AP3968 [BCDSEMI]
Primary Side Power Switcher for Off-line SMPS Low Total Cost Solution; 初级侧功率切换为离线SMPS总成本低的解决方案
| 型号： | AP3968 |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | Primary Side Power Switcher for Off-line SMPS Low Total Cost Solution |
| 文件： | 总15页 (文件大小：639K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Features
General Description
•
Primary Side Control for Eliminating
Opto-coupler and Secondary CV/CC Control
Circuitry
The AP3968/69/70/70S consists of a primary side
regulation controller and a high voltage transistor,
and is specially designed for off-line power supplies
within 12W output power. Typical applications
include adapter for ADSL and auxiliary supplies.
•
•
•
Built-in NPN Transistor with 700VCBO
Low Start-up Current: 0.2µA (Typ.)
Internal
Output
Cable
Voltage
Drop
Compensation
Random Frequency Modulation for Low EMI
Short Circuit Protection
Low Total Cost Solution
Output Power Range (Note 1):
AP3968 for 5W Adapter
The AP3968/69/70/70S operates at pulse frequency
modulation (PFM), and provides accurate constant
voltage, constant current (CV/CC) regulation without
requiring an opto-coupler and secondary control
circuitry. It has internal cable compensation function
for tight constant voltage regulation.
•
•
•
•
AP3969 for 7.5W Adapter
AP3970 for 12W Adapter
AP3970S for 10W Adapter
The AP3968/69/70/70S solution has fewer
component numbers, smaller size, and lower total
cost.
Note 1: Typical continuous power in a non-ventilated
enclosed adapter measured at 50ºC ambient.
The AP3968 is packaged in SOIC-7. The
AP3969/70/70S is packaged in DIP-7 and DIP-8.
Applications
•
•
•
•
•
•
Chargers
Adapters
Set Top Boxes
Auxiliary Supplies
DVD
LED Driver
SOIC-7
DIP-7
DIP-8
Figure 1. Package Types of AP3968/69/70/70S
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Pin Configuration
M Package
(SOIC-7)
P Package
(DIP-8)
8
1
GND
CPC
FB
CPC
FB
1
2
3
4
7
GND
NC
2
3
7
C
C
VCC
CS
6
VCC
CS
6
5
C
C
5
4
For AP3968
For AP3969/70/70S
P7 Package
(DIP-7)
1
7
CPC
FB
GND
2
6
5
C
C
3
4
VCC
CS
For AP3969/70/70S
Figure 2. Pin Configuration of AP3968/69/70/70S (Top View)
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Pin Description
Pin Number
Pin Name
Function
SOIC-7/DIP-7
DIP-8
This pin connects a capacitor to GND for output cable
compensation
1
1
CPC
FB
2
3
2
3
The voltage feedback from auxiliary winding
This pin receives rectified voltage from the auxiliary
winding of the transformer
VCC
CS
4
4
Current sense for primary side of transformer
This pin is connected with an internal power BJT’s
collector
5,6
5,6
7
C
NC
Not connected
7
8
GND
This pin is the signal reference ground
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Functional Block Diagram
A (B)
A for SOIC-7/DIP-7
B for DIP-8
Figure 3. Functional Block Diagram of AP3968/69/70/70S
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Ordering Information
AP39XX
-
Circuit Type
G1: Green
68: AP3968
69: AP3969
70: AP3970
70S: AP3970S
TR: Tape & Reel
Blank: Tube
Package
M: SOIC-7
P7: DIP-7
P: DIP-8
Temperature
Range
Package
Part Number
Marking ID
Packing Type
AP3968M-G1
AP3968MTR-G1
AP3969P7-G1
AP3970P7-G1
AP3970SP7-G1
AP3969P-G1
AP3968M-G1
AP3968M-G1
AP3969P7-G1
AP3970P7-G1
AP3970SP7-G1
AP3969P-G1
AP3970P-G1
AP3970SP-G1
Tube
Tape & Reel
Tube
SOIC-7
DIP-7
DIP-8
Tube
-40 to 85°C
Tube
Tube
AP3970P-G1
Tube
AP3970SP-G1
Tube
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Absolute Maximum Ratings (Note 2)
Parameter
Symbol
VCC
Value
Unit
V
Supply Voltage
-0.3 to 22
-1 to 10
700
FB Input Voltage
Collector-emitter Voltage
VFB
V
VCBO
V
AP3968/69
AP3970
1.5
4
Collector DC Current
A
AP3970S
3.2
Operating Junction Temperature
Storage Temperature
TJ
150
ºC
ºC
TSTG
-65 to 150
Lead Temperature (Soldering, 10
sec)
TLEAD
300
ºC
ESD (Machine Model)
200
V
V
ESD (Human Body Model)
2000
Note 2: 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.
