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參數(shù)資料
| 型號(hào)： | Si9145BQ-T1 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Low-Voltage Switchmode Controller |
| 中文描述： | 低電壓開(kāi)關(guān)模式控制器 |
| 文件頁(yè)數(shù)： | 9/10頁(yè) |
| 文件大?。?/td> | 74K |
| 代理商： | SI9145BQ-T1 |
Si9145
Vishay Siliconix
Document Number: 70021
S-40710—Rev. K, 19-Apr-04
www.vishay.com
9
Pin 9: R
OSC
This pin is the equivalent of a 1.0-V voltage source derived
from the on-chip V
REF
. When a low T.C. resistor is externally
connected from this pin to GND, a temperature independent
current is generated internally. This current is used as the
charging current source connected to the C
OSC
pin. The
current is internally multiplied by 2 and is used as the
discharging current source connected to the C
OSC
pin.
Therefore, the external resistor is one of the factors that
determine the oscillator frequency.
Pin 10: C
OSC
An external capacitor is connected to this pin to set the
oscillator frequency. Internal current sources alternately
charge and discharge the external capacitor. The oscillator
waveform is a symmetrical triangular type with a typical voltage
swing between 1.0 V and 1.5 V.
f
OSC
0.7
R
OSC
C
OSC
Pin 11: OTS
This pin indicates an over-temperature condition on the device
when the output is low. The output is latched low and is reset
with the ENABLE pin going low then high, or by turning power
off and on.
Pin 12: ENABLE
A logic high on this pin allows normal operation. A logic low
places the chip in the standby mode. In standby mode normal
operation is disabled, supply current is reduced, the oscillator
stops and the output is held high for MODE SELECT = low, and
low for MODE SELECT = high.
Pin 13: UVLO
SET
This pin will place the chip in the standby mode if the UVLO
SET
voltage drops below 1.2 V. Once the UVLO
SET
voltage
exceeds 1.2 V, the chip operates normally. There is a built-in
hysteresis of 200 mV.
Pin 14: P
GND
The negative return for the V
S
supply.
Pin 15: OUTPUT
This CMOS push-pull output pin drives the external MOSFET
and is capable of sinking 150 mA or sourcing 130 mA with V
S
equal to 2.7 V.
Pin 16: V
S
The positive terminal of the power supply which powers the
CMOS output driver. A bypass capacitor is required.
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| SI9145BQ-T1-E3 | 功能描述:DC/DC 開(kāi)關(guān)控制器 Lo V-Hi Freq Swmode Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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| SI9145BY-E3 | 功能描述:DC/DC 開(kāi)關(guān)控制器 Lo V-Hi Freq Swmode Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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