低功率PWM控制器离线ADAPTER
| 型号： | AP3710_08 |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER |
| 文件： | 总16页 (文件大小：512K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
General Description
Features
The AP3710 is a green-mode PWM controller, its main
applications are low power supplies such as offline
battery chargers, adapters, STB and other auxiliary
supplies, where the needs for low no load power, low
total cost and high reliability are all required.
·
·
·
·
·
·
·
·
·
·
Current Mode Control with Skip Cycle Capability
Low Start-up Current: 0.25 mA
Low Operating Current: 0.45mA
Output Current Capacity: 900 mA
Fixed Switching Frequency: 60 kHz
Frequency Dithering for Low EMI
Under-Voltage Lockout with Hysteresis
Built-in Slope Compensation
Short Circuit Protection
Open and Short Circuit Protection for Opto-
Coupler
The functional blocks of AP3710 include: under volt-
age lockout with low start-up current; precise voltage
reference for internal comparators; PWM comparator
with current limit control, feedback signal and band-
gap input; short circuit comparator and open circuit
protection for opto-coupler.
·
·
·
Maximum Input Power is 0.2W under No Load
Maximum Input Power is 1W under 0.5W Load
Low Total Cost Solution
The AP3710 operates at a fixed 60kHz switching fre-
quency, its output connects to the emitter of high volt-
age NPN transistor or the source of MOSFET. In
normal mode, it works as a switch to turn on or turn off
the external transistor. In failure modes like open loop,
over voltage or overload due to short circuit, the chip
enters into an auto restart mode controlled by the inter-
nal protection unit.
Applications
·
·
·
·
·
Adapters
Battery Chargers
Set Top Boxes
Auxiliary Supplies
DVD
The AP3710 is available in SOIC-8 and DIP-8 pack-
ages.
DIP-8
SOIC-8
Figure 1. Package Types of AP3710
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
1
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Pin Configuration
M/P Package
(SOIC-8/DIP-8)
GND
NC
1
2
8
7
VCC
NC
VA
3
4
6
5
NC
OUT
VSEN
Figure 2. Pin Configuration of AP3710 (Top View)
Pin Description
Pin Number
Pin Name
GND
Function
1
2
Power supply ground
VCC
The power supply of the IC and this terminal is also used for the feedback control
Not connected
3, 6, 8
NC
The PWM output is directly connected to the emitter of NPN transistor or the source
of MOSFET
4
5
7
OUT
VSEN
VA
It is used for line voltage compensation, and PWM uses this to terminate the output
switch conduction
It is used for short circuit protection, and this terminal will be pulled down to low
level when short circuit happens at the load side
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
2
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Functional Block Diagram
START-UP
4
2
CURRENT
VCC
OUT
SOURCE
UVLO
COMPARATOR
BIAS
VREF
(1.2V)
-
OSCILLATOR
+
PWM
COMPARATOR
FB
DRIVER
+
5
PWM
VSEN
-
-
CONTROL
VREF
(1.2V)
DISCHARGE
COMPARATOR
SLOP
COMPENSATION
7
VA
+
_
DISCHARGE
LOGIC
VREF
(1.2V)
1
GND
Figure 3. Functional Block Diagram of AP3710
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
3
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Ordering Information
AP3710
-
Circuit Type
Package
E1: Lead Free
G1: Green
TR: Tape and Reel
Blank: Tube
M: SOIC-8
P: DIP-8
Part Number
Marking ID
Switching Temperature
Package
Packing Type
Frequency
Range
Lead Free
AP3710M-E1
Green
Lead Free
3710M-E1
3710M-E1
AP3710P-E1
Green
AP3710M-G1
3710M-G1
3710M-G1
AP3710P-G1
Tube
Tape & Reel
Tube
-40 to 85oC
-40 to 85oC
SOIC-8
DIP-8
60kHz
AP3710MTR-E1 AP3710MTR-G1
AP3710P-E1 AP3710P-G1
60kHz
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
V
Supply Voltage
Voltage at OUT
Analog Input at VSEN
-0.3 to 6.3
-0.3 to 40
-0.3 to 6.3
V
V
Output Current at OUT
Power Dissipation
Internally limited
A
0.6
W
oC
oC
Operating Junction Temperature
150
Storage Temperature
-65 to 150
300
oC
V
Lead Temperature (Soldering, 10s)
ESD (Machine Model)
250
ESD (Human Body Model)
3000
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.
