RT8452应用电路 (高电压高电流LED驱动器控制器)

The RT8452 is a current mode PWM controller designed to drive an external MOSFET for high current LED applications. With a current sense amplifier threshold of 190mV, the LED current is programmable with one external current sense resistor. With the maximum operating input voltage of 36V and output voltage up to 48V, the RT8452 is ideal for buck, boost or buck-boost operation.

Note :

SOP-16

Figure 1. Analog Dimming in Boost Configuration

Figure 2. PWM to Analog Dimming in Boost Configuration

Figure 3. True PWM Dimming in Boost Configuration

Figure 4. Analog Dimming in Buck-Boost Configuration

Figure 5. Analog Dimming in Buck Configuration