FAN7556M [FAIRCHILD]
SMPS Controller ; SMPS控制器\n
| 型号： | FAN7556M |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | SMPS Controller
|
| 文件： | 总10页 (文件大小：244K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN7556
Voltage Mode PWM Controller
Features
Description
• Voltage Mode Control
The FAN7556 is a fixed frequency voltage mode PWM
controller. It is specially designed for off-line and DC-DC
converter applications with minimal external components.
These integrated circuits feature a trimmed oscillator for
precise duty cycle control, a temperature compensated
reference, an on/off control, a high gain error amplifier, a
current sensing comparator, and a high current totem-pole
output. The FAN7556 has various protection functions such
as an over load protection (OLP), an over current
protection(OCP), and an over voltage protection(OVP). The
FAN7556 is available in the 8DIP package as well as the
8SOP package.
• Pulse by Pulse Current Limiting
• Low External Components
• Under Voltage Lockout ( UVLO): 9V/15V
• Stand-by Current: Typ. 100uA
• Power Saving Mode Current: Typ. 200uA
• Operating Current: Typ. 7mA
• Soft Start
• On/off Control
• Over Load Protection (OLP)
• Over Current Protection (OCP)
• Over Voltage Protection (OVP)
• Wide Operating Frequency Range (20kHz ~ 500kHz)
• Auto-Restart Function
8-DIP
1
Applications
• Off-Line & DC-DC Converter
8-SOP
1
Internal Block Diagram
CT
Vcc
7
6
OVP
COM
+
+
3.5V
1
LA
S/S
_
+
_
2V
S
R
_
34V
Q
off
on
UVLO
Vref
+
PWR
/
SAVE
Vref
100uA
_
_
8
15/9V
+
1k
1.5V
CLK
+
0.3V
OSC
_
14V
5
OUT
PWM
+
_
_
2
FB
1mA
3k
2.7V
OCP
R
S
Vref
Vcc
+
Q
I S
3
4
_
0.25V
5uA
OLP
+
S
Q
_
6V
UVLO-out
R
COM-out
OVP-out
GND
Rev. 1.0.1
©2002 Fairchild Semiconductor Corporation
FAN7556
Absolute Maximum Ratings
( Ta = 25°C, unless otherwise specified )
Parameter
Symbol
Value
30
Unit
V
Supply Voltage
Vcc
Output Current
I
O
±1
A
Input Voltage to FB Pin
Input Voltage to IS Pin
V
V
V
FB
SD
V
-0.3 to V
V
IS
OC
Power Dissipation (Ta ≤ 25°C)
8-DIP
8-SOP
P
0.85
0.62
W
D
Operating Temperature
Storage Temperature
T
-25 to +125
-55 to +150
°C
°C
OPR
T
STG
Thermal Resistance, Junction-to-Air(Note1)
8-DIP
8-SOP
Rθja
147.1
201.6
°C/W
Note:
1. Junction -to -air thermal resistance test environments.
-. Pneumatic heat sink fixture.
-. Clamping pressure 60psi through 12mm diameter cylinder.
