FAN6754B Fairchild Semiconductor, FAN6754B Datasheet

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FAN6754B

Manufacturer Part Number
FAN6754B
Description
The highly integrated FAN6754A PWM controller provides several features to enhance the performance of flyback converters
Manufacturer
Fairchild Semiconductor
Datasheet
© 2011 Fairchild Semiconductor Corporation
FAN6754B • Rev. 1.0.0
FAN6754B
Highly Integrated Green- Mode PWM Controller
Brownout and V
Features
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
Ordering Information
FAN6754BMRMY
FAN6754BMLMY
High-Voltage Startup
AC Input Brownout Protection with Hysteresis
Monitor HV to Adjust V
Low Operating Current: 1.5mA
Linearly Decreasing PWM Frequency to 22KHz
Frequency Hopping to Reduce EMI Emission
Fixed PWM Frequency: 65KHz
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking (LEB)
Internal Open-Loop Protection
GATE Output Maximum Voltage Clamp: 13V
V
V
Programmable Over-Temperature Protection (OTP)
Internal Latch Circuit (OVP, OTP)
Open-Loop Protection (OLP); Restart for MR, Latch
for ML
Built-in 8ms Soft-Start Function
Power Adapters
Part Number
DD
DD
Under-Voltage Lockout (UVLO)
Over-Voltage Protection (OVP)
Limit
Limit
Adjustment by HV Pin
Temperature
-40 to +105°C
Operating
Range
8-Pin, Small Outline Package (SOP)
Description
The highly integrated FAN6754B PWM controller
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
FAN6754B saves PWM pulses by entering deep burst
mode. This burst mode function enables the power
supply to meet international power conservation
requirements.
FAN6754B integrates a frequency-hopping function
internally to reduce EMI emission of a power supply with
minimum
compensation is accomplished by proprietary HV
monitor to adjust V
over universal AC input range. The gate output is
clamped at 13V to protect the external MOSFET from
over-voltage damage.
Other protection functions include AC input brownout
protection
protection. For over-temperature protection, an external
NTC thermistor can be applied to sense the external
switcher’s temperature. When V
activated, an internal latch circuit is used to latch-off the
controller. The latch mode is reset when the V
is removed.
FAN6754B is available in an 8-pin SOP package.
Package
zero-load
line
with
a
filters.
hysteresis,
proprietary
Limit
and
for constant output power limit
Built-in
very
and
Packing Method
green-mode
light-load
DD
synchronized
Tape & Reel
OVP or OTP are
V
DD
April 2011
over-voltage
www.fairchildsemi.com
conditions,
DD
function
supply
slope

FAN6754B Summary of contents

Page 1

... To minimize standby power consumption, provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Under FAN6754B saves PWM pulses by entering deep burst mode. This burst mode function enables the power supply to meet international power conservation requirements. FAN6754B integrates a frequency-hopping function ...

Page 2

... HV 4 Line Voltage Sample Circuit HV Startup VDD 7 UVLO 17V/10V V DD-OVP 1.05V 0.7V © 2011 Fairchild Semiconductor Corporation FAN6754B • Rev.1.0.0 Figure 1. Typical Application OVP Latch OTP Protection OLP for ML Brownout Protection V Adjustment Limit OSC S Q Internal BIAS R Soft-Start Comparator Green ...

Page 3

... Feedback. The output voltage feedback information from the external compensation circuit is fed into this pin. The PWM duty cycle is determined by this pin and the current-sense signal from Pin FAN6754B performs open-loop protection (OLP); if the FB voltage is higher than a threshold voltage (around 4.6V) for more than 56ms, the controller latches off the PWM Connection High-Voltage Startup. This pin is connected to the line input via a 1N4007 and 200k ...

Page 4

... Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter T Operating Ambient Temperature Startup Resistor HV © 2011 Fairchild Semiconductor Corporation FAN6754B • Rev.1.0.0 Parameter (1,2) <50°C) A Human Body Model; JESD22-A114 Charged Device Model; JESD22-C101 Min. -40 ...

Page 5

... Brownout Threshold AC-OFF V Brownin Threshold AC-ON  AC-ON AC-OFF t Line Voltage Sample Cycle S-CYCLE t Line Voltage Hold Period H-TIME t PWM Turn-off Debounce Time D-AC-OFF © 2011 Fairchild Semiconductor Corporation FAN6754B • Rev.1.0.0 Condition Min 5.5 3.5 V DD-OFF +2.8 V – 0.16V DD-ON V =20V, FB=3V Gate DD Open V =20V, FB= ...

Page 6

... Typical Performance Characteristics © 2011 Fairchild Semiconductor Corporation FAN6754B • Rev.1.0.0 Figure 5. Brownout Circuit Figure 6. Brownout Behavior Figure 7. V and AC Recovery DD-AC 6 www.fairchildsemi.com ...

Page 7

... Green-Mode Ending FB Voltage FB Threshold Voltage for Zero-Duty Recovery FB-ZDCR V FB Threshold Voltage for Zero-Duty FB-ZDC PWM Frequency f OSC f OSC-G V FB-ZDC © 2011 Fairchild Semiconductor Corporation FAN6754B • Rev.1.0.0 (Continued) Condition Center Frequency Hopping Range FB > FB Deviation V =11V to 22V ...

Page 8

... Output Current from RT Pin RT V RTTH1 Over-Temperature Protection Threshold Voltage V RTTH2 t D-OTP1 Over-Temperature Latch-Off Debounce t D-OTP2 Note: 4. Guaranteed by design. © 2011 Fairchild Semiconductor Corporation FAN6754B • Rev.1.0.0 (Continued) Conditions V =122V, Series R=200k DC =86V =366V, Series R=200kΩ DC =259V Startup Time V ...

Page 9

... Figure 9. Startup Current (I Figure 11. Start Threshold Voltage (V vs. Temperature Figure 13. Supply Current Drawn from HV Pin (I vs. Temperature Figure 15. Frequency in Normal Mode (f vs. Temperature © 2011 Fairchild Semiconductor Corporation FAN6754B • Rev.1.0.0 (Continued) Figure 10. ) vs. Temperature DD-ST ) Figure 12. Minimum Operating Voltage (V DD-ON ) Figure 14. ...

Page 10

... Over-Voltage Protection (V DD vs. Temperature Figure 21. Over-Temperature Protection Threshold Voltage (V ) vs. Temperature RTTH1 Figure 23. Brownin (V AC-ON © 2011 Fairchild Semiconductor Corporation FAN6754B • Rev.1.0.0 (Continued) ) Figure 18. Delay Time of FB Pin Open-Loop FB-OLP Protection (t ) Figure 20. Output Current from RT Pin (I DD-OVP Figure 22. Over-Temperature Protection Threshold ) vs ...

Page 11

... When internal update time is met, this peak value is used for brownout and current-limit level judgment. Equation 1 and 2 calculate the level of brownin or brownout converted to RMS value. For power saving, FAN6754B enlarges the sampling cycle to lower the power loss from HV sampling at light-load condition ...

Page 12

... The HV pin can perform current limit to shrink the tolerance of Over-Current Protection (OCP) under full range of AC voltage, to linearly current limit curve, as shown in 0. FAN6754B also shrinks the V 2 half to lower the I R loss to increase the heavy- SENSE load efficiency. 0.47 0.46 0.45 0.44 0.43 0.42 0.41 0.4 0.39 0.38 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 DC Voltage on HV Pin (V) Figure 25 ...

Page 13

... 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 14

... Fairchild Semiconductor Corporation FAN6754B • Rev. 0.0.1 14 www.fairchildsemi.com ...

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