ZD832,pdf datasheet (AC-DC Con

The ZD832 is a high voltage, TransformerFree™ AC-DC
constant current driver for driving a string of white or RGB
LEDs in series. It operates from an universal input voltage
of 85VAC to 170VAC, or 170VAC to 240VAC and generates
a programmable constant output current. The high operating
voltage of ZD832, along with its linear control architecture
eliminates the need for an external inductor, transformer and
rectifying diode bridge. The output current level is set by a
single resistor and can be set as high as 30mA. Dimming
control can be accomplished by using pulse-width modulation
signal with varying duty cycle on the PWM pin or by applying
an analog DC voltage on the ISET pin. Thermal and overvoltage
circuitry protects the internal power transistors from
excessive power dissipation.