- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384040 > UPC1935GR (NEC Corp.) DC-DC CONVERTER CONTROL IC PDF資料下載
參數(shù)資料
| 型號： | UPC1935GR |
| 廠商： | NEC Corp. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | DC-DC CONVERTER CONTROL IC |
| 中文描述： | 的DC - DC轉(zhuǎn)換器控制IC |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 185K |
| 代理商： | UPC1935GR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁當(dāng)前第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
Data Sheet G13418EJ3V0DS00
12
μ
PC1935
2.1
Reference Voltage Generator
The reference voltage generator is comprised of a band-gap reference circuit, and outputs a temperature-compensated
reference voltage (2.1 V). The reference voltage can be used as the power supply for internal circuits, or as a reference
voltage, and can also be accessed externally via the V
REF
pin (pin 2).
2.2
Oscillator
The oscillator self-oscillates if a timing resistor is attached to the R
T
pin (pin 3). This oscillator waveform is input to the
inverted input pins (channel 1 and 2) or non-inverted input pin (channel 3) of the three PWM comparators to determine the
oscillation frequency.
2.3
Under Voltage Lock-out Circuit
The under voltage lock-out circuit prevents malfunctioning of the internal circuits when the supply voltage is low, such as
when the supply voltage is first applied, or when the power supply is interrupted. When the voltage is low, the three output
transistors are cut off at the same time.
2.4
Error Amplifiers
The non-inverted input pins of the error amplifiers E/A
1
, E/A
2
, and E/A
3
are connected internally to 0.3 V (the input
threshold voltages are all 0.3 V (TYP)). The circuits of the error amplifiers E/A
1
, E/A
2
, and E/A
3
are exactly the same. The
first stage of the error amplifier is a P-channel MOS transistor input.
2.5
PWM Comparators
The output ON duty is controlled according to the outputs of the error amplifiers and the voltage input to the Dead Time
Control pin (fixed internally for channel 1).
A triangular waveform is input to the inverted pin, and the error amplifier output and Dead Time Control pin voltage (fixed
internally for channel 1) are input to the non-inverted pins of the PWM comparators for channel 1 and channel 2.
Therefore, the output transistor ON period is the period when the triangular waveform is lower than the error amplifier
output and Dead Time Control pin voltage (fixed internally for channel 1).
Channel 3 is the logical inverse of channel 1 and channel 2. Consequently, the triangular waveform is input to the non-
inverted input pin, and the error amplifier output and Dead Time Control pin voltage are input to the inverted input pins of
the PWM comparator for channel 3. Therefore, the transistor ON period is the period when the triangular waveform is
higher than the error amplifier output and Dead Time Control pin voltage (refer to
Timing Charts
).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPC1943 | ADJUSTABLE PRECISION SHUNT REGULATORS |
| UPC1943T | ADJUSTABLE PRECISION SHUNT REGULATORS |
| UPC1944GR | ADJUSTABLE PRECISION SHUNT REGULATORS |
| UPC1944J | ADJUSTABLE PRECISION SHUNT REGULATORS |
| UPC1944T | ADJUSTABLE PRECISION SHUNT REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPC1943 | 制造商:NEC 制造商全稱:NEC 功能描述:ADJUSTABLE PRECISION SHUNT REGULATORS |
| UPC1943T | 制造商:NEC 制造商全稱:NEC 功能描述:ADJUSTABLE PRECISION SHUNT REGULATORS |
| UPC1943T-E1-AZ | 制造商:Renesas Electronics Corporation 功能描述: |
| UPC1944 | 制造商:NEC 制造商全稱:NEC 功能描述:ADJUSTABLE PRECISION SHUNT REGULATORS |
| UPC1944GR | 制造商:NEC 制造商全稱:NEC 功能描述:ADJUSTABLE PRECISION SHUNT REGULATORS |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。