UBA2000T datasheet(6/16 Pages) PHILIPS

6 / 16 page

1996 Jan 03

Philips Semiconductors

Product speciﬁcation

Electronic TL-lamp starter

UBA2000T

Fig.5 Flow chart.

handbook, full pagewidth

MGE003

LOW VOLTAGE DETECTION

Start

charging of C1

S1 is closed

Enable reset

N = 1

CURRENT ALARM !!

Preheat

time

> tprn

VCC > VCC(rst)

VCC < VCC(rst)

VCC > VCC(sl)

Vin > Vign

Disable reset

N: ignition attempt count

> 7

Open int. switches

Switch ext. switch on

1st start ?

(N = 1)

Isense falling edge ?

Isense = Iso

Close int. switches

Turn ext.switch off

(Generate voltage-peak

to ignite TL-lamp)

Standby state

N = N

+ 1

Close int. switches

Turn ext. switch off

(if it was on)

Turn ext. switch off

(if it was on)

yes

Standby state

Preheat

time

> tprf

Isense > Iprot

and t

> td

yes

Isense > Iprot

and t

> td

The ext. switch is closed

when mains voltage is

near its peak value

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