RT8452应用电路(高电压高电流LED驱动器节制器)

RT8452应用电路 (高电压高电流LED驱动器节制器)

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 src="/data/attachment/portal/201009/ET47946201009301356291.GIF">

Note :
Richtek Green products are :
RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.

Features High Voltage Capability : V_IN Up to 36V, V_OUT Up to 48V
Buck, Boost or Buck-Boost Operation
Current Mode PWM with 350kHz Switching Frenquency
Easy Dimming Control : Analog or Digital Converting to Analog with src="/data/attachment/portal/201009/ET47946201009301356292.GIF">

SOP-16

WQFN-16L 3x3

Typical Applications Circuit

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