AP3706P-G1 [BCDSEMI]
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS; 一次侧控制IC进行离线电池充电器型号: | AP3706P-G1 |
厂家: | BCD SEMICONDUCTOR MANUFACTURING LIMITED |
描述: | PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS |
文件: | 总13页 (文件大小:275K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
General Description
Features
The AP3706 is a high performance AC/DC power sup-
ply controller for battery charger and adapter applica-
tions. 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
Flyback Topology in DCM Operation
Random Frequency Modulation to Reduce
System EMI
Valley Turn on of External Power NPN Transistor
Built-in Soft Start
Open Circuit Protection
·
·
·
The AP3706 provides constant voltage, constant cur-
rent (CV/CC) regulation without requiring an opto-
coupler and secondary control circuitry. It also elimi-
nates the need of loop compensation circuitry while
maintaining stability.
·
·
·
The AP3706 achieves excellent regulation and high · Over Voltage Protection
power efficiency, the no-load power consumption is
less than 200mW at 265VAC input.
·
Short Circuit Protection
Applications
The AP3706 is available in SOIC-8 and DIP-8 pack-
ages.
·
·
Adapters/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
Standby and Auxiliary Power Supplies
SOIC-8
DIP-8
Figure 1. Package Types of AP3706
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
1
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Pin Configuration
M/P Package
(SOIC-8/DIP-8)
CS
COMP
1
2
8
7
VCC
OUT
GND
BIAS
VDD
FB
3
4
6
5
Figure 2. Pin Configurations of AP3706 (Top View)
Pin Description
Pin Number
Pin Name
CS
Function
The primary current sense
1
2
3
4
5
6
7
8
VCC
OUT
GND
FB
Supply voltage
This pin drives the base of external power NPN switch
Ground
The voltage feedback from the auxiliary winding
The 5V output of the internal voltage regulator
This pin sets the bias current inside AP3706 with an external resistor to GND
This pin connects a bypass capacitor for CC function
VDD
BIAS
COMP
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
2
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Functional Block Diagram
VCC
2
UVLO
pro
OVP
&
6
5
VDD
OCkP
FB
Regulator
UVLO
&
Bias
0.1V
COMP
Tonsec
Tons
Detector
7
3
pfm
BIAS
OUT
EA
Vea
V+
S&H
4.0V
Tons
COMP
pfm
CV_ctrl
R
S
Q
Driver
pfm_d
V+
Vea
1
t
CS
COMP
COMP
0.5V
pfm
pfm_d
LEB Delay
430ns
0.46V
VDD
I
Tons
8
4
CC_ctrl
COMP
R
S
Q
3.75V
COMP
GND
0.75*I
Figure 3. Functional Block Diagram of AP3706
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
3
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Ordering Information
AP3706
-
E1: Lead Free
G1: Green
Circuit Type
Package
M: SOIC-8
P: DIP-8
TR: Tape and Reel
Blank: Tube
Part Number
Marking ID
Temperature
Package
Packing Type
Range
Lead Free
AP3706M-E1
AP3706MTR-E1
AP3706P-E1
Green
Lead Free
Green
3706M-G1
3706M-G1
AP3706M-G1
AP3706MTR-G1
AP3706P-G1
3706M-E1
3706M-E1
Tube
Tape & Reel
Tube
SOIC-8
DIP-8
-40 to 85oC
AP3706P-E1 AP3706P-G1
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
-0.3 to 30
-0.3 to 7
Unit
V
Supply Voltage VCC
Voltage at CS, BIAS, OUT, VDD, COMP to GND
FB input (Pin 5)
V
-40 to 10
V
Output Current at OUT
Internally limited
0.657
A
Power Dissipation at TA=25oC
Operating Junction Temperature
Storage Temperature
W
oC
oC
oC
150
-65 to 150
300
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.
