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參數(shù)資料
| 型號： | FAN6793NY |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 68 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | GREEN, MS-001BB, DIP-16 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 1044K |
| 代理商： | FAN6793NY |
2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6791 / FAN6793 Rev. 1.0.3
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Pin Definitions
Pin #
Name
Description
1
HV
For startup, this pin is pulled HIGH to the line input or bulk capacitor via resistors.
2
NC
No connection.
3
GND
Ground
.
4
RI
Oscillator Setting
. One resistor connected between RI and ground pins determines the switching
frequency (resistance between 12 ~ 47k is recommended). The switching frequency is equal to
[1560 / RI]kHz, where RI is in k
Ω. For example, if RI is equal to 24kΩ, then the switching frequency
is 65kHz.
5
FBFYB
Voltage Feedback for Flyback PWM Stage
. It is internally pulled HIGH through a 6.5k
Ω resistor.
An external opto-coupler from secondary feedback circuit is usually connected to this pin.
6
IFYB
PWM Current Sense for Flyback PWM Stage
. The sensed voltage is used for peak-current-
mode control and cycle-by-cycle current limiting.
7
FBPWM
Voltage Feedback for Forward PWM Stage
. It is internally pulled HIGH through a 6.5k
Ω resistor.
An external opto-coupler from secondary feedback circuit is usually connected to this pin.
8
IPWM
PWM Current Sense for Forward PWM Stage
. Via a current sense resistor, this pin provides the
control input for peak-current-mode control and cycle-by-cycle current limiting.
9
VREF
Reference Voltage
. This pin can provide a reference voltage 5V.
10
SS
PWM Soft-Start
. During startup, the SS pin charges an external capacitor with a 20A constant
current source. The voltage on FBPWM is clamped by SS during startup. In the event of a
protection condition occurring and/or forward PWM being disabled, the SS pin quickly discharges.
11
ON/OFF
PWM Remote ON/OFF
. Active HIGH. The forward PWM is disabled whenever the voltage at this
pin is lower than 0.8V or the pin is open.
12
PGND
Ground
. The power ground.
13
OPWM
Forward PWM Gate Drive
. The totem-pole output drive for the forward PWM MOSFET. This pin is
internally clamped under 16V to protect the MOSFET.
14
VDD
Power Supply
. The internal protection circuit disables PWM output as long as VDD exceeds the
OVP trigger point.
15
OFYB
Flyback PWM Gate Drive
. The totem-pole output drive for the forward PWM MOSFET. This pin is
internally clamped under 16V to protect the MOSFET.
16
VRMS
Line-Voltage Detection
. The pin is used for line compensation, for forward, and brownout
protection.
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參數(shù)描述 |
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| FAN6862_10 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
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