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參數(shù)資料
| 型號(hào)： | US3033 |
| 廠商： | Unisem Group |
| 英文描述： | PWM SWITCHER & LINEAR CONTROLLER IC |
| 中文描述： | 脈寬調(diào)制開關(guān) |
| 文件頁(yè)數(shù)： | 3/9頁(yè) |
| 文件大?。?/td> | 79K |
| 代理商： | US3033 |
US3033
4-3
Rev. 1.5
1/14/99
PIN DESCRIPTIONS
PIN # PIN SYMBOL
3
PIN DESCRIPTION
A resistor divider from this pin to the output of the switching regulator and ground sets the
Core supply voltage.
The feedback pin of the linear regulator. A resistor divider from this pin to the output of the
linear regulator and ground sets the I/O supply voltage.
The drive pin of the linear regulator. This pin controls the base of a transistor or the gate
of a MOSFET acting as the series pass element for the linear regulator.
This pin is connected to the IC substrate and must be connected to the lowest potential
in the system.
The PWM output of the switching controller. This pin is a totem pole drive that is con-
nected to the gate of the power MOSFET. A resistor may be placed from this pin to the
gate in order to reduce switching noise.
A resistor and a 10pF capacitor is connected from this pin to the V
FB1
pin to set the
output ripple voltage for the switching regulator.
This pin supplies the voltage to the PWM drive and hysterises circuitry and it is con-
nected to the 12V supply. A 1 uF, high frequency capacitor must be connected from this
pin to ground to provide the peak current for charging and discharging of the MOSFET.
This pin provides the biasing for the chip and drive for the linear regulator controller. It
isconnected to 12V supply. A 10 ohm resistor in series from this pin to the 12V supply
and a 1uF, high frequency capacitor connected from this pin to Gnd is required to filter
the switching noise of the switching regulator.
BLOCK DIAGRAM
Figure 1 - Simplified block diagram of the US3033
Vref
UVLO
1.25V
PWM Control
V12sw
2
Vhyst
4
Vfb2
6
Drv 1
1
Gnd
5
Vfb 1
3
Drv 2
7
3033blk1-1.0
V12
8
5V Reg
V
FB1
6
V
FB2
7
Drv2
5
Gnd
1 Drv1
4
V
HYST
2
V
12SW
8
V
12
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PDF描述 |
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| US3033CS | PWM SWITCHER & LINEAR CONTROLLER IC |
| US3034 | 8 PIN PWM SWITCHER CONTROLLER IC |
| US3034CS | 8 PIN PWM SWITCHER CONTROLLER IC |
| US3036 | 8 PIN PWM SWITCHER CONTROLLER IC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| US3033CS | 制造商:UNISEM 制造商全稱:UNISEM 功能描述:PWM SWITCHER & LINEAR CONTROLLER IC |
| US3034 | 制造商:UNISEM 制造商全稱:UNISEM 功能描述:8 PIN PWM SWITCHER CONTROLLER IC |
| US3034CS | 制造商:UNISEM 制造商全稱:UNISEM 功能描述:8 PIN PWM SWITCHER CONTROLLER IC |
| US3036 | 制造商:UNISEM 制造商全稱:UNISEM 功能描述:8 PIN PWM SWITCHER CONTROLLER IC |
| US3036CS | 制造商:UNISEM 制造商全稱:UNISEM 功能描述:8 PIN PWM SWITCHER CONTROLLER IC |
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