參數(shù)資料
型號(hào)： MB3778
廠商： Fujitsu Limited
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 5/29頁(yè)
文件大小： 276K
代理商： MB3778
MB3778
5
I
OPERATION DESCRIPTION
1.
Reference voltage circuit
The reference voltage circuit generates a temperature-compensated reference voltage ( : 2.46 V) from V
CC
(pin
9) . The reference voltage is used as an operation power supply for internal circuit.
The reference is obtained from the V
REF
terminal (pin 16).
Triangular wave oscillator
2.
Triangular waveforms can be generated at any frequency by connecting a timing capacitor and resistor to the
C
T
terminal (pin 1) and to the R
T
terminal (pin 2) .
The amplitude of this waveform is from 1.3 V to 1.9 V. These waveforms are connected to the non-inverting
inputs of the PWM comparator and can be output through the C
T
terminal.
Error amplifiers (Error Amp.)
3.
The error amplifier detects the output voltage of the switching regulator and outputs PWM control signals.The
in-phase input voltage range is from 1.05 V to 1.45 V.The reference voltage obtained by dividing the reference
voltage output (recommended value : V
REF
/2) or the R
T
terminal voltage (1.23 V) is supplied to the non-inverting
input. The V
REF
/2 voltage is internally connected to non-inverting input of the other error amplifier.
Any loop gain can be chosen by connecting the feedback resistor and capacitor to the inverting input terminal
from the output terminal of the error amplifier.Stable phase compensation is possible.
Timer latch short circuit protection circuit
4.
This circuit detects the output levels of each error amplifier. If the output level of one or both of the error amplifiers
is 2.1 V or higher, the timer circuit begins charging the externally connected protection enable-capacitor.
If the output level of the error amplifier does not drop below the normal voltage range before the capacitor voltage
reaches the transistor base-emitter voltage, V
BE
( : 0.65 V), the latch circuit turns the output drive transistor off
and sets the idle period to 100
%
.
Under voltage lock-out circuit
5.
The transition state at power-on or a momentary drops in supply voltage may cause the control IC to malfunction,
which may adversely affect or even destroy the system. The under voltage lockout circuit monitors V
CC
with
reference to the internal reference voltage and resets the latch circuit to turn the output drive transistor off. The
idle period is set to 100
%
. It also pulls the SCP terminal (pin 15) “Low”.
PWM comparator unit
6.
Each PWM comparator has one inverting input and two non-inverting inputs. This voltage-to-pulse-width con-
verter controls the turning on time of the output pulse according to the input voltage.
The PWM comparator turns the output drive transistor on while triangular waveforms from the oscillator are
lower than the error amplifier output and the DTC terminal voltage.
Output drive transistor
7.
The output drive transistors have open collector outputs with common source supply and common grounds
independent of V
CC
and signal ground. The output drive transistors for switching can sink or source up to 50 mA.
Power control unit
8.
The power control terminal (pin 14) controls power on/off modes(the power supply current in stand-by mode is
10
μ
A or lower).
相關(guān)PDF資料
PDF描述
MB3778P RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
MB3778PF RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
MB3778PFV RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
MB3782 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
MB3782P RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB3778_06 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller
MB3778P 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller
MB3778PF 制造商:Panasonic Industrial Company 功能描述:IC
MB3778PF-E1 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller
MB3778PFV 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*