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参数资料
| 型号： | L6725TR |
| 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： | SOP-16 |
| 文件页数： | 3/32页 |
| 文件大小： | 812K |
| 代理商： | L6725TR |
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L6725 - L6725A
Device description
11/32
5.3
Bypassing the LDO to avoid the voltage drop with low Vcc
If VCC≈5V the internal LDO works in dropout with an output resistance of about 1. The
maximum LDO output current is about 100mA and so the output voltage drop is 100mV, 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 EAREF pin. The maximum value of the external reference depends on the
VCC: with VCC = 4V the clamp operates at about 2V (typ.), while with VCC greater than 5V the
maximum external reference is 2.5V (typ.).
●
VEAREF from 0% to 80% of VCCDR -> External reference/Fsw = 250KHz
●
VEAREF from 80% to 95% of VCCDR -> VREF = 0.6V/Fsw = 500KHz
●
VEAREF from 95% to 100% of VCCDR -> VREF = 0.6V/Fsw = 250KHz
Providing an external reference from 0V to 450mV the output voltage will be regulated but
some restrictions must be considered:
●
The minimum OVP threshold is set at 300mV;
●
The under-voltage-protection doesn't work;
To set the resistor divider it must be considered that a 100K pull-down resistor is integrated into
the device (see Figure 4.). Finally it must be taken into account that the voltage at the EAREF
pin is captured by the device at the start-up when VCC is about 4V.
Figure 3.
Bypassing the LDO
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相关代理商/技术参数 |
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| L6726 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_08 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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| L6726A | 功能描述:开关变换器、稳压器与控制器 Sngl phase PWM controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6726A_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Single phase PWM controller |
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