米6体育平台手机版

ZHCSSK2D October 2006 – October 2024 XTR111

PRODUCTION DATA

封装选项

机械数据 (封装 | 引脚)

DGQ|10
- MPDS043F
DRC|10
- MPDS117L

散热焊盘机械数据 (封装 | 引脚)

DGQ|10
- PPTD325B
DRC|10
- QFND013N

订购信息

6.3.6 Voltage Regulator

The externally adjustable voltage regulator provides up to 5mA of current and offers drive (REGF) and sense (REGS) to allow external setting of the output voltage. Figure 6-7 shows the voltage regulator basic connections. The sense input (REGS) is referenced to 3.0V representing the lowest adjustable voltage level. An external resistor divider sets V_REGF.

Equation 3.

V_{R E G F} = V_{R E G S} \times \frac{(R_{1} + R_{2})}{R_{2}}

XTR111 Basic Connections of the
Voltage Regulator

Figure 6-7 Basic Connections of the Voltage Regulator

Table 6-2 provides example values for the regulator adjustment resistors.

Table 6-2 Example Resistor Values for Setting the Regulator Voltage

V_REGF	R₁	R₂
3V	0kΩ	—
3.3V	3.3kΩ	33kΩ
5V	5.6kΩ	8.2kΩ
12.4V	27kΩ	8.6kΩ

The voltage at REGF is limited by the supply voltage. If the supply voltage drops close to the set voltage, the driver output saturates and follows the supply with a voltage drop of less than 1V (depending on load current and temperature).

For good stability and transient response, use a load capacitance of 470nF or greater. The bias current into the sense input (REGS) is typically less than 1μA. Consider the bias current when selecting high resistance values for the voltage setting because the bias current lowers the voltage and produces additional temperature dependence.

The REGF output cannot sink current. In case of supply-voltage loss, the output is protected against the discharge currents from load capacitors by internal protection diodes; the peak current must not exceed 25mA.

If the voltage regulator output is not used, connect REGF to REGS (3V mode) loaded with a 2.2nF capacitor. Alternatively, overdrive the loop pulling REGS high; Figure 6-7d shows this method.