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參數(shù)資料
| 型號： | HA16148PS |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | AC/DC Switching Converter Controller IC With High-Voltage Power MOS FET |
| 中文描述： | AC / DC開關變換器控制IC與高壓電源MOS FET |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 113K |
| 代理商： | HA16148PS |
HA16148PS
7
Error Amplifier
The error amplifier comprises a constant-current source type Pch top differential amplifier. As the
inverting input (FB) pin and output (COMP) pin are provided as external pins, use for both a simple
flyback power supply back-up voltage feedback type and a high-precision secondary voltage detection type
is possible.
Current Sense Circuit
This is a 200 ns high-speed comparator circuit suitable for current mode control. The current sense
controller reference voltage depends on the COMP pin voltage, being always 1/3 of the COMP pin voltage.
+
Error amplifier
+
FF
R
2R
Current sense
comparator
Current sense
resistance
1/3 attenuator
Power
MOS FET
Leading edge
blanking
Driver
Osc.
300 ns
Delay circuit
Figure 2 Current Sense Peripheral Circuitry
Leading Edge Blanking Circuit
The on-chip leading edge blanking circuit masks the current sense comparator input signal for a period of
300 ns after the power MOS FET gate voltage goes high. This reduces the erroneous operation due to
spike-shaped noise caused by discharge of various capacitance components when the power MOS FET is
turned on.
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