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FAN7601B - Green Current Mode PWM Controller
February 2009
FAN7601B Green Current Mode PWM Controller
Features
Green Current Mode PWM Control Low Operating Current: Maximum 4mA Burst Mode Operation Internal High-Voltage Startup Switch Under-Voltage Lockout (UVLO): 12V8V Latch Protection and Soft-Start Function Over-Voltage Protection: 19V Operating Frequency up to 300kHz
Description
The FAN7601B is a programmable frequency green current mode PWM controller. It is specially designed for the offline adapter applications and the auxiliary power supplies that require high efficiency at light load and no load. The internal high-voltage startup switch and burst mode reduce the power loss. FAN7601B includes protections, such as latch protection and over-voltage protection. The latch protection can be used for over-voltage protection, thermal protection, and others. The soft-start prevents the output voltage overshoot at startup.
Maximum Duty Cycle: 95
Applications
Offline Adapter Applications Auxiliary Power Supplies
Related Resources
AN4129 - Green Current Mode PWM Controller FAN7601
Ordering Information
Part Number
Operating Junction Temperature
Top Mark
FAN7601B 7601B 7601B 7601B 7601B
Eco Status
Package
8-DIP 8-SOP
Packing Method
Rail Rail Tape Reel Rail Tape Reel
8-SOP 10-SSOP 10-SSOP
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FAN7601B - Green Current Mode PWM Controller
Block Diagram
Figure 1. Internal Block Diagram
( ) is 10-SSOP Pin Number
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FAN7601B - Green Current Mode PWM Controller
Pin Configurations
Figure 2. 8-Pin Configuration (Top View)
Figure 3. 10-Pin Configuration (Top View)
Pin Definitions
Pin (8-Pin)
Pin (10-Pin)
Vstr CSFB LatchSS RtCt GND Out Vcc Vref
Description
Startup Current Sense and Feedback Latch Protection and Soft-Start Oscillator Timing Ground Gate Drive Output IC Power Supply Voltage Reference
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FAN7601B - Green Current Mode PWM Controller
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
Symbol
Parameter
Recommended Operating Junction Temperature Output Current VSTR Input Voltage Electrostatic Discharge Capability, Human Body Model JESD22-A114 (All pins except Vstr pin) Electrostatic Discharge Capability, Machine Model, JESD22-A115
Thermal Impedance
Symbol
Parameter
8-DIP Thermal Resistance, Junction-to-Ambient 8-SOP 10-SSOP
Value
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FAN7601B - Green Current Mode PWM Controller
Electrical Characteristics
Symbol
Reference Section VREF VREF1 VREF2 fOSC STV VOSC VCSFB1 DMAX DMIN VCSFB2 VCSFB3 ISS VSL VLATCH VOVP VtH VtL IOP VOL VOH tr tf
Parameter
Reference Output Voltage Line Regulation Load Regulation Initial Accuracy Voltage Stability Amplitude CSFB Threshold Voltage1 Maximum Duty Cycle Minimum Duty Cycle CSFB Threshold Voltage2 CSFB Threshold Voltage3 Soft-Start Current Soft-Start Limit Voltage Latch Voltage Over-Voltage Protection Start Threshold Voltage Minimum Operating Voltage Operating Supply Current Low Output Voltage High Output Voltage Rising Time
Conditions
Burst Mode Section
Soft-Start Section
Protection Section
UVLO Section
Falling Time
Notes: 1. These parameters, although guaranteed, are not 100 tested in production. 2. It is recommended to connect a 1M resistor between the LatchSS pin and GND to prevent abnormal operation of the latch protection by noise coupling.
