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參數(shù)資料
| 型號(hào)： | MB3825 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 6-ch DC/DC Converter IC With Synchronous Rectifier |
| 中文描述： | 6通道DC / DC轉(zhuǎn)換同步整流集成電路 |
| 文件頁數(shù)： | 19/39頁 |
| 文件大小： | 465K |
| 代理商： | MB3825 |
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MB3825A
19
I
FUNCTIONAL DESCRIPTION
1.
Switching Regulator Function
(1) Reference voltage circuit
The reference voltage circuit generates a temperature-compensated reference voltage ( : 1.500 V) using the voltage
supplied from the power supply terminal (pin 28). This voltage is used as the reference voltage for the internal
circuits of the IC. The reference voltage of up to 1mA can also be supplied to an external device from the V
REF
terminal (pin 27).
(2) Triangular-wave oscillator circuit
By connecting a timing capacitor and a resistor to the C
T
(pin 22) and the R
T
(pin 21) terminals, it is possible to
generate any desired triangular oscillator waveform (CT : amplitude 1.0V to 1.4V, CT1 : amplitude 0.65V to 1.35V
in phase with CT1, and CT2 : amplitude 0.65V to 1.35V in inverse phase with CT). The triangular wave is input to
CT1, CT2 and the PWM comparator within the IC.
(3) Error amplifier
This amplifier detects the output voltage of the switching regulator and outputs a PWM control signal accordingly.
It has a wide common-mode input voltage range from 0 V to V
CC
–0.9 V on channels 5 and 6 allows easy setting
from an external power supply, making the system suitable for DC motor speed control.
By connecting a feedback resistor and capacitor from the error amplifier output pin to the inverted input pin, you
can form any desired loop gain, for stable phase compensation.
(4) PWM comparator
The PWM comparators in these channels are a voltage comparator with one inverted input and one non-inverted
input (channels 1, 2, 4, 5, 6) as well as one inverted input and two non-inverted inputs (channel 3), and voltage
pulse width modifier to control output duty according to input voltage.
In the interval when the error amplifier output voltage is higher than the triangular waveform, the output transistor
is turned on (channels 1, 2, 4, 5, 6).
In the interval when the error amplifier output voltage is lower than the triangular waveform, the output transistor
is turned on (channel 1,4 synchronous rectifier side).
In the interval when the error amplifier output voltage and DTC3 voltage are higher than the triangular waveform,
the output transistor is switched on (channel 3).
(5) Output circuit
The output circuits is comprised of a totem-pole configuration on both the main side and synchronous rectifier side,
and can drive an external PNP transistor (main side) or N-ch MOSFET (synchronous rectifier side).
Sink current (on the main side) can be set up to 20 mA depending on the resistance of the VB pin.
2.
Channel on and off levels are dependent on the voltage levels of the CTL1 terminal (pin 30) and CTL 2 terminal
(pin 29).
Channel Control Function
Table 1 Channel by Channel On/Off Setting Conditions.
*: The power supply current in standby mode is 10
μ
A or less.
CTL pin voltage
level
On/Off state of channel
CTL1
CTL2
Power
supply
circuit
Channel 1
Channel 2 Channel 4 Channel 5
Channel 6
Channel 3
L
X
OFF (standby mode)*
H
L
ON
OFF
H
ON
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB3825A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectifier |
| MB3825APFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectifier |
| MB3827 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down |
| MB3827PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down |
| MB3828 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Pentium DC/DC Converter IC |
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