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MAX16803ATE+ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX16803ATE+ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 11 page High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator 6 _______________________________________________________________________________________ Functional Diagram MAX16803 ENABLE EN REFERENCE GENERATOR REGULATOR IN V5 DIFFERENTIAL SENSE AMPLIFIER THERMAL SHUTDOWN DIM I_REG IN OUT CS+ CS- Detailed Description The MAX16803 is a high-current regulator capable of providing up to a total of 350mA of current to one or more strings of HB LEDs. A wide operating input volt- age range of +6.5V to +40V makes the MAX16803 ideal for automotive applications. A +5V regulated out- put provides up to 4mA of current to power external cir- cuitry. In addition, the MAX16803 features thermal and output short-circuit protection. The wide operating volt- age range helps protect the MAX16803 against large transients such as those found in load-dump situations up to 40V. The MAX16803 uses a feedback loop to control the out- put current. The differential voltage across the sense resistor is compared to a fixed reference voltage, and the error is amplified to serve as the drive to the internal power series pass device (see the Functional Diagram). The regulation point is factory-set at (VCS+ - VCS-) = 203mV ±3.5%. The regulated current is user defined by the value of RSENSE. The MAX16803 is a current controller internally opti- mized for driving the impedance range expected from one or more HB LEDs. +5V Regulator The MAX16803 includes a fixed +5V output regulator that delivers up to 4mA of load current throughout the +6.5V to +40V input voltage range. Connect a 0.1µF compensation capacitor from V5 to ground. Shorting V5 to ground disables the thermal shutdown. When EN is low, V5 is off. V5 stays on during PWM dimming. Thermal Protection The MAX16803 enters a thermal-shutdown mode in the event of overheating. This typically occurs in overload or output short-circuit conditions. If the junction tempera- ture exceeds TJ = +155°C (typ), the internal thermal-pro- tection circuitry turns off the series pass device. The MAX16803 recovers from thermal-shutdown mode once the junction temperature drops by 23°C (typ). The part therefore protects itself by thermally cycling in the event of a short-circuit or overload condition. Applications Information Programming the LED Current The MAX16803 uses a sense resistor across CS+ and CS- to set the LED current. The differential sense ampli- fier connected across RSENSE provides ground-loop immunity and low-frequency noise rejection. The LED current is given by ILED = VSENSE / RSENSE |
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