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FAN7601B - Green Current Mode PWM Controller
Typical Performance Characteristics
Supply Cur r ent Icc (mA)
5.03 Vref (V) 5.01 4.99 4.97 4.95 -45 -25 -15 0 25 50 80 100 125 140
Junction Temperature()
Figure 4. Trimmed Reference Voltage
Vcc Star t Thr eshold VtH (V)
Vcc Stop Thr eshold VtL (V)
Figure 5. Supply Current
Junction Temperature()
Figure 6. VCC Start Threshold Voltage
110 Oscillator Frequency Fosc (KHz) 105 100 95 90 85 -45 -25 -15 0 25 50 80 100 125 140
Max im um Duty Cy cle Dm ax ()
Figure 7. VCC Stop Threshold Voltage
Junction Temperature()
Figure 8. Oscillator Frequency
Oscillator High Threshold Vr H (V)
O scillator L ow Thr eshold Vr L (V)
Figure 9. Maximum Duty Cycle
Junction Temperature()
Figure 10. Oscillator High Threshold Voltage
Figure 11. Oscillator Low Threshold Voltage
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FAN7601B - Green Current Mode PWM Controller
Typical Performance Characteristics (Continued)
Over Voltage Protection Vovp (V)
2 1.6 1.2 0.8 0.4 0 -4 5 -25 -15 0 25 50 80 100 125 140 Junction Temperature()
20 19.6 19.2 18.8 18.4 18 -45 -25 -15 0 25 50 80 100 125 140 Junction Temperature()
Figure 12. Startup Current
Figure 13. Over-Voltage Protection Level
2.8 Latch P rotection Vlatch ( V)
Soft Start Curren t Isof (uA)
2.7 2.6 2.5 2.4 2.3 2.2 -45 -25 -15 0 25 50 80 100 125 140 Junction Temperature( )
-45 -25 -15 0 25 50 80 100 125 140 Junction Temperature()
Figure 14. Latch Protection Voltage
Figure 15. Soft-Start Current
10nF Frequen cy KHz 100 8.2nF 4.7nF 3.3nF 2.2nF 1nF 10 820pF 680pF
1 5K 15K 25K RtKohm 35K 45K
Figure 16. Oscillator Frequency Characteristic
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FAN7601B - Green Current Mode PWM Controller
Physical Dimensions
.400 10.15 .373 9.46 .036 0.9 TYP
C .021 0.53 .015 0.37
.015 MIN 0.38 .140 3.55 .125 3.17 .100 2.54
.300 7.62 .430 MAX 10.92 .060 MAX 1.52 .010+.005 0.254+0.127 -.000 -0.000
NOTES:
A. CONFORMS TO JEDEC REGISTRATION MS-001, VARIATIONS BA B. CONTROLING DIMENSIONS ARE IN INCHES REFERENCE DIMENSIONS ARE IN MILLIMETERS C. DOES NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCHES OR 0.25MM. D. DOES NOT INCLUDE DAMBAR PROTRUSIONS. DAMBAR PROTRUSIONS SHALL NOT EXCEED .010 INCHES OR 0.25MM. E. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994.
N08EREVG
Figure 17. 8-Lead, Dual In-line Package (DIP)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision andor date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchilds worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductors online packaging area for the most recent package drawings: http:www.fairchildsemi.compackaging.
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FAN7601B - Green Current Mode PWM Controller
Physical Dimensions
PIN ONE INDICATOR
LAND PATTERN RECOMMENDATION
0.25 0.10 1.75 MAX
SEE DETAIL A
OPTION A - BEVEL EDGE
R0.10 R0.10
GAGE PLANE
OPTION B - NO BEVEL EDGE
NOTES: UNLESS OTHERWISE SPECIFIED A) THIS PACKAGE CONFORMS TO JEDEC MS-012, VARIATION AA, ISSUE C, B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M. E) DRAWING FILENAME: M08AREV13
SEATING PLANE
DETAIL A
SCALE: 2:1
Figure 18. 8-Lead, Small Outline Package (SOP)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision andor date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchilds worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductors online packaging area for the most recent package drawings: http:www.fairchildsemi.compackaging.
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FAN7601B - Green Current Mode PWM Controller
Physical Dimensions
1 PIN ONE INDICATOR TOP VIEW
LAND PATTERN RECOMMENDATION SEE DETAIL A R0.20 0.30 0.15
1.80 MAX 0.25 0.10 (0.26) 0.506 0.306 SIDE VIEW R0.15
NOTES: A) NO DRAWING STANDARD APPLIES TO THIS PACKAGE B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR EXTRUSIONS. 0.70 D) LAND PATTERN RECOMMENDATION IS FSC SOURCED. E) DRAWING FILE NAME AND REVISION : MKT-MSB10A, REV1 0.30
END VIEW
R0.15
SCALE: 2:1
SEATING PLANE
Figure 19. 10-Lead, Small Outline Package (SSOP)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision andor date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchilds worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductors online packaging area for the most recent package drawings: http:www.fairchildsemi.compackaging.
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FAN7601B - Green Current Mode PWM Controller
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