FAN7556M [FAIRCHILD]

SMPS Controller ; SMPS控制器\n
FAN7556M
型号: FAN7556M
厂家: FAIRCHILD SEMICONDUCTOR    FAIRCHILD SEMICONDUCTOR
描述:

SMPS Controller
SMPS控制器\n

控制器
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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