データシートサーチシステム |
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LM3557SDX-2 データシート(PDF) 7 Page - National Semiconductor (TI) |
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LM3557SDX-2 データシート(HTML) 7 Page - National Semiconductor (TI) |
7 / 11 page Application Information (Continued) WHITE LED CURRENT SETTING For backlighting applications, the white LED current is pro- grammed by the careful choice of the R2 resistor. Backlight: V En ≥ 0.9V 20131617 I LED: White LED Current. V Fb-Sw2: Feedback Voltage. R2: Resistor. The feedback voltage is with respect to the voltage at the Sw2 pin, not ground. For example, if the voltage on the Sw2 pin were 0.1V then the voltage at the Fb pin would be 0.61V (typical). ADJUSTING OVER-VOLTAGE PROTECTION If the over-voltage protection (OVP) threshold is too low for a particular application, a resistor divider circuit can be used to adjust the OVP threshold of a given application. Instead of having the Ovp pin connected to the output voltage, it can be adjusted through a resistor divider circuit to only experience a fraction of the output voltage magnitude. The resistor divider circuit bias current should be at least 100 times greater than the Ovp pin bias current. Using Figure 3, the following equation can be used to adjust the output voltage: 20131618 V OVP: OVP Voltage Threshold. V OUT: Maximum Output Voltage (<35V). R3: Resistor. R4: Resistor. 20131616 FIGURE 3. Programmable Output Voltage www.national.com 7 |
同様の部品番号 - LM3557SDX-2 |
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同様の説明 - LM3557SDX-2 |
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