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Electrical Characteristics
o
(V =4V, T =25 C, unless otherwise specified.)
CC
J
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
UVLO SECTION
Turn on Threshold Voltage
Turn off Threshold Voltage
Discharge Voltage
V
CC (on)
CC (off)
VDIS
5.30
3.4
5.60
3.65
2.9
5.90
3.90
3.1
V
V
V
V
2.7
STANDBY CURRENT SECTION
Start-up Current
IST
VCC=4V
0.25
0.45
7
0.4
0.7
7.5
30
mA
Operating Current
I
CC(opr)
VCC Zener Voltage
VZ
ICC=10mA
6.5
10
V
Dynamic Impedance
INTERNAL OSCILLATOR
Switching Frequency
Frequency Dithering
Temperature Stability
DRIVE OUTPUT SECTION
OUT Turn-on Voltage
OUT Turn-off Voltage
Rise Time
RVCC
VCC=3.8 to 4.8V (Note 2)
18
kΩ
FSW
(Note 3)
50
60
±3.5
5
70
kHz
kHz
%
±2
±5
-40 to 85oC
V
OUT(on)
7.6
5.7
9.3
6.8
60
30
75
3
11
V
V
V
OUT(off)
7.9
TR
CL=1nF, 15Ω pull-up
CL=1nF, 15Ω pull-up
VCC(off) + 0.2V
ns
%
Fall Time
TF
Maximum Duty Cycle
Minimum Duty Cycle
Driver OUT On-Resistance
Switch Off Current (OUT)
Effective Current Limit
OUT Current Coefficient
CURRENT SECTION
Maximum Input Signal
DMAX
68
82
5
VCC=VCC (on)-0.2V
ROUT
IOUT=0.7A
3
5
Ω
Driver off, VOUT=10V
VCC=VCC(off)+0.5V
20
900
-0.6
40
μA
ILIM
GA
800
0.9
mA
A/V
VSEN
1.0
1.1
V
Note 2: Guaranteed by design, not tested in production.
Note 3: The fixed oscillation frequency, the frequency jittering is not included.
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Electrical Characteristics (Continued)
1N5819
L
C2
100μF/50V
+
70μH
R
100Ω/3W
C1
100μF/50V
+
_
V
IN =10V
+
27V Zener
GND
OUT
AP3710
VCC
C3
2200pF
VCC=VCC(off)+0.5V
Figure 4. The Test Circuit for Current Limit
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
6
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Typical Performance Characteristics
400
680
640
600
560
520
480
440
400
360
320
360
320
280
240
200
160
120
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Ambient Temperature (oC)
Ambient Temperature (oC)
Figure 5. Operating Current vs. Ambient Temperature
Figure 6. Start-up Current vs. Ambient Temperature
70
68
66
64
62
60
58
56
500
400
300
200
100
0
-40
-20
0
20
40
60
80
100
120
1
2
3
4
5
Ambient Temperature (oC)
VCC Voltage (V)
Figure 7. Start-up Current vs. VCC Voltage
Figure 8. Switching Frequency vs. Ambient Temperature
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Typical Performance Characteristics (Continued)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
3.10
3.05
3.00
2.95
2.90
2.85
2.80
2.75
2.70
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Ambient Temperature (oC)
Ambient Temperature (oC)
Figure 10. Discharge Voltage vs. Ambient Temperature
Figure 9. Normalized Current Limit
vs. Ambient Temperature
5.5
5.4
5.3
5.2
5.1
5.0
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Ambient Temperature (oC)
Ambient Temperature (oC)
Figure 11. On Resistance vs. Ambient Temperature
Figure 12. Turn on Voltage vs. Ambient Temperature
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
8
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
VIN
VO
Function Description
Rectified AC
1. UVLO and Start up Circuit
The AP3710's turn on threshold voltage is 5.6V and its
D6
R2+R3
turn off threshold voltage is 3.65V, so the UVLO
R5
hysteresis voltage is 1.95V, which helps AP3710 to
R13
draw adequate energy to supply VCC terminal during
start-up. Please see Figure 13 for UVLO chart.
