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参数资料
| 型号： | L6731D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | HTSSOP-16 |
| 文件页数： | 3/23页 |
| 文件大小： | 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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相关代理商/技术参数 |
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| L6731DTR | 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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