AP3708NMTR-G1 [DIODES]
Battery Charge Controller, Voltage-mode, 60kHz Switching Freq-Max, PDSO8, GREEN, SOIC-8;
| 型号： | AP3708NMTR-G1 |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Battery Charge Controller, Voltage-mode, 60kHz Switching Freq-Max, PDSO8, GREEN, SOIC-8 电池 光电二极管 |
| 文件： | 总13页 (文件大小：1309K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3708N
General Description
Features
The AP3708N is a high performance AC/DC power
supply controller for battery charger and adapter appli-
cations. The device uses Pulse Frequency Modulation
(PFM) method to build discontinuous conduction
mode (DCM) flyback power supplies.
·
·
Primary Side Control for Rectangular Constant
Current and Constant Voltage Output
Eliminates Opto-Coupler and Secondary CV/CC
Control Circuitry
Eliminates Control Loop Compensation Circuitry
Output Cable Resistor Compensation
Flyback Topology in DCM Operation
Random Frequency Modulation to Reduce
System EMI
Valley Turn on of External Power NPN Transistor
Maximum Switching Frequency: 110kHz
Built-in Soft Start
Over Voltage Protection
Short Circuit Protection
·
·
·
·
The AP3708N provides accurate constant voltage, con-
stant current (CV/CC) regulation without requiring the
opto-coupler and the secondary control circuitry. It
also eliminates the need of loop compensation circuitry
while maintaining stability.
·
·
·
·
·
The AP3708N achieves excellent regulation and high
power efficiency, the no-load power consumption is
less than 150mW.
The AP3708N is available in SOIC-8 package.
Applications
·
·
Adapters/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
Standby and Auxiliary Power Supplies
SOIC-8
Figure 1. Package Type of AP3708N
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
AP3708N
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
Pin Configuration
M Package
(SOIC-8)
8
7
1
2
3
4
CS
VCC
OUT
GND
BIAS
VDD
FB
6
5
CMP
Figure 2. Pin Configuration of AP3708N (Top View)
Pin Description
Pin Number
Pin Name
Function
The primary current sense
1
2,
3
4
5
6
7
8
CS
VCC
OUT
GND
CMP
FB
Supply voltage
This pin drives the base of external power NPN switch
Ground
This pin connects a capacitor for output cable compensation
The voltage feedback from the auxiliary winding
The 5V output of the internal voltage regulator
VDD
BIAS
This pin sets the bias current inside AP3708N with an external resistor to GND
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
AP3708N
Functional Block Diagram
VCC
2
UVLO
pro
OVP
&
7
6
VDD
OCkP
FB
Regulator
UVLO
&
Bias
0.1V
COMP
Tonsec
Tons
Detector
8
pfm
BIAS
EA
Vea
V+
S&H
4.0V
Tons
3
COMP
pfm
CV_ctrl
R
S
Q
Driver
OUT
pfm_d
V+
Vea
t
1
CS
COMP
0.5V
pfm
pfm_d
LEB Delay
430ns
COMP
0.46V
VDD
I
Tons
4
CC_ctrl
COMP
R
S
Q
3.75V
GND
0.75*I
FB
3.65V
5
CMP
Figure 3. Functional Block Diagram of AP3708N
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
3
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
Ordering Information
AP3708N
AP3708N
-
G1: Green
Circuit Type
TR: Tape and Reel
Blank: Tube
Package
M: SOIC-8
Package
Temperature Range
Part Number
AP3708NM-G1
AP3708NMTR-G1
Marking ID
Packing Type
Tube
3708NM-G1
3708NM-G1
-40 to 85oC
SOIC-8
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
Absolute Maximum Ratings (Note 1)
Parameter
Value
-0.3 to 30
-0.3 to 7
Unit
V
Supply Voltage VCC
Voltage at CS, BIAS, OUT, VDD, CMP to GND
FB input (Pin 6)
V
-40 to 10
V
Output Current at OUT
Internally limited
0.657
A
Power Dissipation at TA=25oC
Operating Junction Temperature
W
oC
oC
oC
150
-65 to 150
300
Storage Temperature
Lead Temperature (Soldering, 10s)
Thermal Resistance Junction-to-Ambient
ESD (Machine Model)
oC/W
V
190
200
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.
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3708N
Electrical Characteristics
o
(V =15V, T =25 C, unless otherwise specified.)
