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參數(shù)資料
| 型號(hào)： | GM3326-3.3ST25R |
| 廠商： | American Power Management Inc. |
| 英文描述： | PWM,PWM/PFM SWITCHING STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS |
| 中文描述： | 脈寬調(diào)制，脈寬調(diào)制/ PFM切換升壓 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大小： | 111K |
| 代理商： | GM3326-3.3ST25R |
G
M
3
2
6
3
BLOCK DIAGRAM
VOUT
CE
Error Amp.
+
-
Phase Compensation
+
-
V
with
Ref
Soft Start
CE
PWM/ PFM
Controller
PWM/ PFM
Comparator
Ramp Wave
Generator,
OSC
Buffer, Driver
VDD
EXT/
GND
Block Diagram Explanation
<Error Amp.>
The error amplifier is used as an output voltage monitor. It compares the reference voltage with the feedback from the
voltage divided by the internal resistor. Should a voltage higher than the reference voltage be fedback, the output of the
error amp will increase.
<PWM Comparator>
The PWM comparator compares the output of the error amp with the ramp wave. When the voltage at the output of the error
amp is low, the EXT/ pin will be LOW level (Switching ON time).
<Ramp Wave Generator>
The ramp wave generator, as the name suggests, generates the switching frequency's ramp wave.
<PWM / PFM Controller>
With the GM3326 series, control is automatically switched between PWM and PFM according to the size of the load.
<Vref with Soft Start, CE>
The start up of the Vref voltage at the error amp's input is gradual due to the internal capacitor and low current circuit.
Because of this soft-start function, the operations of the error amp's 2 inputs are balanced and the EXT/ pin's ON time can
be manipulated to produce longer ON times.
Further, with the UVLO function, the signal will be such so as not to turn the MOS switch ON until any instability in the
internal circuit stabilizes during soft-start time. Even in cases where input voltage is so low as to produce instability in the IC,
the UVLO function will operate and the MOS switch will be turned OFF.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GM3326-4.0ST25R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:PWM,PWM/PFM SWITCHING STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS |
| GM3326-4.5ST25R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:PWM,PWM/PFM SWITCHING STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS |
| GM3326-5.0ST25R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:PWM,PWM/PFM SWITCHING STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS |
| GM3326-5.5ST25R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:PWM,PWM/PFM SWITCHING STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS |
| GM3326-6.0ST25R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:PWM,PWM/PFM SWITCHING STEP-UP & DOWN DC/DC CONVERTER CONTROLLER ICS |
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