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Fairchild Semiconductor Electronic Components Datasheet

FAN6753 Datasheet

Highly Integrated Green-Mode PWM Controller

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July 2009
FAN6753
Highly Integrated Green-Mode PWM Controller
Features
ƒ High-Voltage Startup
ƒ Low Operating Current: 2.7mA
ƒ Adaptive Decreasing PWM Frequency to 22KHz
ƒ Built-in Full-Range Frequency Hopping to Reduce
EMI Emission
ƒ Fixed PWM Frequency: 65KHz
ƒ Peak-Current-Mode Control
ƒ Cycle-by-Cycle Current Limiting
ƒ Leading-Edge Blanking (LEB)
ƒ Synchronized Slope Compensation
ƒ Internal Auto-Recovery Open-Loop Protection
ƒ GATE Output Maximum Voltage Clamp: 18V
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ VDD Over-Voltage Protection (OVP),
Auto Recovery / Latch for Option
ƒ Internal Auto-Recovery Sense Short-Circuit
Protection for Option
ƒ Constant Power Limit (Full AC Input Range)
www.DataShƒeet4IUn.tceormnal OTP Sensor with Hysteresis
ƒ Built-in 5ms Soft-Start Function
ƒ Built-in LATCH Pin Pull HIGH (> 5.2V)
Latch Function
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
ƒ Power Adapters
ƒ Open-Frame SMPS
Description
The highly integrated FAN6753 PWM controller
provides several features to enhance the performance
of flyback converters.
To minimize standby power consumption, a proprietary
adaptive green-mode function provides frequency
modulation at light-load conditions. To avoid acoustic-
noise problems, the minimum PWM frequency is set
above 22KHz. This green-mode function enables the
power supply to meet international power conservation
requirements. With the internal high-voltage startup
circuitry, the power loss due to bleeding resistors is also
eliminated. To further reduce power consumption,
FAN6753 is manufactured using the BiCMOS process,
which allows an operating current of only 2.7mA.
FAN6753 integrates a full-range frequency-hopping
function internally that helps reduce EMI emission of a
power supply with minimum line filters. Its built-in
synchronized slope compensation achieves stable
peak-current-mode control. The proprietary internal line
compensation ensures constant output power limit over
a wide AC input voltage range, from 90VAC to 264VAC.
FAN6753 provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures safety should an
open-loop or output short-circuit failure occur. PWM
output is disabled until VDD drops below the UVLO lower
limit, when the controller starts up again. As long as VDD
exceeds ~26V, the internal OVP circuit is triggered.
FAN6753 is available in an 8-pin SOP package.
Ordering Information
Part Number
FAN6753MY
Operating
Temperature Range
-40°C to +105°C
Eco Status
Package
Packing Method
Green
8-Lead, Small Outline Package Tape & Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN6753 • Rev. 1.0.1
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN6753 Datasheet

Highly Integrated Green-Mode PWM Controller

No Preview Available !

Marking Information
ZXYTT
6753
TPM
F: Fairchild Logo
Z: Plant Code
X: 1-Digit Year Code
Y: 1-Digit Week Code
TT: 2-Digit Die Run Code
T: Package Type (M:SOP)
P: Y=Green Package
M: Manufacture Flow Code
Figure 1. Top Mark
Pin Configuration
LATCH
FB
SENSE
GND
SOP-8
18
27
36
45
HV
NC
VDD
GATE
Figure 2. Pin Configuration (Top View)
Pin Definitions
www.DataShPeeint4U#.comName
1 LATCH
2 FB
3 SENSE
4 GND
5 GATE
6 VDD
7 NC
8 HV
Description
For external latch circuit used. When VLATCHth > 5.2V and after 100µs, IC is latched off.
10Kto GND is recommended. Internal has a sourcing current of 100µA (ILATCH), 100µA
×10K. The voltage on this pin is 1V (under VLATCHth=5.2V).
The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is
determined in response to the signal on this pin and the current-sense signal on the SENSE pin.
Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle
current limiting.
Ground.
The totem-pole output driver. Soft-driving waveform is implemented for improved EMI.
Power supply. The internal protection circuit disables PWM output as long as VDD exceeds the
OVP trigger point.
No connection.
For startup, this pin is pulled HIGH to the line input or bulk capacitor via resistors.
© 2009 Fairchild Semiconductor Corporation
FAN6753 • Rev. 1.0.1
2
www.fairchildsemi.com


Part Number FAN6753
Description Highly Integrated Green-Mode PWM Controller
Maker Fairchild Semiconductor
Total Page 12 Pages
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