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RT8532GQW Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT8532GQW Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 14 page  3 RT8532 DS8532-04 January 2014 www.richtek.com © Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Function Block Diagram Operation Enable Control When VIN is higher than the UVLO voltage and EN pin input voltage is higher than rising threshold, the VDC will be regulated around 3.8V if VIN is higher than 3.8V. OSC The switching frequency is adjustable by the external resistor connected between the FREQ pin and GND. PWM Controller This controller includes some logic circuit to control LX N-MOSFET on/off. This block controls the minimum on time and max duty of LX. OCP & OTP When LX N-MOSFET peak current is higher than 2.5A (typically), the LX N-MOSFET is turned off immediately and resumed again at next clock pulse. When the junction temperature is higher than 150 °C (typically), the LX N- MOSFET will be turned off until the temperature is lower than the 120 °C (typically). OVP When OVP pin voltage is higher than 1.2V, the LX N-MOSFET is turned off immediately to protect the LX N-MOSFET. Minimum LED Selection This block detects all LEDx voltage and select a minimum voltage to EA (Error Amplifier). This function can guarantee the lowest of LED pin voltage is around 600mV and VOUT can be boost to the highest forward voltage of LED strings. LED Open Detection If the voltage at LEDx pin is lower than 100mV, this channel is defined as open channel and the Minimum LED Selection function will discard it to regulate other used channels in proper voltage. OSC + + - + - 0.6V OCP LDO PWM Controller Mini LED Selection + - 1.2V + - + - + - …… + - 6 PWM VIN OVP ISET COMP LED1 LED2 AGND LED6 LX R SQ Q PGND FREQ PWMO Generator EN PWM-to-DC LED Open Detection MIX DAC GND VDC OTP |
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