Q1
R14
APT13003
R16
C7
U3
PC817
D6
R8
R6
U2
AZ431
R7
C5
OUT VSEN
R16
+
VCC
GND
VA
+
C4
C6
Turn on
Turn off
U1
AP3710
Figure 14. The Start-up
Circuit of Typical Application
3.65 5.6
VCC: Supply Voltage (V)
In start-up section of typical application shown by
Figure 14, the rectified line voltage V charges the
Figure 13. 5.6/3.65V UVLO
Threshold of AP3710
IN
capacitor C4 through start-up resistor R2+R3 until Q1
is turned on so OUT terminal can directly drive
external Q1, a MOSFET inside AP3710 is connected
in series with the Q1.
The VCC terminal in Figure 3 is used for both bias
supply and feedback control. When AP3710 is
powered on, the start-up current source turns on and it
can not turn off until VCC level increases to its
threshold value and PWM pulse is produced.
Once the start-up is set up, the auxiliary bias winding
will supply the VCC terminal enough operating
current. The start-up sequence is shown in Figure 15.
Figure 15. Power up Waveforms
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
9
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Function Description (Continued)
2. VCC/Feedback Control
5. Current Limit Control
In Figure 14, an opto-coupler and secondary constant
voltage consists of voltage feedback network. Voltage
feedback loop consists of shunt regulator AZ431 and
FB/VCC terminal of AP3710. When load is heavy, the
voltage on VCC terminal will decrease to enlarge duty
cycle; on the contrary, if load drops, the voltage on
VCC will increase to reduce duty cycle.
The AP3710 employs current mode control to
improve transient response and voltage stability. In
Figure 3, 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.
3. Skip Cycle Mode Operation
6. Frequency Dithering
The AP3710 enters skip cycle mode when load power
drops below a given level, and this is performed by
sensing the VCC voltage level, i.e., the heavier load
power, the lower VCC voltage level. In normal
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 performance by reducing
both quasi peak and average EMI emissions.
operation, the VCC terminal indicates
a peak
inductance current under certain load power. If the
load power decreases, VCC voltage level increases to
ask for less peak current. When it reaches a
determined value, the IC prevents the current from
decreasing further down and starts to blank the output
pulses, the IC then enters the skip cycle mode
operation. Figure 16 is the sketch for the two operation
mode.
Normal
PWM
Waveform
Cycle Skip
Waveform
0
t
Figure 16. Skip Cycle and Normal PWM Waveform
Figure 17. Frequency Dither Influences
the Switching Cycle
4. Slope Compensation
The AP3710 is current mode PWM controller, and it
regulates peak inductance current by its current
control loop. It is known that a continuous conduction
mode SMPS may induce noise and harmonic
oscillation on current sense or feedback signal, and
this is especially serious when duty cycle exceeds
50%. The internal slope compensation of AP3710 can
improve power supply stability by increasing the
current slope.
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
10
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Function Description (Continued)
7. Short Circuit Protection
Internal short circuit control can protect a SMPS from
being damaged when short circuit at its output
happens.
From
VCC
From
UVLO
Discharge
Comparator
VA
Discharge
Logic
In Figure 18, when VCC drops below its turn off
threshold value, the UVLO comparator's output will
control the Discharge Logic to pull VA terminal to low
level, and the low level is kept before the VCC voltage
drops below the threshold value of discharge compara-
tor. Then the system will re-startup from C4 charging
again and the same process will repeat indefinitely.