Recommended Operating Conditions
Parameter
Symbol
VCC
Min
Max
22
Unit
V
Supply Voltage
Operating Temperature Range
Maximum Operating Frequency
TOP
-40
85
°C
fMAX
60
kHz
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Electrical Characteristics
VCC =15V, TJ=25°C, unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ Max Unit
UVLO Section
Turn-on Voltage
Turn-off Voltage
13
15
17
V
V
VON
No drive Current
VCC=VON-0.5V
4.5
5.3
6.3
VOFF
Standby Current Section
Start-up Current
IST
ICC
0.2
0.6
µA
320
435
550
Operating Current
Feedback Input Section
FB Input Current
IFB
VFB=4V
1.5
3.5
4.3
5.5
µA
FB Threshold Voltage
VFB
4.23
4.37
V
Power Transistor Section
Collector-emitter
AP3968/9: IC=0.5A
AP3970/70S: IC=1A
AP3968/69
VCE(SAT)
0.3
60
V
Saturation Voltage
14
17
17
26
DC Current Gain
Leakage Current
hFE
AP3970/70S
ICEO
nA
Over Temperature Protection
Shutdown Temperature
TSHDN
Surface temperature
125
160
40
ºC
ºC
Temperature Hysteresis
Thermal Impedance
Parameter
Value
Unit
Symbol
AP3968
AP3969
AP3970
AP3970S
AP3968
AP3969
AP3970
AP3970S
80
60
45
50
40
30
22
26
Junction to Ambient
Junction to Case
θJA
ºC/W
θJC
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Typical Performance Characteristics
6.5
17.0
16.5
16.0
15.5
15.0
14.5
14.0
13.5
13.0
6.0
5.5
5.0
4.5
4.0
3.5
3.0
-40
-20
0
20
40
60
80
100
120 125
-40
-20
0
20
40
60
80
100
120 125
Ambient Temperature (oC)
Ambient Temperature (oC)
Figure 4. Turn-on Voltage vs. Ambient Temperature
Figure 5. Turn-off Voltage vs. Ambient Temperature
600
550
500
450
400
350
300
-40
-20
0
20
40
60
80
100
120 125
Ambient Temperature (oC)
Figure 6. Operating Current vs. Ambient Temperature
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Operation Description
D1
VO
Vs
+
+
vIN
C1
CO
Iout
LM Np
Ns
AP3968/69/70/70S
VAUX
NAUX
RFB1
C
Q1
CS
FB
GND
CPC
RFB2
RCS
CCPC
Figure 7. Simplified Flyback Converter Controlled by AP3968/69/70/70S
Figure 7 illustrates a simplified flyback converter
controlled by AP3968/69/70/70S.
Vcs
Rcs
…………(2)
Ipk =
Constant Primary Peak Current
The primary current Ip(t) is sensed by a current sense
resistor RCS as shown in Figure 7.
The energy stored in the magnetizing inductance LM
each cycle is therefore:
1
2 …………(3)
Eg = ⋅ LM ⋅ Ipk
The current rises up linearly at a rate of:
dip(t) vg(t)
2
…………(1)
=
So the power transferring from input to output is
given by:
dt
LM
1
P = ⋅ LM ⋅ Ipk2 ⋅fSW
…………(4)
2
Where fSW is the switching frequency. When the peak
current Ipk is constant, the output power depends on
the switching frequency fSW
.
Figure 8. Primary Current Waveform
Constant Voltage Operation
As illustrated in Figure 8, when the current Ip(t) rises up to
Ipk, the switch Q1 turns off. The constant peak current is
given by:
The AP3968/69/70/70S captures the auxiliary
winding feedback voltage at FB pin and operates in
constant-voltage (CV) mode to regulate the output
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
voltage. Assuming the secondary winding is master,
the auxiliary winding is slave during the D1 on-time.
The auxiliary voltage is given by:
discharging or charging the built-in capacitance
connected. This fixed proportion is
Tons
Toffs
4
3
………… (6)
=
NAUX
…………(5)
VAUX
=
⋅
(
Vo + Vd
)
NS
The relation between the output constant-current and
secondary peak current Ipks is given by:
Where Vd is the diode forward drop voltage, NAUX is
the turns of auxiliary winding, and NS is the turns of
secondary winding.
