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TC6501P045VCT Arkusz danych(PDF) 9 Page - Microchip Technology |
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TC6501P045VCT Arkusz danych(HTML) 9 Page - Microchip Technology |
9 / 20 page www.microchip.com/lighting LED Lighting Solutions Design Guide 9 LED Lighting Solutions Generating PWM Control Signals There are multiple ways to generate PWM control signals to control power circuits. ■ Devices with the Capture-Compare-PWM (CCP) module can generate PWM signals to control power circuits using an on-chip digital timebase. The signal pulse width is controlled by the MCU clock and a duty cycle register. ■ The Enhanced CCP (ECCP) module allows one PWM signal to control 2 or 4 output pins for half-bridge or H-bridge control, respectively. ■ Devices that have a comparator and the ECCP module can use the comparator signal to control the turn-off time of the PWM signal. ■ Devices with comparators and a PWM SR latch can use comparator signals and/or clock pulses to turn the latch output on and off. PIC12HV615 VDD Buck Topology Driver Drive Level VSS VBUS Other Device Options: PIC12F1822 PIC16F1823 Comparator Buck LED Driver Using a Comparator ■ An external PWM peripheral IC may be used. This option is useful when multiple high speed PWM channels are required. ■ PWM signals can be generated using software and I/O pins. This option is less costly when PWM frequency and duty cycle resolution requirements are not too high. A PIC microcontroller with an on-chip comparator such as the PIC12F609 can be used to implement a simple LED driver. The PIC12HV609 adds an internal regulator, allowing operation from a DC bus higher than 5 volts. Literature on the Web ■ AN874 – Buck Configuration High-Power LED Driver, DS00874 ■ AN1074 – Software PWM Generation for LED Dimming and RGB Color Applications, DS01074 R B G PIC12HV615 ADC Input Color Set RGB LED 50 mA Other Device Options: PIC12F1822 PIC16F1827 User Interface VIN RGB Color LED Application Using PIC12HV615 |
Podobny numer części - TC6501P045VCT |
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Podobny opis - TC6501P045VCT |
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