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參數(shù)資料
| 型號： | L6731D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | HTSSOP-16 |
| 文件頁數(shù)： | 3/23頁 |
| 文件大?。?/td> | 386K |
| 代理商： | L6731D |
L6731D
Device description
11/23
5.3
Bypassing the LDO to avoid the voltage drop with low Vcc
If VCC ≈ 5 V the internal LDO works in dropout with an output resistance of about 1 . The
maximum LDO output current is about 100 mA and so the output voltage drop is 100 mV, to
avoid this the LDO can be bypassed.
5.4
Internal and external references
It is possible to set the internal/external reference and the switching frequency by setting the
proper voltage at the DDR-IN pin. The maximum value of the external reference is 2.5 V
(typ.):
●
VEAREF from 0 % to 80 % of VCCDR -> External reference/FSW = 250 kHz
●
VEAREF from 80 % to 95 % of VCCDR -> VREF = 0.6 V/FSW = 500 kHz
●
VEAREF from 95 % to 100 % of VCCDR -> VREF = 0.6 V/FSW = 250 kHz
Providing an external reference from 0V to 450mV the output voltage will be regulated but
some restrictions must be considered:
●
OV threshold saturates to a minimum value of 300 mV (OV is tracking the
reference; tracking small references will result in a narrow threshold reducing
noise immunity)
●
The under-voltage-protection doesn't work;
●
The PGOOD signal remains low;
To set the resistor divider it must be considered that a 100 k pull-down resistor is integrated
into the device (see Figure 5.). Finally it must be taken into account that the voltage at the
DDR-IN pin is captured by the device at the start-up when V
CC is about 4 V.
Figure 4.
Bypassing the LDO
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| L6731DTR | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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 |
| L6732 | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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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| L6732C | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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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