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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ISL97692 데이터시트(PDF) 22 Page - Renesas Technology Corp |
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ISL97692 데이터시트(HTML) 22 Page - Renesas Technology Corp |
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22 / 32 page  ISL97692, ISL97693, ISL97694A FN7839 Rev.6.00 Page 22 of 32 Sep 8, 2017 The minimum voltage, VOVP(min) = 24.53V, sets the maximum number of LEDs per channel because this is the worst case minimum voltage that the boost converter is guaranteed to supply. The maximum voltage, VOVP(max) = 25.88V, sets the minimum number of LEDs per channel because it sets the lowest voltage that the boost converter is guaranteed to reach: 40% x 25.88V = 10.35V. Using LEDs with a VF tolerance of 3V to 4V, this VOVP example is suitable for strings of 4 to 6 LEDs. If fewer than 4 LEDs per channel are specified, VOVP must be reduced. Switching Frequency The boost switching frequency is adjusted by resistor RFSW (Equation 15): Where: -8.65x1010 is determined by design -fSW is the desirable boost switching frequency (Hz) -RFSW is resistor from FSW pin to GND (Ω) Inductor Choose the inductance according to Table 4: The inductor saturation current rating should be as provided by Equation 16: Where: -IL is the minimum inductor saturation current rating (A) -VOUT is the maximum output voltage set by OVP (V) -ILED is the sum of the channel currents (A) -VIN is the minimum input voltage (V) If the calculation produces a current rating higher than the 3.08A maximum boost switch current limit, then a 3A inductor current rating is adequate. For example, for a system using 4 LED channels with 30mA per channel and a maximum output voltage (OVP) of 24.53V with an input supply of 2.7V minimum as shown by Equation 17: Output Capacitor It is recommended that a two of 4.7µF X5R/X7R or equivalent ceramic output capacitor is used. Schottky Diode The Schottky diode should be rated for at least the same forward current as the inductor, and for a reverse voltage equal to at least the maximum output voltage, OVP. Compensation The ISL97692, ISL97693, ISL97694A are boost regulator uses a current mode control architecture with a standardized external compensation network connected to the COMP pin. The component values shown in the “Typical Application Circuits” on page 3, are ideal for most typical applications. The network comprises a series RC of 12kΩ and 15nF from COMP to GND. Applications Unused LED Channels Connect unused LED channels to GND. Dimming Mode Setting High Current Applications Each channel of the ISL97692 supports 40mA continuous sink current. Each channel of the ISL97693, ISL97694A supports 30mA continuous sink current. For applications that need higher current, multiple channels can be ganged together (Tables 6 and 7). TABLE 4. INDUCTOR SELECTION BOOST FREQUENCY INDUCTANCE (µH) 400kHz to 700kHz 10 to 15 700kHz to 1MHz 6.8 to 10 1MHz to 1.5MHz 4.7 to 8.2 1.5MHz 3.3 to 4.7 fSW 8.65 10 10 RFSW -------------------------------- = (EQ. 15) IL 1.35 VOUT ILED VIN ----------------------------------------------------- = (EQ. 16) IL 1.35 24.53 4 0.03 2.7 ----------------------------------------------------------------- 1.47A == (EQ. 17) TABLE 5. DIMMING MODE SETTING OF ISL97694A DIMMING MODE SCL SDA /PWMI FPWM Direct PWM GND PWM VIN Phase shift PWM GND PWM Connect a resistor FPWM pin to GND I2C Control SCL SDA Connect a resistor FPWM pin to GND TABLE 6. GANGED ISL97692 CHANNELS FOR HIGHER CURRENT TOTAL CHANNELS CHANNEL CURRENT CHANNEL CONNECTIONS 4 40mA per channel CH1, CH2, CH3, CH4 2 80mA per channel {CH1 & CH2}, {CH3 & CH4} 1 160mA {CH1 & CH2 & CH3 & CH4} TABLE 7. GANGED ISL97693, ISL97694A CHANNELS FOR HIGHER CURRENT TOTAL CHANNELS CHANNEL CURRENT CHANNEL CONNECTIONS 6 30mA per channel CH1, CH2, CH3, CH4, CH5, CH6 3 60mA per channel {CH1, CH2}, {CH3, CH4}, {CH5, CH6} 2 90mA per channel {CH1, CH2, CH3}, {CH4, CH5, CH6} 1 180mA {CH1, CH2, CH3, CH4, CH5, CH6} |
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