30V 0.5A Hysteretic Buck LED Driver

The TS_LEDDRV_30V0A5_X8 is a non-synchronous hysteretic Buck LED driver. It operates with an input voltage range of 20 VDC to 30 VDC. A constant output current is set by hysteretic control using a high-side current sense resistor and a low-side drain current sensing circuit.

It supports hybrid PWM and hysteretic dimming with an approximate 1000:1 resolution and up to 500 mA LED current at 18 V LED string voltage. PWM dimming is applied for currents up to 102.5 mA. Further current increase is realized by hysteretic control.

A low-side NMOS switch with typically 400 mΩ is integrated. The circuit provides a fault detection mechanism at the FET`s DRAIN pin that flags shorts against the rails. The operating switching frequency can range between 150 kHz and 4 MHz depending on the input voltage, buck inductance and LED current range.

The TS_LEDDRV_30V0A5_X8 also supports a direct NMOS switch control mode that can be used in various applications such as switching external constant current regulators.

A low voltage power supply of 3.3 V and bandgap voltage of 1.246 V are needed for operation.

Technology: X-FAB XT018-0.18µm BCD-on-SOI CMOS

OPERATING CONDITIONS

SPECIFICATION