IR2156 datasheet(21/24 Pages) IRF

21 / 24 page

IR2156(S)&(PbF)

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IGN

Ohms

625

⇒

Results

A fully-functional ballast was designed, built and

tested using the calculated values. The values

were then adjusted slightly in order to fulfill various

ballast parameters (Table 1). The ballast was

designed using the 'Typical Application Schematic'

given on page 1.

Parameter

Description

Value

fph

Preheat Frequency

68kHz

Vph

Lamp Preheat Voltage

460Vpp

tph

Preheat Time

700ms

Rw:Rc

Filament Preheat Ratio

4:1

Vign

Maximum Ignition Voltage

1500Vpp

tign

Ignition Ramp Time

50ms

frun

Running Frequency

47.5kHz

Vrun

Running Lamp Voltage

180Vpk

Running Ballast Input

Power

42W

Table 1, 42W-Quad Biax Ballast Measured Results

Waveforms

Waveform 1. Lamp filament voltage during preheat

Waveform 2. Lamp voltage during preheat, ignition

and run modes

Waveform 3, Half-bridge and current sense voltage

during run mode

Waveform 4, Lamp voltage and current sense pin during

a failure-to-strike lamp fault condition.

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