1
Tons
…………(7)
Iout = ⋅Ipks⋅
2
Tons + Toffs
At the instant of D1 turn-on, the primary current
transfers to the secondary at an amplitude of:
NP
…………(8)
Ipks =
⋅ Ipk
NS
Thus the output constant current is given by:
2 NP
…………(9)
Iout =
⋅
⋅Ipk
Figure 9. Auxiliary Voltage Waveform
7 NS
The output voltage is different from the secondary
voltage in a diode forward drop voltage Vd which
depends on the current. If the secondary voltage is
always detected at a constant secondary current, the
difference between the output voltage and the
secondary voltage will be a fixed Vd. The voltage
detection point is portion of Tons after D1 is turned
on. The CV loop control function of
AP3968/69/70/70S then generates a D1 off-time to
regulate the output voltage.
Leading Edge Blanking (LEB)
When the power switch is turned on, a turn-on spike
on the output pulse rising edge will occur on the
sense-resistor. To avoid false termination of the
switching pulse, a typical 500ns leading edge
blanking is built in. During this blanking period, the
current sense comparator is disabled and the gate
driver can not be switched off.
The built-in LEB in AP3968/69/70/70S has shorter
delay time from current sense terminal to output
pulse than those IC solutions adopting external RC
filter as LEB.
Constant Current Operation
The AP3968/69/70/70S is designed to work in
constant current (CC) mode. Figure 10 shows the
secondary current waveforms.
Built-in Cable Compensation
The AP3968/69/70/70S has built-in fixed voltage of
0.35V typical to compensate the drop of output cable
when the load is changed from zero to full load. A
typical 0.01µF external capacitor connected to the
CPC pin is used to smooth voltage signal for cable
compensation.
Over Temperature Protection
The AP3968/69/70/70S has internal thermal sensing
circuit to shut down the PFM driver output when the
die temperature reaches 160ºC typical. When the die
temperature drops about 40ºC, the IC will recover
automatically to normal operation.
Figure 10. Secondary Current Waveform
In CC operation, the CC loop control function of
AP3968/69/70/70S will keep a fixed proportion
between D1 on-time Tons and D1 off-time Toffs by
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
10
Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Typical Application
Figure 11. Typical Application of AP3969 (9V/800mA)
Item
Description
10.0µF/400V,
electrolytic
QTY
Item
Description
QTY
C1
1
U1
AP3969
1
4.7µF/400V,
electrolytic
C2
1
R1
1
11Ω, 2W
C3
C5
C8
1
1
1
R3
R5
R6
1
1
1
3.3µF/50V, electrolytic
1nF/1kV, ceramic
3.3MΩ/0.25W
3.9Ω , 0805
150KΩ, 1206
0.01µF, 0805
1nF/250Vac, Y1
capacitor
C10
1
R7
1
1Ω, 1206
C11
C12, C13
D1 to D6
D12
1nF, 0805
1
2
6
1
1
R8
R9
R10
R11
R12
1
1
1
1
1
20KΩ, 0805
13KΩ, 0805
360Ω, 0805
470µF/16V
1N4007, rectifier diode
SB3100
27Ω, 0805
L1
470µH, inductor
1.2kΩ, 0805
EE16 core, PC40,
transformer
L2
Bead, 0805
1
T1
1
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
11
Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Mechanical Dimensions
SOIC-7
Unit: mm(inch)
5.800(0.228)
6.200(0.244)
1.350(0.053)
1.750(0.069)
0.330(0.013)
0.510(0.020)
2.54(0.100)
TYP
4.700(0.185)
5.100(0.201)
1.270(0.050)
TYP
0.100(0.004)
0.250(0.010)
3.800(0.150)
4.000(0.157)
1.250(0.049)
1.500(0.059)
0.190(0.007)
0.250(0.010)
0.450(0.017)
0.800(0.031)
Note: Eject hole, oriented hole and mold mark is optional.
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
12
Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Mechanical Dimensions (Continued)
DIP-7
Unit: mm(inch)
7.320(0.288)
7.920(0.312)
0.204(0.008)
0.360(0.014)
3.200(0.126)
3.710(0.146)
4.310(0.170)
3.600(0.142)
0.510(0.020)MIN
3.000(0.118)
3.600(0.142)
0.380(0.015)
0.570(0.022)
1.524(0.060)
BSC
8.400(0.331)
9.000(0.354)
2.540(0.100)BSC
6.200(0.244)
6.600(0.260)
9.000(0.354)
9.400(0.370)
Note: Eject hole, oriented hole and mold mark is optiona.l
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
13
Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
Mechanical Dimensions (Continued)
DIP-8
Unit: mm(inch)
0.700(0.028)
7.620(0.300)TYP
1.524(0.060) TYP
5°
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)
Note: Eject hole, oriented hole and mold mark is optional.
Dec. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
14
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
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- Wafer Fab
BCD Semiconductor Manufacturing Limited
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
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