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G5117 Datasheet(PDF) 7 Page - Global Mixed-mode Technology Inc |
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G5117 Datasheet(HTML) 7 Page - Global Mixed-mode Technology Inc |
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7 / 9 page  Ver: 1.1 Sep 20, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 7 G5115/G5117/G5119 Global Mixed-mode Technology Inc. Table 2. Recommended Output Capacitors PART VALUE (µF) VOLTAGE RATING (V) VENDOR TMK107BJ104MA 0.1 25 Tayo Yuden TMK316BJ105KL 1 25 Tayo Yuden TMK325BJ475MN 4.7 25 Tayo Yuden Input Capacitor Selection For good input voltage filtering the capacitor value can be increased. Low ESR ceramic capacitors are rec- ommended. A 4.7µF ceramic input capacitor is suffi- cient for most applications. Table 3. Recommended Input Capacitors PART VALUE (µF) VOLTATE RATING (V) VENDOR LMK212BJ105MG 1 10V Tayo Yuden JMK212BJ475MG 4.7 6.3V Tayo Yuden JMK212BJ106MG 10 6.3V Tayo Yuden Diode Selection To achieve high efficiency a Schottky diode must be used. The current rating of the diode must meet the peak current rating of the converter. Schottky diodes, with their low forward voltage drop and fast switching speed, are best match for the G5115/G5117/G5119. Table 4. Recommended Diodes PART REVERSE VOLTAGE (V) VENDOR MBR0520 20 On Semiconductor Setting The LED Current The Converter regulates the LED current by regulating the voltage across the current sense resistor (RS). The voltage across the sense resistor is regulated to the internal reference voltage of V(FB)=250mV. The LED Current can be calculated: VFB 0.25V ILED = RS = RS The current programming method is used when the brightness of the LEDs is fixed or control by a PWM signal applied to the SHDN pin. When using a PWM signal on the SHDN pin, the LED brightness is only dependent on the PWM duty cycle, independent of the PWM frequency or amplitude, which simplifies the sys- tems. Layout considerations In all switching power supplies the layout is an impor- tant step in the design, especially at high peak currents and switching frequencies. If the layout is not carefully done, the regulator might show noise problems and duty cycle jitter. The input capacitor should be placed as close as possible to the input pin for good input voltage filtering. The inductor and diode must be placed as close as possible to the switch pin to minimize noise coupling into other circuits. Since the feedback pin and network is a high impedance circuit, the feedback net- work should be routed away from the inductor. |
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