CC
A
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
UVLO SECTION
VTH (ST)
Start-up Threshold
16.5
6.3
17.5
6.7
18.5
7.1
V
V
Minimal Operating Voltage
VOPR(min) After turn on
REFERENCE VOLTAGE SECTION
RBIAS=200kΩ,
Before turn on
VBIAS
VDD
BIAS Pin Voltage
1.073
4.82
1.10
5.00
1.127
5.18
V
V
VDD Pin Voltage
STANDBY CURRENT SECTION
VCC = VTH (ST)-0.5V,
IST
Start-up Current
44
52
µA
µA
RBIAS=200kΩ, Before turn on
Operating Current
ICC(OPR) RBIAS=200kΩ
635
700
DRIVE OUTPUT SECTION
Sink
50
24
IOUT
RBIAS=200kΩ
BIAS=200kΩ
OUT Maximum Current
mA
Source
Maximum Switching Frequency
CURRENT SENSE SECTION
30
R
110
kHz
VCS
VCS(PRE)
Current Sense Threshold
486
388
508
410
430
530
432
mV
mV
ns
Pre-Current Sense
Leading Edge Blanking
FEEDBACK INPUT SECTION
Feedback Pin Input Leakage
Current
IFB
VFB=4V
1.8
2.25
2.7
µA
VFB
Feedback Threshold Voltage
Enable Turn-on Voltage
3.99
-0.9
4.03
-0.7
0.40
4.07
-0.5
V
V
V
VFB(EN)
Cable Compensation Voltage
fSW=60kHz
PROTECTION SECTION
VFB(OVP)
Over Voltage Protection
7
8
9
V
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3708N
Typical Performance Characteristics
80
70
60
50
40
30
20
20.0
19.5
19.0
18.5
18.0
17.5
17.0
16.5
16.0
15.5
15.0
-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 4. Start-up Voltage vs. Ambient Temperature
Figure 5. Start-up Current vs. Ambient Temperature
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
1000
900
800
700
600
500
400
300
200
-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 7. VDD vs. Ambient Temperature
Figure 6. Operating Current vs. Ambient Temperature
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3708N
Typical Performance Characteristics (Continued)
80
100
70
90
60
80
50
70
40
60
30
50
20
40
TA=25oC
TA=25oC
10
30
0
100
20
100
150
200
250
300
350
400
150
200
250
300
350
400
Bias Resistor (kΩ)
Bias Resistor (kΩ)
Figure 9. OUT Source Current vs. Bias Resistor
Figure 8. Start-up Current vs. Bias Resistor
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3708N
Operation Description
D1
Vs
VO
+
+
vin
Co
C1
Io
LM Np
Ns
Q1
VAUX
NAUX
OUT
AP3708N
FB
CS
CMP
GND
Ip
C2
Rcs
Figure 10. Simplified Flyback Converter Controlled by AP3708N
Figure 10 illustrates a simplified flyback converter
controlled by AP3708N.
The energy stored in the magnetizing inductance L
each cycle is therefore:
M
1
Eg = ×LM ×Ipk2
Constant Primary Peak Current
The primary current ip(t) is sensed by a current sense
......(3)
2
resistor R as shown in Figure 10.
CS
So the power transferring from the input to the output
is given by:
The current rises up linearly at a rate of:
1
P = ×LM ×Ipk2 × fSW
dip(t) vg(t)
......(4)
......(1)
=
2
dt
LM
where f is the switching frequency. When the peak
SW
See equation 2
current Ipk is constant, the output power depends on
the switching frequency f
.
SW
Ip
Constant Voltage Operation
0A
The AP3708N captures the auxiliary winding
feedback voltage at FB pin and operates in constant-
voltage (CV) mode to regulate the output voltage.
Assuming the secondary winding is master, the
auxiliary winding is slave during the D1 on-time. The
auxiliary voltage is given by:
Figure 11. Primary Current Waveform
As illustrated in Figure 11, when the current ip(t) rises
up to Ipk, the switch Q1 turns off. The constant peak
current is given by:
NAUX
Vcs
VAUX
=
×
(
Vo +Vd
)
......(5)
Ipk =
......(2)
NS
Rcs
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
AP3708N
Operation Description (Continued)
where Vd is the diode forward drop voltage.
The relationship between the output constant-current
and secondary peak current Ipks is given by:
See equation 5
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:
0V
2/3 Tons
Tons
NP
Ipks =
× Ipk
......(8)
NS
Figure 12. Auxiliary Voltage Waveform
Thus the output constant-current is given by:
The output voltage is different from the secondary
voltage in a diode forward drop voltage that depends
on the current. If the secondary voltage is always
detected at a fixed secondary current, the difference
between the output voltage and the secondary voltage
will be a fixed Vd. The voltage detection point is at
two-thirds of the D1 on-time. The CV loop control
function of AP3708N then generates a D1 off-time to
regulate the output voltage.
