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NCP5623C Datasheet(PDF) 10 Page - ON Semiconductor |
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NCP5623C Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 11 page NCP5623C http://onsemi.com 10 Figure 4. Output Current Programmed Value ( ILED = F(Step) ) Step 35 25 20 15 10 5 0 0 15 30 30 10 25 5 20 PWM OPERATION The built−in PWM are fully independent and can be programmed to any value during the normal operation of the NCP5623C chip. The PWM operate with five bits, yielding a 32 steps range to cover the full modulation (0 to 100%) of the associated LED: − PWM = $00 ³ the associated LED is fully OFF, whatever be the programmed ILED value − PWM > $00 but < $1F ³ the brightness of the associated LED is set depending upon the PWM modulation value − PWM = $1F ³ the associated LED is fully ON, the current being the one defined by the ILED value. Each PWM is programmable, via the I2C port as depicted, at any time under any sequence arrangement as requested by the end system’s designer. The PWM does not change the ILED value, but merely modulate the ON/OFF ratio of the associated LED. Each step of the PWM represent 100/32 = 3.125% of the full range, the clock being 2.1 kHz (typical). Figure 5. NCP5623C Typical Efficiency as a Function of the Vf VBAT (V) 4.5 4.0 3.5 3.0 2.5 40 70 100 50 60 90 80 Vf = 3.8 V Vf = 2.85 V NOTE: Efficiency is measured with the three PWM equal to 100% Figure 6. Basic RGB Application C3 220 nF D3 D2 D1 C2 GND C1 GND SDA R1 62 k GND SCL GND +Vbat +Vcc GND MCU I2C Port C1P 1 Vbat 11 AGND 6 SDA 7 SCL 9 IREF 8 GND 2 LED1 5 LED2 4 LED3 3 Vout 10 C1N 12 U1 NCP5623C 1 mF/10 V 1 mF/6.3 V GND |
Similar Part No. - NCP5623C_11 |
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Similar Description - NCP5623C_11 |
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