FAN6862L Fairchild Semiconductor, FAN6862L Datasheet

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FAN6862L

Manufacturer Part Number
FAN6862L
Description
A highly integrated PWM controller, FAN6862R/L provides several features to enhance the performance of flyback converters
Manufacturer
Fairchild Semiconductor
Datasheet
© 2009 Fairchild Semiconductor Corporation
FAN6862R/L • Rev. 1.0.0
FAN6862R / FAN6862L
Highly Integrated Green-Mode PWM Controller
Features
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
Ordering Information
Part Number
FAN6862RTY
FAN6862LTY
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
Low Startup Current: 8µA
Low Operating Current in Green Mode: 3mA
Peak-Current-Mode Operation with Cycle-by-Cycle
Current Limiting
PWM Frequency Continuously Decreasing with
Burst Mode at Light Loads
V
Constant Output Power Limit (Full AC Input Range)
Over-Temperature Protection (OTP)
Fixed PWM Frequency (65KHz) with Frequency
Hopping
Feedback Open-Loop Protection with 56ms Delay
Soft Start Time: 5ms
400mA Driving Capability
Power Adapters
Open-Frame SMPS
SMPS with Surge-Current Output, such as for
Printers, Scanners, and Motor Drivers
DD
Over-Voltage Protection (OVP)
Operating Temperature Range
-40 to +105°C
-40 to +105°C
Description
A highly integrated PWM controller, FAN6862R/L
provides several features to enhance the performance
of flyback converters. To minimize standby power
consumption,
provides off-time modulation to continuously decrease
the switching frequency under light-load conditions.
Under zero-load conditions, the power supply enters
burst mode, which completely shuts off PWM output.
Output restarts just before the supply voltage drops
below the UVLO lower limit. This green-mode function
enables power supplies to meet international power
conservation requirements.
The FAN6862R/L is designed for SMPS and integrates
a frequency-hopping function that helps reduce EMI
emission of a power supply with minimum line filters.
The built-in synchronized slope compensation is
proprietary sawtooth compensation for constant output
power limit over universal AC input range. The gate
output is clamped at 18V to protect the external
MOSFET from over-voltage damage.
Other protection functions include V
protection, over-temperature protection, and overload
protection. For over-temperature protection, an external
NTC thermistor can be applied to sense the ambient
temperature. When OVP, OTP, or OLP is activated, an
internal protection circuit switches off the controller.
Part Number
FAN6862RTY Auto Restart Auto Restart Auto Restart
FAN6862LTY
Eco Status
Green
Green
a
6-Pin SSOT-6
6-Pin SSOT-6
Latch
OVP
proprietary
Package
Latch
green-mode
OTP
Packing Method
Tape & Reel
Tape & Reel
DD
January 2010
www.fairchildsemi.com
over-voltage
Latch
OLP
function

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FAN6862L Summary of contents

Page 1

... FAN6862R / FAN6862L Highly Integrated Green-Mode PWM Controller Features Low Startup Current: 8µA Low Operating Current in Green Mode: 3mA Peak-Current-Mode Operation with Cycle-by-Cycle Current Limiting PWM Frequency Continuously Decreasing with Burst Mode at Light Loads V Over-Voltage Protection (OVP) DD Constant Output Power Limit (Full AC Input Range) ...

Page 2

... Typical Application Block Diagram © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 Figure 1. Typical Application Figure 2. Block Diagram 2 www.fairchildsemi.com ...

Page 3

... This pin senses the voltage across a resistor. When the voltage reaches the internal threshold, PWM output is disabled. This activates over-current protection. This pin also provides current amplitude information for current-mode control. 3 ABx: ABA: FAN6862LTY ABC: FAN6862RTY TT: Wafer Lot Code : Year Code ...

Page 4

... The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol T Operating Ambient Temperature A © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 Parameter <50°C A Parameter 4 Min ...

Page 5

... FB Threshold Voltage For Frequency V FB-N Reduction V FB Voltage at f FB-G OSC Threshold Voltage for Zero Duty FB-ZDC f Frequency Variation vs Frequency Variation vs. Temperature f DT Deviation © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 Parameter Test Condition V DD-ON C =1nF L GATE Open =5V DD Duty>51% Duty=0% ...

Page 6

... Threshold Voltage for Over-Temperature V OTP Protection t Over-Temperature Debounce Time DOTP nd 2 Threshold Voltage for Over- V OTP2 Temperature Protection Over-Temperature Debounce Time DOTP2 © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 (Continued) Parameter Test Condition V =15V =8V =1nF L C =1nF L V ...

Page 7

... Turn-On Threshold Voltage (V vs. Temperature 4.5 4.1 3.7 3.3 2.9 2.5 -40 -30 - Temperature (ºC) Figure 7. Operating Current ( -40 -30 - Temperature (ºC) Figure 9. Center Frequency (f © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 9.5 9.1 8.7 8.3 7.9 7 100 125 -40 ) Figure 6. DD-ON 26 25.6 25.2 24.8 24 100 125 -40 ) vs. Temperature Figure 8. ...

Page 8

... Temperature (ºC) Figure 13. Open-Loop Protection Delay Time (t vs. Temperature 0.55 0.51 0.47 0.43 0.39 0.35 -40 -30 - Temperature (ºC) Figure 15. Valley Threshold Voltage for Current Limit (V ) vs. Temperature STHVA © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 (Continued) 4.9 4.8 4.7 4.6 4.5 4.4 4 100 125 - vs. Temperature Figure 12. Threshold Voltage for Open-Loop FB-G 0 ...

Page 9

... Temperature (ºC) Figure 17. Maximum Duty Cycle (DCY vs. Temperature -40 -30 - Temperature (ºC) Figure 19. Falling Time (t © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 (Continued) 180 160 140 120 100 100 125 -40 ) Figure 18. Rising Time (t MAX ...

Page 10

... Once V rises above V FB resumes. Burst mode alternately enables and disables switching, thereby reducing switching loss in standby mode, as shown in Figure 23. © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 startup circuit and +4.2kHz 65kHz -4 ...

Page 11

... Protection (OVP), Open-Loop / Overload Protection (OLP), Over-Current Protection (OCP), Short-Circuit Protection, and Over-Temperature Protection (OTP). FAN6862R uses auto-restart mode protections and FAN6862L uses latch-mode protections. Auto-Restart Mode Protection: Once a fault condition is detected, switching is terminated and the MOSFET remains off. This causes V DD power is delivered from auxiliary winding ...

Page 12

... Figure 27. Figure 27. Sawtooth Current Limiter © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 Leading-Edge Blanking (t Each time the power MOSFET is switched on, a turn-on ...

Page 13

... 85.29% (Energy star V2. 25% 50% Figure 29. Measured Efficiency and Over-Current Protection © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 Input Voltage Range 90~265V 75% 100% Load (%) Figure 30. Schematic of Typical Application Circuit 13 Output 19V/2.1A (40W Over Current Protection 4 ...

Page 14

... Terminal Fly- Fly Primary-Side Inductance Primary-Side Effective Leakage © 2009 Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 (Continued) Figure 31. Transformer Diagram WIRE Ts 0.25*1 9 0.25 COPPER SHIELD 1.2 0. COPPER SHIELD 1.2 0. CORE ROUNDING TAPE Pin Specification 3- ...

Page 15

... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or 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 Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...

Page 16

... Fairchild Semiconductor Corporation FAN6862R/L • Rev. 1.0.0 16 www.fairchildsemi.com ...

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