NP
NS
NP
NS
1
2
Tons
2
7
Iout =
×
×Ipk×
=
×
×Ipk
......(9)
Tons+Toffs
Leading Edge Blanking
When the power switch is turned on, a turn-on spike
will occur on the sense-resistor. To avoid false-
termination of the switching pulse, a 430ns 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.
Constant Current Operation
Figure 13 shows the secondary current waveforms.
See equation 8
CCM Protection
The AP3708N is designed to operate in discontinuous
conduction mode (DCM) in both CV and CC modes.
To avoid operating in continuous conduction mode
(CCM), the AP3708N detects the falling edge of the
FB input voltage on each cycle. If a 0.1V falling edge
of FB is not detected, the AP3708N will stop
switching.
Iout
Is
0A
Toffs
Tons
Figure 13. Secondary Current Waveform
In CC operation, the CC loop control function of
AP3708N will keep a fixed proportion between D1
on-time Tons and D1 off-time Toffs by discharging or
charging the capacitance connected in CMP pin. The
fixed proportion is
OVP & OCkP
The AP3708N includes output over-voltage protection
(OVP) and open circuit protection (OCkP) circuitry as
shown in Figure 14. If the voltage at FB pin exceeds
8V, 100% above the normal detection voltage, or the
-0.7V falling edge of the FB input can not be
monitored, the AP3708N will immediately shut off
and enter hiccup mode. The AP3708N sends out a
fault detection pulse every 32ms in hiccup mode until
the fault has been removed.
Tons
Toffs
4
3
......(6)
=
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
AP3708N
Operation Description (Continued)
Through the internal RA and RB, the FB voltage can
be compensated by the Vout1, the compensation
voltage is 0.4V when full load switch frequency is
60kHz.
FB
COMP
pro
8V
R
S
Q
COMP
RB
FB
VCMP
-0.7V
RA
Tons
Timer_32ms
UVLO
Vout1
3.65V
CMP
Figure 14. OVP and OCkP Function Block
Output Cable Compensation
The AP3708N integrates the output cable
compensation circuitry as shown in Figure 15. Tons
shows the variation for FB flyback voltage. Tons can
be converted to a DC voltage by a low-pass filter.
When system load current Iout changed from open
load to full load Iload, The amplified voltage Vout1
through a rail-to-rail operation amplifier is obtained:
Figure 15. Output Cable Compensation Function Block
RB
RA
RB
RA
......(10)
VOUT1 = (1+
)×3.65V −
×VCMP
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
10
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
AP3708N
Typical Application
Bridge
D2
5.1V/0.75A
T1
VO+
+
+
R1
R3
C6
C1
+
J1
D1
C2
Na
Ns
Z1
R2
AC 85-264V
VO-
Np
Q1
VCC
CS
OUT
Nfb
R7
C5
AP3708N
R4
BIAS
FB
GND CMP
VDD
R6
R8
R9
Rs
R5
Rbias
C3
C4
Figure 16. 5V/1A Output for Battery Charger of Mobile Phone
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
11
Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
Mechanical Dimensions
AP3708N
SOIC-8
Unit: mm(inch)
4.700(0.185)
5.100(0.201)
0.320(0.013)
1.350(0.053)
1.750(0.069)
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
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)
)
06
(0.0
150
R0.
0.450(0.017)
0.800(0.031)
Note: Eject hole, oriented hole and mold mark is optional.
Apr. 2009 Rev. 2. 1
BCD Semiconductor Manufacturing Limited
12
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
CD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
cular purpose, nor does BCD
AIN SITE
- Headquarters
- Wafer Fab
BCD Semiconductor Manufacturing Limited
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China
800 Yi Shan Road, Shanghai 200233, China
Tel: +86-21-24162266, Fax: +86-21-24162277
Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
REGIONAL SALES OFFICE
Shenzhen Office
Taiwan Office
USA Office
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office
BCD Semiconductor (Taiwan) Company Limited
BCD Semiconductor Corp.
Unit A Room 1203, Skyworth Bldg., Gaoxin Ave.1.S., Nanshan District, Shenzhen,
4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,
30920 Huntwood Ave. Hayward,
China
Taiwan
Tel: +886-2-2656 2808
CA 94544, USA
Tel: +86-755-8826 7951
Tel : +1-510-324-2988
Fax: +86-755-8826 7865
Fax: +886-2-2656 2806
Fax: +1-510-324-2788
相关型号：
©2020 ICPDF网 联系我们和版权申明