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Электронный компонент: FAN7601M

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2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
Green Current Mode PWM Control
Low Operating Current: Max 4mA
Burst Mode Operation
Internal High Voltage Start-up Switch
Under Voltage Lockout (UVLO): 12V/8V
Latch Protection & Soft Start Function
Over Voltage Protection: 19V
Operating Frequency up to 300kHz
Max Duty Cycle: 95%
Typical Applications
Off-Line Adapter Applications
Auxiliary Power Supplies
Description
The FAN7601 is a green programmable frequency current
mode PWM controller. It is specially designed for the
off-line adapter application and the auxiliary power supplies
which require high efficiency at a light load and no load.
The internal high voltage start-up switch and the burst mode
reduce the power loss. The FAN7601 includes some
protections such as latch protection and over voltage
protection. The latch protection can be used for over voltage
protection and/or thermal protection and so on. And the soft
start prevents the output voltage over shoot at start up.
8-SOP
1
8-DIP
1
10-SSOP
1
Internal Block Diagram
* ( ) is 10-SSOP PIN Number
Latch/SS
Delay Circuit
1V
Enable
+
-
-
GND
(6)
Start-up
Circuit
2.5V
1.5V
Start-up
Circuit
5V Ref
Vcc
(8)
Vref (10)
Rt/Ct
(5)
Latch/SS
(4)
OUT
(7)
CS/FB
(3)
UVLO
12uA
Vref
7
19V
OVP
+
-
+
-
12V/8V
6
2
+
-
0.97V/0.9V
1
8
R
Q
S
OSC
4
3
+
-
OVP
R
Q
S
Reset
Circuit
+
-
5
Vstr (1)
1V
FAN7601
Green Current Mode PWM Controller
FAN7601
2
Pin Assignments
Pin Definitions
*( ) is 10-SSOP PIN Number
Pin Number
Pin Name
Pin Function Description
1 (1)
Vstr
Start-up
2 (3)
CS/FB
Current Sense and Feedback
3 (4)
Latch/SS
Latch Protection and Soft Start
4 (5)
Rt/Ct
Oscillator Timing
5 (6)
GND
Ground
6 (7)
Out
Gate Drive Output
7 (8)
V
CC
IC Power Supply
8 (10)
V
ref
Voltage Reference
FAN7601
1
2
6
5
8
7
YWW
3
4
CS/FB
Rt/Ct
Latch/SS
Vstr
Vref
Vcc
Out
GND
8-DIP, 8-SOP
10-SSOP
7601
1
2
7
6
10
8
YWW
4
5
CS/FB
Rt/Ct
Latch/SS
Vstr
Vref
Vcc
Out
GND
3
NC
9
NC
FAN7601
3
Absolute Maximum Ratings
(Ta = 25
C, unless otherwise specified)
Characteristics
Symbol
Value
Unit
Supply Voltage
V
CC
20
V
Input Voltage CS/FB
V
CS/FB
-0.3 to 20
V
Operating Temperature
T
OPR
-25 to +125
C
Storage Temperature
T
STG
-55 to +150
C
Junction Temperature
Tj
150
C
Output Current
I
O
250
mA
Vstr Input Voltage
Vstr
500
V
ESD Capability, HBM Model
(All pins except Vcc and Vstr)
-
2.0
kV
ESD Capability, Machine Model
-
300
V
Thermal Resistance, Junction to Air
8-DIP
R
ja
100
C/W
8-SOP
180
10-SSOP
130
FAN7601
4
Electrical Characteristics
(T
a
= -25
C ~ 125
C, Vcc = 14V, Rt = 9.5k
, Ct = 2.2nF unless otherwise specified)
Note:
1. These parameters, although guaranteed, are not 100% tested in production.
Characteristics
Symbol
Conditions
Min.
Typ.
Max.
Unit
REFERENCE SECTION
Reference Output Voltage
V
ref
I
O
= 1mA
4.85
5.00
5.15
V
Line Regulation
V
ref1
V
CC
= 10V ~ 18V
-
10
20
mV
Load Regulation
V
ref2
I
O
= 1mA ~ 10mA
-
20
30
mV
OSCILLATOR SECTION
Initial Accuracy
F
OSC
-
90
100
110
kHz
Voltage Stability
ST
V
V
CC
= 10V ~ 18V
-
1.0
1.5
%
Amplitude
V
OCS
V
pin4 peak-to-peak
-
1.25
-
V
PWM SECTION
CS/FB Threshold Voltage1
V
CS/FB1
-
0.9
1.0
1.1
V
Maximum Duty Cycle
D
MAX
Ta = 25
C
92
95
98
%
Minimum Duty Cycle
D
MIN
-
-
-
0
%
BURST MODE SECTION
CS/FB Threshold Voltage2
(1)
V
CS/FB2
-
0.77
0.97
1.17
V
CS/FB Threshold Voltage3
(1)
V
CS/FB3
-
0.7
0.9
1.1
V
SOFT START SECTION
Soft Start Current
I
SS
V
pin3
= GND
9
12
15
A
Soft Start Limit Voltage
V
SL
I
SS
= 1
A
1.2
1.5
1.8
V
PROTECTION SECTION
Latch Voltage
V
LATCH
-
2.25
2.5
2.75
V
Over Voltage Protection
V
OVP
-
18
19
20
V
UVLO SECTION
Start Threshold Voltage
V
tH
-
11
12
13
V
Minimum Operating Voltage
V
tL
-
7
8
9
V
TOTAL CURRENT SECTION
Operating Supply Current
I
OP
-
-
3
4
mA
OUTPUT SECTION
Low Output Voltage
V
OL
Ta =25
C, I
O
= 100mA
-
2
2.5
V
High Output Voltage
V
OH
Ta =25
C, I
O
= -100mA
11.5
12
14
V
Rising Time
(1)
T
r
Ta =25
C, CI = 1nF
-
45
150
ns
Falling Time
(1)
T
f
Ta =25
C, CI = 1nF
-
35
150
ns
START UP SECTION
VSTR Start-up Current
I
str
V
str
= 30V, Ta =25
C
0.5
1
1.5
mA
FAN7601
5
Typical Performance Characteristics
-50
0
50
100
150
4.85
4.90
4.95
5.00
5.05
5.10
5.15
Vr
e
f
(
V
)
Junction Temperature (
C)
-50
0
50
100
150
2.0
2.2
2.4
2.6
2.8
3.0
S
u
p
p
l
y
C
u
rr
e
n
t

I
c
c
(m
A
)
Junction Temperature (
C)
-50
0
50
100
150
11.0
11.5
12.0
12.5
13.0
V
c
c

S
t
a
r
t
T
h
re
s
h
o
l
d

V
t
H
(V
)
Junction Temperature (
C)
-50
0
50
100
150
7.0
7.5
8.0
8.5
9.0
Vc
c
St
o
p
T
h
r
e
s
h
o
l
d
Vt
L
(
V
)
Junction Temperature (
C)
-50
0
50
100
150
90
95
100
105
110
O
s
c
illa
t
o
r
F
r
e
q
u
e
n
c
y

F
o
s
c
(
k
H
z
)
Junction Temperature (
C)
-50
0
50
100
150
90
92
94
96
98
100
Ma
x
i
mu
m D
u
t
y
C
y
c
l
e

D
m
a
x

(
%
)
Junction Temperature (
C)
Figure 1. Trimmed Reference Voltage
Figure 2. Supply Current
Figure 3. Vcc Start Threshold Voltage
Figure 4. Vcc Stop Threshold Voltage
Figure 5. Oscillator Frequency
Figure 6. Maximum Duty Cycle