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| 型號(hào)： | AS2916B16DT |
| 廠商： | Princeton Technology Corporation |
| 英文描述： | PWM Controller |
| 中文描述： | PWM控制器 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 63K |
| 代理商： | AS2916B16DT |
251
www.ptcc.com.tw
AS2916
PWM Controller
Pin Function Description
Pin Number
Function
Description
1
OUTB
This is the gate drive output for the Main FET. The totem pole
output has equivalent of an extra 10
resistor to limit the FET
turn on speed and a pull down resistor to ensure the FET gate
is never open. No external circuitry except for the FET is
expected on this pin. The largest FET expected to be driven is
IRFBC40. If a larger power FET is used, a buffer might be
required.
Positive supply for the IC. Absolute maximum rating is 20 V.
The running voltage shall be provided by the Auxiliary conver
tor.
Output of 5 V series regulator.
This is the Main convertor current sense pin. An external RC
filter from the Main power FET and slope compensation resis-
tor from the RAMP pin is all the expected external circuitry.
This is the Main output control pin. An opto isolated control
signal from the secondary side error amplifier is buffered and
connected to the invert pin of the main output current mode
comparator. A pull-up current of 1 mA is provided so the only
external circuitry expected is a common emitter opto-isolator.
This pin provides a 6 μA current source to linearly charge an
external capacitor. This spin is compared to the RAMP pin in
the soft start comparator, terminating output pulses when
RAMP goes above the SS voltage. While this pin is held low,
the main output is inhibited.
This pin is a level-shifted and buffered oscillator waveform,
used to provide slope compensation for the Main and Auxiliary
converters. The pin also serves as the non-inverting input of
the soft-start comparator.
Oscillator frequency and maximum duty cycle are set by con-
necting the resistor (RT) to VREGand a capacitor (CT) to
ground.
Provides an FM modulation of the oscillator, approximately
±25% deviation frequency, at a modulation rate set by an exter-
nal cap at WBL. Shorting to GND eliminates modulation.
This pin is used to remotely turn the main convertor ON/OFF
either for normal user application or for protection.
Bulk OK. This is a brownout protection feature. The pin moni-
tors the bulk voltage through a resistor divider. When BOK
exceeds 2.5 V a 50 μA current is sourced from the pin for hys-
teresis. When the pin drops below 2.5 V the hysteresis is
turned off and SS is pulled low,inhibiting the main output.
The Auxiliary output is not tied to BOK and will run as long as
there is sufficient bias voltage.
2
VCC
3
4
REG
SNSB
5
CMPB
6
SS
7
RAMP
8
OSC
9
WBL
10
ON
11
BOK
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS2916B16NN | 制造商:PTC 制造商全稱:Princeton Technology Corp 功能描述:PWM Controller |
| AS2916B16NT | 制造商:PTC 制造商全稱:Princeton Technology Corp 功能描述:PWM Controller |
| AS291R0JLF | 制造商:TT Electronics / IRC 功能描述:AS291R0JLF |
| AS2930/L | 制造商:Calogic LLC 功能描述: |
| AS2930CS-3.0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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