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NCP5007SNT1G Datasheet(PDF) 5 Page - ON Semiconductor |
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NCP5007SNT1G Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 22 page NCP5007 http://onsemi.com 5 ANALOG SECTION (Typical values are referenced to Ta = +25°C, Min & Max values are referenced −25°C to +85°C ambient temperature, unless otherwise noted.) Rating Pin Symbol Min Typ Max Unit High Level Input Voltage Low Level Input Voltage 1 EN 1.3 − − − − 0.4 V EN Pull Down Resistor 1 REN − 100 − k W Feedback Voltage Threshold 4 FB 170 200 230 mV Output Current Stabilizes @ 5% time delay following a DC−DC startup @ Vbat = 3.6 V, L = 22 mH, Iout = 20 mA 5 Ioutdly − 100 − ms Internal Switch ON Resistor @ Tamb = +25°C 5 QRDSON − 1.7 − W 5. The overall tolerance depends upon the accuracy of the external resistor. THEORY OF OPERATION The DC−DC converter is designed to supply a constant current to the external load, the circuit being powered from a standard battery supply. Since the regulation is made by means of a current loop, the output voltage will vary depending upon the dynamic impedance presented by the load. Considering a high intensity LED, the output voltage can range from a low of 6.4 V (two LED in series biased with a low current), up to 22 V, the maximum the chip can sustain continuously. The basic DC−DC structure is depicted in Figure 3. With a 22 V operating voltage capability, the power device Q1 can accommodate a high voltage source without any leakage current degradation. POR LOGIC CONTROL TIME_OUT ZERO_CROSSING RESET GND Vdsense Q1 Vds L1 22 mH Vbat D1 GND Vs R2 xR GND R1 C2 + − GND Vref V(Ipeak) + − Vdsense Figure 3. Basic DC−DC Converter Structure 4 1 |
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