米6体育平台手机版

ZHCSRQ4 august 2023 TPSM8S6C24

PRODUCTION DATA

封装选项

机械数据 (封装 | 引脚)

MOY|45
- MPQF759

散热焊盘机械数据 (封装 | 引脚)

订购信息

zhcsrq4_oa

9.2.2.8 Enable and UVLO

The ON_OFF_CONFIG command is used to select the turn-on behavior of the converter. For this example, the EN pin or CONTROL pin was used to enable or disable the converter, regardless of the state of OPERATION, as long as the input voltage is present and above the UVLO threshold. The EN pin is pulled low internally if it is floating.

A resistor divider can be added the EN pin to program an additional UVLO. Additionally 0.1 µF can be placed on this pin to filter noise or short glitches. Use Equation 22 and Equation 23 to calculate the resistor values to target a 3.92-V turn-on and a 3.51-V turn-off. Standard resistor values of 30.1 kΩ and 11 kΩ are selected for this example. Use Equation 24 and Equation 25 to calculate the thresholds based on selected resistor values.

Equation 22.

R_{E N T O P} = \frac{V_{O N} \times V_{E N F A L L} - V_{O F F} \times V_{E N R I S E}}{N \times I_{E N H Y S} \times V_{E N R I S E}} = \frac{3.92 V \times 0.98 V - 3.51 V \times 1.05 V}{1 \times 5.5 μ A \times 1.05 V} = 27 k Ω

Equation 23.

R_{E N B O T} = \frac{V_{E N T O P} \times V_{E N F A L L}}{V_{O F F} - V_{E N F A L L} + N \times I_{E N H Y S} \times R_{E N T O P}} = \frac{30.1 k Ω \times 0.98 V}{3.92 V - 0.98 V + 1 \times 5.5 μ A \times 30.1 k Ω} = 9.5 k Ω

Equation 24.

V_{O N} = \frac{V_{E N R I S E} \times (R_{E N B O T} + R_{E N T O P})}{R_{E N B O T}} = \frac{1.05 V \times (11 k Ω + 30.1 k Ω)}{11 k Ω} = 3.92 V

Equation 25.

V_{O F F} = \frac{V_{E N F A L L} \times (R_{E N B O T} + R_{E N T O P})}{R_{E N B O T}} - N \times I_{E N H Y S} \times R_{E N T O P} = \frac{0.98 V \times (11 k Ω + 30.1 k Ω)}{11 k Ω} - 1 \times 5.5 μ A \times 30.1 k Ω = 3.5 V