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Número de pieza | FAN7602B | |
Descripción | Green Current-Mode PWM Controller | |
Fabricantes | Fairchild Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de FAN7602B (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
No Preview Available ! FAN7602B
Green Current-Mode PWM Controller
March 2007
Features
Green Current-Mode PWM Control
Fixed 65kHz Operation
Internal High-Voltage Start-up Switch
Burst-Mode Operation
Line Voltage Feedforward to Limit Maximum Power
Line Under-Voltage Protection
Latch Protection & Internal Soft-Start (10ms) Function
Overload Protection
Over-Voltage Protection
Low Operation Current: 1mA Typical
8-pin DIP/SOP
Applications
Adapter
LCD Monitor Power
Auxiliary Power Supply
Description
The FAN7602B is a green current-mode PWM controller.
It is specially designed for off-line adapter applications;
DVDP, VCR, LCD monitor applications; and auxiliary
power supplies.
The internal high-voltage start-up switch and the burst-
mode operation reduce the power loss in standby mode.
As a result, it is possible to supply 0.5W load, limiting the
input power under 1W when the input line voltage is
265VAC. On no-load condition, input power is under 0.3W.
The maximum power can be limited constantly, regard-
less of the line voltage change, using the power limit
function.
The switching frequency is internally fixed at 65kHz.
The FAN7602B includes various protections for the sys-
tem reliability and the internal soft-start prevents the out-
put voltage over-shoot at start-up.
Related Application Notes
www.DataSheet4U.com
AN6014 - Green Current Mode PWM Controller
FAN7602
Ordering Information
Part Number
FAN7602BN
FAN7602BM
FAN7602BMX
Operating Temp.
Range
Pb-Free
-25°C to +125°C
Yes
Package
8-DIP
8-SOP
Packing Method
Rail
Rail
Tape & Reel
Marking
Code
FAN7602B
FAN7602B
FAN7602B
© 2007 Fairchild Semiconductor Corporation
FAN7602B Rev. 1.0.0
www.fairchildsemi.com
1 page Electrical Characteristics
VCC = 14V, TA = -25°C~125°C, unless otherwise specified
Symbol
Parameter
Condition
Min.
START UP SECTION
ISTR
VSTR Start-up Current
UNDER VOLTAGE LOCK OUT SECTION
Vth(start)
Vth(stop)
HY(uvlo)
Start Threshold Voltage
Stop Threshold Voltage
UVLO Hysteresis
SUPPLY CURRENT SECTION
VSTR = 30V, TA = 25°C
VCC increasing
VCC decreasing
0.7
11
7
3.6
ISTR Start-up Supply Current
ICC Operating Supply Current
SOFT-START SECTION
tSS Soft-Start Time(1)
PWM SECTION
fOSC
Operating Frequency
VCS/FB1
tD
CS/FB Threshold Voltage
Propagation Delay to Output(1)
DMAX Maximum Duty Cycle
DMIN Minimum Duty Cycle
BURST MODE SECTION
VCS/FB2 Burst On Threshold Voltage
VCS/FB3 Burst Off Threshold Voltage
POWER LIMIT SECTION
KPlimit Offset Gain
OUTPUT SECTION
VOH Output Voltage High
VOL Output Voltage Low
tR Rising Time(1)
tF Falling Time(1)
PROTECTION SECTION
TA = 25°C
Output no switching
VCS/FB = 0.2V, TA = 25°C
TA = 25°C
5
59
0.9
70
TA = 25°C
TA = 25°C
0.84
0.77
VLatch/Plimit = 2V, TA = 25°C
0.12
TA = 25°C, Isource = 100mA
TA = 25°C, Isink = 100mA
TA = 25°C, CL = 1nF
TA = 25°C, CL= 1nF
11.5
VLatch
tOLP
tOLP_ST
VOLP
VLUVPoff
VLUVPon
VOVP
Latch Voltage
Overload Protection Time (1)
Overload Protection Time at Start-
up
Overload Protection Level
Line Under-Voltage Protection On
to Off
Line Under-Voltage Protection Off
to On
Over-Voltage Protection
TA = 25°C
TA = 25°C
TA = 25°C
3.6
20
30
1.9
1.4
18
Note:
1. These parameters, although guaranteed by design, are not tested in production.
Typ.
1.0
12
8
4.0
250
1.0
10
65
1.0
100
75
0.95
0.88
0.16
12.0
1.0
45
35
4.0
22
37
0
2.0
1.5
19
Max. Unit
1.4 mA
13 V
9V
4.4 V
320 μA
1.5 mA
15 ms
73 kHz
1.1 V
150 ns
80 %
0%
1.06 V
0.99 V
0.20
14.0 V
2.5 V
150 ns
150 ns
4.4 V
24 ms
44 ms
0.1 V
2.1 V
1.6 V
20 V
© 2007 Fairchild Semiconductor Corporation
FAN7602B Rev. 1.0.0
5
www.fairchildsemi.com
5 Page Typical Application Circuit
Application
Adapter
Output Power
48W
Input Voltage
Universal input (85~265VAC)
Output Voltage
12V
Features
Low stand-by power (<0.3W at 265VAC)
Constant output power control
Key Design Notes
All the IC-related components should be placed close to IC, especially C107 and C110.
If R106 value is too low, there can be subharmonic oscillation.
R109 should be designed carefully to make VCC voltage higher than 8V when the input voltage is 265VAC at no load.
R110 should be designed carefully to make VCC voltage lower than OVP when the input voltage is 85VAC at full load.
R103 should be designed to keep the MOSFET VDS voltage lower than maximum rating when the output is shorted.
1. Schematic
R206 C204
D202
BD101
C103 C104
C102
R101
C101
FUSE
AC INPUT
C105
R112
R113
C110
R107
C107
1 T1 12
D204
L201
R114
D101
3
Q101
R105
R102
1 LUVP
2 Latch/
Plimit
3 CS/FB
4 GND
VSTR
NC
8
7
VCC
Out
6
5
IC101
R104
D103
C201
9
6 D102 R109 R110
C109
5
ZD101
OP1
41
32
C222
R202
R203 C203
3
IC201
1
R111
2
C202
R204
R205
R108
4 OP2
3
C108
1
2
R207
ZD201
Figure 25. Schematic
© 2007 Fairchild Semiconductor Corporation
FAN7602B Rev. 1.0.0
11
www.fairchildsemi.com
11 Page |
Páginas | Total 17 Páginas | |
PDF Descargar | [ Datasheet FAN7602B.PDF ] |
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