FAN7601 Fairchild Semiconductor, FAN7601 Datasheet

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FAN7601

Manufacturer Part Number
FAN7601
Description
The FAN7601 is a green programmable frequency current mode PWM controller
Manufacturer
Fairchild Semiconductor
Datasheet

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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
Internal Block Diagram
©2005 Fairchild Semiconductor Corporation
FAN7601
Green Current Mode PWM Controller
Latch/SS
Rt/Ct
(4)
GND
(5)
(6)
* ( ) is 10-SSOP PIN Number
4
3
5
1V
Vref
OSC
2.5V
12uA
+
+
Start-up
Circuit
Vref (10)
1.5V
OVP
8
5V Ref
R
R
S
S
Circuit
Enable
Reset
Q
Q
Vstr (1)
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.
1
Delay Circuit
10-SSOP
1
Start-up
Circuit
UVLO
+
OVP
8-SOP
+
0.97V/0.9V
+
12V/8V
+
1
1V
www.fairchildsemi.com
Latch/SS
19V
8-DIP
7
6
2
Vcc
OUT
CS/FB
(8)
(7)
1
(3)
Rev. 1.0.2

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FAN7601 Summary of contents

Page 1

... 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 ...

Page 2

... FAN7601 Pin Assignments 8-DIP, 8-SOP Vref Vcc 8 7 FAN7601 1 2 Vstr CS/FB Latch/SS Pin Definitions Pin Number Pin Name 1 (1) Vstr 2 (3) CS/FB 3 (4) Latch/SS 4 (5) Rt/Ct 5 (6) GND 6 (7) Out 7 ( (10 10-SSOP PIN Number 2 Out GND 6 5 YWW 3 4 Rt/Ct Start-up Current Sense and Feedback ...

Page 3

... Vcc and Vstr) ESD Capability, Machine Model Thermal Resistance, Junction to Air Symbol CS/FB T OPR T STG Vstr - - 8-DIP 8-SOP Rθja 10-SSOP FAN7601 Value Unit °C -25 to +125 °C -55 to +150 °C 150 250 mA 500 V 2.0 kV 300 V 100 ° ...

Page 4

... FAN7601 Electrical Characteristics (T = -25°C ~ 125°C, Vcc = 14V 9.5kΩ 2.2nF unless otherwise specified) a Characteristics REFERENCE SECTION Reference Output Voltage Line Regulation Load Regulation OSCILLATOR SECTION Initial Accuracy Voltage Stability Amplitude PWM SECTION CS/FB Threshold Voltage1 Maximum Duty Cycle Minimum Duty Cycle ...

Page 5

... Figure 4. Vcc Stop Threshold Voltage 100 100 150 ° 100 Junction Tem perature ( ° C) Figure 2. Supply Current - 100 Junction Tem perature ( ° - 100 Junction Tem perature ( ° C) Figure 6. Maximum Duty Cycle FAN7601 150 150 150 5 ...

Page 6

... FAN7601 Typical Performance Characteristics 2.7 2.6 2.5 2.4 2.3 - Junction Tem perature ( Figure 7. Oscillator High Threshold Voltage 150 120 - Junction Tem perature ( Figure 9. Output Rising Time 2.0 1.6 1.2 0.8 0.4 0.0 - Junction Tem perature ( Figure 11. Start-up Current 6 (Continued) 1.35 1.30 1.25 1.20 1.15 100 150 ° C) Figure 8. Oscillator Low Threshold Voltage ...

Page 7

... Figure 13. Latch Protection Voltage 1000 100 (Continued) 100 150 ° Ω Figure 15. Oscillator Frequency Characteristic - 100 ° Junction Tem perature ( C) Figure 14. Soft Start Current Ct= 680pF 820pF 1nF 2.2nF 3.3nF 4.7nF 8.2nF 10nF 40 50 FAN7601 150 7 ...

Page 8

... FAN7601 Mechanical Dimensions 8 8DIP ...

Page 9

... Mechanical Dimensions (Unit: mm) Package #1 #4 6.00 0.236 3.95 0.156 0.50 0.20 0.020 0.008 (Continued) 8-SOP 1.55 0.20 0.061 0.008 #8 #5 0.30 1.80 MAX 0.012 0.071 0.20 0.008 5.72 0.225 FAN7601 0.1~0.25 MIN 0.004~0.001 9 ...

Page 10

... FAN7601 Mechanical Dimensions (Unit: mm) Package 10 (Continued) 10-SSOP-225 ...

Page 11

... Ordering Information Device Package FAN7601N 8-DIP FAN7601M 8-SOP FAN7601G 10-SSOP Operating Temp. -25°C ~ 125°C FAN7601 11 ...

Page 12

... FAN7601 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. ...

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