The long start-up period makes the input power low
enough to ensure the whole system in safety under
output short circuit condition.
VREF
1.2V
Figure 18. Short Circuit Protection Block
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
11
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Typical Application
R1
D1-D4
R11 C11
D8
T1
EE16
L2
12V/1A
L3
L4
VO
+
+
+
+
C3
D7
+
R9
C8
C9
F1
R4
R2
ZD2
J1
C1
C2
AC 85-264V
VO
-
D5
R5
R3
R13
R15
R14
R16
C7
Q1
U3
D6
R6
R8
U2
R7
OUT VSEN
+
VCC
GND
VA
C5
+
C4
C10
C6
U1
Figure 19. 12V/1A Adapter
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
12
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Bill of Materials for Figure 19
Designator
Part Type
Resistor, NTC Resistor, 5Ω
Resistor, 1MΩ, 1206
Resistor, 68kΩ, 1206
Resistor, 3Ω, 0805
Designator
C1, C2
C3
Part Type
R1
Electrolytic Capacitor, 10 μF/400V, φ10
Capacitor, 2200pF, d=5mm
Capacitor, 10μF, d=4.5mm
Capacitor, 22nF, 0805
R2, R3
R4
C4, C5
C6
R5
R6
Resistor, 200Ω, 0805
Resistor, 2kΩ, 0805
C7
Capacitor, 0.47μF, 0805
Electrolytic Capacitor, 1000μF
Electrolytic Capacitor, 220μF
Y Capacitor, 2200pF
R7
C8
R8
Resistor, 5.1MΩ, SIP
C9
R9, R15, R16 Resistor, 3kΩ, 0805
C10
C11
L2
R11
R13
R14
Resistor, 15 Ω, 1206
Resistor, 1kΩ, 0805
Resistor, 11.4kΩ, 0805
Capacitor, 1nF, 0805
Inductor, 300μH/0.3A
L4
Inductor, 100μH/1A
T1
Transformer, EE-20
D1 to D4
D5, D6
D7
Diode, 1N4007, DO-41
Diode, 1N4148, LL-34
Diode, FR107, DO-15
Diode, 3100, DO-201
ZD2
Q1
Zener, 13V/1W
Transistor, APT13003E, TO-126
IC, AP3710
U1
D8
U3
Opto-coupler, PC817, DIP-4
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
13
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Mechanical Dimensions
SOIC-8
Unit: mm(inch)
4.700(0.185)
0.320(0.013)
1.350(0.053)
1.750(0.069)
5.100(0.201)
0.675(0.027)
0.725(0.029)
D
5.800(0.228)
6.200(0.244)
1.270(0.050)
TYP
D
20:1
φ
0.800(0.031)
0.200(0.008)
0.100(0.004)
0.300(0.012)
0°
8°
1.000(0.039)
3.800(0.150)
4.000(0.157)
0.190(0.007)
0.250(0.010)
1°
5°
0.330(0.013)
0.510(0.020)
0.900(0.035)
6)
00
(0.
50
.1
R0
0.450(0.017)
0.800(0.031)
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
14
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
AP3710
Mechanical Dimensions (Continued)
DIP-8
Unit: mm(inch)
0.700(0.028)
7.620(0.300)TYP
5°
1.524(0.060) TYP
6°
3.200(0.126)
3.600(0.142)
3.710(0.146)
4.310(0.170)
0.510(0.020)MIN
3.000(0.118)
3.600(0.142)
0.204(0.008)
0.360(0.014)
0.254(0.010)TYP
8.200(0.323)
9.400(0.370)
2.540(0.100)TYP
0.130(0.005)MIN
0.360(0.014)
0.560(0.022)
6.200(0.244)
6.600(0.260)
R0.750(0.030)
Φ3.000(0.118)
Depth
0.100(0.004)
0.200(0.008)
9.000(0.354)
9.400(0.370)
Aug. 2008 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
15
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