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
4
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
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
17
18.5
7.3
20
V
V
Minimal Operating Voltage
VOPR(min) After turn on
6.5
8.1
REFERENCE VOLTAGE SECTION
RBIAS=200kΩ,
Before turn on
VBIAS
VDD
BIAS Pin Voltage
1.170
4.75
1.205
5.0
1.240
5.25
V
V
VDD Pin Voltage
STANDBY CURRENT SECTION
VCC = VTH (ST)-0.5V,
IST
Start-up Current
70
80
μA
μA
RBIAS=200kΩ, Before turn on
Operating Current
ICC(OPR) RBIAS=200kΩ
680
900
DRIVE OUTPUT SECTION
Sink
50
25
IOUT
RBIAS=200kΩ
OUT Maximum Current
mA
Source
30
CURRENT SENSE SECTION
VCS
VCS(PRE)
Current Sense Threshold
490
440
510
460
430
530
480
mV
mV
ns
Pre-Current Sense
Leading Edge Blanking
FEEDBACK INPUT SECTION
Feedback Pin Input Leakage
Current
IFB
VFB=4V
10.0
12.5
15.0
μA
VFB
Feedback Threshold
3.90
-0.9
4.00
-0.7
4.10
-0.5
V
V
VFB(EN)
Enable Turn-on Voltage
COMP THRESHOLD VOLTAGE SECTION
VCOMP
Turn-on Threshold Voltage
3.42
7
3.60
8
3.78
9
V
V
PROTECTION SECTION
VFB(OVP)
Over Voltage Protection
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
5
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Typical Performance Characteristics
100
90
80
70
60
50
40
30
20
19.5
19.0
18.5
18.0
17.5
17.0
16.5
RBIAS=200kΩ
RBIAS=200kΩ
-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
800
750
700
650
600
550
500
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
450
RBIAS=200kΩ
400
-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
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
6
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Typical Performance Characteristics (Continued)
120
110
100
90
80
70
60
50
40
30
20
10
0
80
70
60
TA=25oC
150
TA=25oC
150
50
40
100
200
250
300
350
400
100
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
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
7
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Operation Description
Bridge
Vg
VS
VO
D1
VIN
+
IS
+
C1
CO
IO
NP
NS
LM
VAUX
NAUX
Q1
OUT
AP3706
IP
FB
GND
CS
RCS
Figure 10. Simplified Flyback Converter Controlled by AP3706
Figure 10 illustrates a simplified flyback converter
controlled by AP3706.
The energy stored in the magnetizing inductance LM
each cycle is therefore:
Constant Primary Peak Current
The primary current ip(t) is sensed by a current sense
1
................(3)
Eg = ×LM ⋅ Ipk2
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 the fsw is the switching frequency. When the
peak current Ipk is constant, the output power depends
on the switching frequency fsw.
See equation 2
Constant Voltage Operation
Ip
The AP3706 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:
0A
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
................(5)
Vcs
VAUX
=
×
(
Vo +Vd
)
................(2)
Ipk =
NS
Rcs
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
8
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Operation Description (Continued)
Where the 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
................(8)
Ipks =
× Ipk
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. The diode
drop voltage 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 at two-thirds of the D1 on-time. The
CV loop control function of AP3706 then generates a
D1 off-time to regulate the output voltage.
NP
NP
2
1
Tons
Iout = ×
2 NS
×Ipk×
= ×
×Ipk
Tons+Toffs 7 NS
................(9)
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
The AP3706 is designed to work in constant-current
(CC) mode. Figure 13 shows the secondary current
waveforms.
See equation 8
CCM Protection
The AP3706 is designed to operate in discontinuous
conduction mode (DCM) in both CV and CC modes.
To avoid operating in continuous conduction mode
(CCM), the AP3706 detects the falling edge of the FB
input voltage on each cycle. If a 0.1V falling edge of
FB is not detected, the AP3706 will stop switching.
Iout
Is
0A
Toffs
Tons
Figure 13. Secondary Current Waveform
OVP & OCkP
The AP3706 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 AP3706 will immediately shut off and
enters hiccup mode. The AP3706 sends out a fault
detection pulse every 8ms in hiccup mode until the
fault has been removed.
In CC operation, the CC loop control function of
AP3706 will keep a fixed proportion between D1 on-
time Tons and D1 off-time Toffs by discharging or
charging the capacitance connected in COMP pin. The
fixed proportion is
Tons
Toffs
4
3
=
................(6)
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
9
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Operation Description (Continued)
FB
COMP
pro
8V
R
S
Q
COMP
-0.7V
Timer_8ms
UVLO
Figure 14. OVP and OCkP Function Block
Typical Application
Bridge
D2
5V/1A
T1
VO+
+
+
R1
C6
C1
+
J1
D1
C2
Z1
R6
AC 85-264V
VO-
R2
R3
Q1
VCC
CS
OUT
R9
C5
AP3706
BIAS
FB
GND COMP VDD
R7
R10
R11
R8
R4
R5
C3
C4
Figure 15. 5V/1A Output for Battery Charger of Mobile Phone
BCD Semiconductor Manufacturing Limited
Jul. 2008 Rev. 1.3
10
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Mechanical Dimensions
SOIC-8
Unit: mm(inch)
4.700(0.185)
0.320(0.013)
1.350(0.053)
5.100(0.201)
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
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)
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
11
Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
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)
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
12
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