Designing a high PF wide range LED driver with the HVLED815PF

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Designing a high PF wide range LED driver with the

HVLED815PF

Main characteristics and circuit description

The main characteristics of the LED driver are listed here:



Universal input mains range: 88 ÷ 265 VAC



Output power 10 W continuous operation



Output current: 460 mA at 22 V continuous operation



Overall efficiency up to 85%



Power factor higher than 0.95

2.1

Input specification

The following is a possible design procedure for a high power factor LED driver using the

HVLED815PF device. This design is referred to the schematics of Figure 9. First step is to

define the design specification.

Minimum mains voltage [VAC rms]:

Equation 17

Maximum mains voltage [VAC rms]:

Equation 18

Range (wide, US or European) = WIDE; in the European range maximum output power is

15 W, in an other case must be limited to 9 - 10 W. If the mains voltage range is a single

range, the switch range network can be omitted (R13, D4, D7, Q2, R21, R20, R4). In a wide

mains voltage range the network switches smoothly between the US range and European

range.

Minimum mains frequency [Hz]:

Equation 19

Mean output current [mA]:

Equation 20

Output current ripple [%]:

Equation 21