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FAN6757 PDF даташит

Спецификация FAN6757 изготовлена ​​​​«Fairchild Semiconductor» и имеет функцию, называемую «PWM Controller».

Детали детали

Номер произв FAN6757
Описание PWM Controller
Производители Fairchild Semiconductor
логотип Fairchild Semiconductor логотип 

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FAN6757 Даташит, Описание, Даташиты
FAN6757mWSaver® PWM Controller
November 2013
Features
Single-Ended Topologies, such as Flyback and
Forward Converters
mWSaver® Technology
- Achieves Low No-Load Power Consumption:
<50 mW at 230 VAC (EMI Filter Loss Included)
- Eliminates X Capacitor Discharge Resistor Loss
with AX-CAP® Technology
- Linearly Decreases Switching Frequency
to 23 kHz
- Burst Mode Operation at Light-Load Condition
- 500 V High-Voltage JFET Startup Circuit to
Eliminate Startup Resistor Loss
Highly Integrated with Rich Features
- Proprietary Frequency Hopping to Reduce EMI
- High-Voltage Sampling to Detect Input Voltage
- Peak-Current-Mode Control with Slope
Compensation
- Cycle-by-Cycle Current Limiting with Line
Compensation
- Leading-Edge Blanking (LEB)
- Built-In 7 ms Soft-Start
Advanced Protections
- Brown-In/Brownout Recovery
- Internal Overload / Open-Loop Protection (OLP)
- VDD Under-Voltage Lockout (UVLO)
- VDD Over-Voltage Protection (VDD OVP)
- Over-Temperature Protection (OTP)
- Current-Sense Short-Circuit Protection (SSCP)
Description
The FAN6757 is a next-generation Green Mode PWM
controller with innovative mWSaver® technology, which
dramatically reduces standby and no-load power
consumption, enabling conformance to worldwide
Standby Mode efficiency guidelines.
An innovative AX-CAP® method minimizes losses in the
EMI filter stage by eliminating X-cap discharge resistors
while meeting IEC61010-1 safety requirements.
Protections ensure safe operation of the power system
in various abnormal conditions. A proprietary frequency-
hopping function decreases EMI emission. Built-in
synchronized slope compensation allows more stable
Peak-Current-Mode control over a wide range of input
voltage and load conditions. The proprietary internal line
compensation ensures constant output power limit over
the entire universal line voltage range.
Requiring a minimum number of external components,
FAN6757 provides a basic platform that is well suited for
cost-effective flyback converter designs that require
extremely low standby power consumption.
Applications
Flyback power supplies that demand extremely low
standby power consumption, such as:
Adapters for Notebooks, Printers, Game Consoles
Open-Frame SMPS for LCD TV, LCD Monitors,
Printers
Ordering Information
Part Number
Protections(1)
OLP OVP OTP SSCP
Operating
Temperature Range
FAN6757MRMX A/R
L
L A/R
-40 to +105°C
Note:
1. A/R = Auto Recovery Mode protection, L = Latch Mode protection.
Package
8-Pin, Small-Outline
Package (SOP)
Packing
Method
Tape &
Reel
© 2013 Fairchild Semiconductor Corporation
FAN6757 • Rev. 1.0.1
www.fairchildsemi.com









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FAN6757 Даташит, Описание, Даташиты
Application Diagram
VAC
FAN6757
1 GND GATE 8
2 FB
VDD 7
3 NC SENSE 6
4 HV
RT 5
+
VO
-
Figure 1. Typical Application
Internal Block Diagram
HV
4
Line
Sensing
VDDOVP
OTP
Brownout Function
Latch
Protection
High/Low Line
Compensation
VLimit
Re-Start
Protection
SSCP
OLP
NC
3
VPWM
Soft
Driver
8 GATE
VDD 7
RT 5
UVLO
Internal
BIAS
VDD-OVP
VDD-ON /
VRESTART
Pattern
Generator
VRESET
tD-VDDOVP
VDD
OVP
IRT
VRTTH1
tD-OTP1
tD-OTP2
OSC
Green
Mode
SQ
R
VRESET SSCP
SSCP
Comparator
tD-SSCP
VSSCP-H/L
Soft-Start
Comparator
Current Limit
Comparator
PWM
Comparator
Soft-Start
VLimit
Blanking
Circuit
6 SENSE
Max.
Duty
VPWM
Slope
Compensation
VFB-OPEN
OTP
OLP
tD-OLP
OLP
Comparator
3R
R
ZFB
2 FB
VRTTH2
1
GND
Figure 2. Functional Block Diagram
VFB-OLP
© 2013 Fairchild Semiconductor Corporation
FAN6757 • Rev. 1.0.1
2
www.fairchildsemi.com









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FAN6757 Даташит, Описание, Даташиты
Marking Information
ZXYTT
6757
TM
Z - Plant Code
X - 1-Digit Year Code
Y - 1-Digit Week Code
TT - 2-Digit Die Run Code
T - Package Type (M=SOP)
M - Manufacture Flow Code
Pin Configuration
Figure 3. Top Mark
SOP-8
GND
1
8 GATE
FB 2
7 VDD
NC 3
6 SENSE
HV 4
5 RT
Figure 4. Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
Description
GND
Ground. This pin is used for the ground potential of all the pins. A 0.1 µF decoupling capacitor
placed between VDD and GND is recommended.
Feedback. The output voltage feedback information from the external compensation circuit is fed
FB
into this pin. The PWM duty cycle is determined from this pin and the current-sense signal from
Pin 6. The FAN6757 performs open-loop protection: if the FB voltage is higher than a threshold
voltage (around 4.6 V) for more than 57.5 ms, the controller latches off the PWM.
NC No connection
High-Voltage Startup. This pin is connected to the line input or bulk capacitor, via 200 kΩ
resistors, to achieve brownout and high/low line compensation. If the voltage of the HV pin is
HV lower than the brownout voltage (AC line peak voltage less than 100 V) and lasts for 65 ms,
PWM output turns off. High/low line compensation dominates the OCP level and cycle-by-cycle
current limit, to solve the unequal OCP level and power-limit problems under universal input.
Over-Temperature Protection. An external NTC thermistor is connected from this pin to the
GND pin. The impedance of the NTC thermistor decreases at high temperatures. Once the
RT
voltage of the RT pin drops below the threshold voltage, the controller latches off the PWM. If the
RT pin is not connected to an NTC resistor for over-temperature protection, it is recommended to
place one 100 resistor to ground to prevent from noise interference. This pin is limited by an
internal clamping circuit.
SENSE
Current Sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle
current limiting.
VDD
Power Supply. The internal protection circuit disables PWM output as long as VDD exceeds the
OVP trigger point.
GATE
Gate Drive Output. The totem-pole output driver for the power MOSFET. It is internally clamped
below 14.5 V.
© 2013 Fairchild Semiconductor Corporation
FAN6757 • Rev. 1.0.1
3
www.fairchildsemi.com










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