-. Thermal grease applied between PKG and heat sink fixture
Temperature Characteristics
( -25°C ≤ Ta ≤ 125°C )
Parameter
Symbol
∆F
Value
Unit
Fosc Temperature Stability
2
±5
%
OSC
2
FAN7556
PIN Array
S/S
8
CT
7
Vcc
6
OUT
5
YWW
F AN7 5 5 6
3
2
4
1
LA
IS
GND
FB
YWW : Work Week Code
PIN Definitions
Pin Number
Pin Name
Pin Function Description
1
2
3
4
5
6
7
8
LA
FB
Optional Protection
Inverting (-) Input of PWM Comparator, ON/OFF Control & Over Load Sensing
IS
Over Current Sensing
Ground
GND
OUT
Vcc
CT
Output of Gate Driver
Power Supply
Oscillator Timing Capacitor Ct
Soft Start
S/S
3
FAN7556
Electrical Characteristics
(Ta = 25°C, Vcc=18V, Ct=1nF unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
< OSCILLATOR SECTION >
Oscillator Frequency
F
∆F
∆F
T =25°C, Ct=1nF
90
-
100
±1
110
kHz
%
OSC
j
Frequency Change With Vcc
Temperature Stability (Note1)
< PWM SECTION >
Vcc=10V~30V
-25°C ≤ Ta ≤ 125°C
-
-
OSC1
OSC2
-
±5
%
FB Source Current
I
V
= 0V, V
S/S
= 5V
= 0V
-
-
1.0
0.85
2.7
74
-
-
mA
V
FB
FB
Duty = 0%
Duty = D
FB Threshold Voltage 1
FB Threshold Voltage 2
Maximum Duty Cycle
< SOFT START SECTION >
Soft Start Current
V
V
TH(FBO)
TH(FBM)
-
-
V
MAX
D
MAX
-
70
78
%
I
V
V
= 5V, V
> 5V
-
-
1.1
5.2
-
-
mA
V
S/S
FB
FB
S/S
Soft Start Limit Voltage
< PROTECTION SECTION >
Shutdown Feedback Voltage
Shutdown Delay Current
Over Current Protection
Over Voltage Protection
Comparator Threshold Voltage
<UVLO SECTION>
V
-
LIM(S/S)
V
5.4
3.5
0.22
30
6
5
6.6
6.5
0.29
38
V
uA
V
SD
I
4V ≤ V ≤ V
FB
SD
SD
-
V
0.26
34
2
OC
V
V
= 3V, V
S/S
= 5V
V
OVP
FB
V
-
1.7
2.3
V
LA
Start Threshold Voltage
Min. Operating Voltage
< ON/OFF CONTROL SECTION >
On Threshold Voltage
Off Threshold Voltage
Sink Current
V
-
-
13.2
8.2
14.7
9.2
16.2
10.2
V
V
TH(ST)
V
OPR(MIN)
V
V
V
V
= 0V
0.2
1.2
3
0.3
1.5
4
0.4
1.8
5
V
V
ON
IS
V
< V
< V
OFF
FB
FB
ON
TH(FB) S/S
I
, V
= 5V
mA
SINK
<OUTPUT SECTION>
Low Output Voltage1
Low Output Voltage2
High Output Voltage1
High Output Voltage2
Rise Time (Note1)
V
V
Io = 50mA
Io = 200mA
Io = -50mA
-
-
0.15
1.5
15
0.4
2.5
17
16
-
V
V
OL1
OL2
OH1
OH2
V
V
13
12
-
V
I
= -200mA
14
V
O
T
C = 1nF, (No load)
L
80
ns
ns
R
Fall Time (Note1)
T
C = 1nF, (No load)
L
-
40
-
F
< OVERALL SECTION >
Start-Up Current
V
-
-
-
-
0.1
7
0.2
10
mA
mA
mA
ST
Operating Supply Current
Off State Current
I
Vcc ≤ 30V
OP
I
V
< V
, V
TH(FB) S/S
< V
OFF
0.2
0.4
OFF
FB
Note:
1. These parameters, although guaranteed, are not 100% tested in production.
4
FAN7556
Typical Performance Characteristics
Figure 2. Frequency vs. Ambient Temperature
Figure 1. Operating Current vs. Ambient Temperature
Figure 3. Output Duty Cycle vs. Ambient Temperature
Figure 4. Output Duty Cycle vs. Timing Capacitor
Figure 5. Output Duty Cycle vs. Frequency
Figure 6. Frequency vs. Timing Capacitor
5
FAN7556
Typical Performance Characteristics (Continued)
Figure 7. Output Duty Cycle vs. FB Terminal Voltage
6
FAN7556
Mechanical Dimensions
Package
Dimensions in millimeters
8-DIP
7
FAN7556
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
8-SOP
0.1~0.25
MIN
0.004~0.001
1.55 ±0.20
0.061 ±0.008
#8
#5
#1
#4
6.00 ±0.30
0.236 ±0.012
1.80
0.071
MAX
3.95 ±0.20
0.156 ±0.008
5.72
0.225
0.50 ±0.20
0.020 ±0.008
8
FAN7556
Ordering Information
Product Number
FAN7556N
Package
8-DIP
Operating Temperature
Packing
Tube
FAN7556M
8-SOP
8-SOP
-25°C ~ 125°C
Tube
FAN7556MX
Tape&Reel
9
FAN7556
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
11/12/02 0.0m 001
Stock#DSxxxxxxxx
2002 Fairchild Semiconductor Corporation
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