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參數(shù)資料
| 型號： | MB3785APFV |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities) |
| 中文描述： | 0.03 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封裝： | PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 7/29頁 |
| 文件大?。?/td> | 293K |
| 代理商： | MB3785APFV |
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7
MB3785A
2.
The MB3785A allows the four channels of power supply circuits to be controlled independently. Set the voltage
levels on the CTL1 (pin 20), CTL2 (pin 21), and CTL3 (pin 22) terminals to turn the circuit of each channel “ON” or
“OFF”, as listed below.
Channel Control Function
Table 1 Channel by Channel On/Off Setting Conditions.
* :The power supply current value during standby is 10
μ
A or less.
3.
(1) Timer/latch-actuated short-circuiting protection circuit
Protective Functions
The SCP comparator checks the output voltage of each comparator which is used to detect the short-circuiting of
output. When any of these comparators have an output voltage greater than or equal to 2.1 V, the timer circuit is
activated and a protection enable capacitor externally fitted to the SCP terminal (pin 23) begins to charge.
If the comparator’s output voltage is not restored to normal voltage level by the time the capacitor voltage has risen
to the base-emitter junction voltage of the transistor, i.e., V
BE
(
0.65 V), the latch circuit is activated to turn off the
output transistor while at the same time setting the duty (OFF) = 100 %.
When actuated, this protection circuit can be reset by turning on the power supply again.
(2) Under voltage lockout protection circuit
A transient state at power-on or a momentary drop of the power supply voltage causes the control IC to malfunction,
resulting in system breakdown or deterioration. By detecting the internal reference voltage with respect to the power
supply voltage, this protection circuit resets the latch circuit to turn off the output transistor and set the duty (OFF)
= 100 %, while at the same time holding the SCP terminal (pin 23) at the “L”. The reset is cleared when the power
supply voltage becomes greater than or equal to the threshold voltage level of this protection circuit.
CTL pin voltage level
On/Off state of channel
CTL1
CTL2
CTL3
Power supply
circuit
First channel
Second channel
3rd and 4th chan-
nels
H
H
H
ON
ON
ON
L
OFF
L
H
OFF
ON
L
OFF
L
X
Standby state*
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB3785APFV-G-BND(E1) | 制造商:Fujitsu 功能描述: |
| MB3788 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:SWITCHING REGULATOR CONTROLLER |
| MB3789 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller (Supporting External Synchronization) |
| MB3789PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller (Supporting External Synchronization) |
| MB3789PFV-G-BND(E1) | 制造商:Fujitsu 功能描述: |
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