UBA2017 datasheet(8/29 Pages) PHILIPS

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UBA2017

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Product data sheet

Rev. 2 — 15 May 2012

8 of 29

NXP Semiconductors

UBA2017/UBA2017A

600 V fluorescent lamp driver with linear dimming function

Fig 6.

State diagram

reset OR disable

VDD high AND

enable AND

NOT(overtemp)

GLHB AND

(reset OR disable)

GLHB AND

(VDD low

OR overtemp)

reset

restart

NOT(reset)

Preheat time completed

f low OR

ignition detected

aaa-001480

Non oscillating states

(IC is off)

Low power consumption

GHHB and GPFC low

Oscillating states

(IC is on)

Reset state

GLHB low

stop latch and ignition

attempt counter are reset

Preheat state

EOL disabled

frequency is decreased

until HB preheat current or

the set value for the

preheat frequency

is reached

Power on

Standby state

GLHB high

Stop state

GLHB low

fast fault

fault timeout

Other definitions:

enable = (VFFPRHT > Vth(en)(FFPRHT))

disable = NOT(enable)

ignition detected = (VIFB > Vth(lod)(IFB)) AND (VVFB < Vth(lod)(VFB))

Auto-restart

state

GLHB low

Ignition state

EOL disabled

frequency is decreased

as long as no lamp overvoltage

or HB overcurrent

is detected

Burn state

ignition attempt counter is reset

EOL protection enabled

Frequency determined by lamp

current regulation loop

fault timeout

AND

(ignition attempts = 1)

fault definitions:

overtemp =

fast fault =

slow fault =

the fault timer is started by slow fault and runs as

long as slow fault continues. NOT(slow fault) resets

the fault timer.

(1)(BURN state only)

{set} T > Tth(act)otp

{reset} T < Tth(rel)otp

over voltage extra OR

capacitive mode OR

(over current lamp AND f high) OR

coil saturation(1)

CPT low OR

VFB low OR

over voltage OR

(over voltage end of life AND

NOT (deep dimming))(1) OR

coil saturation OR

hardswitching OR

asymetrical end of life(1)

fault timeout

AND

(ignition attempts = 2)

Supply voltage definitions

reset = (VDD < Vrst(VDD))

restart = (VDD < Vrestart(VDD))

VDD low = (VDD < Vstop(VDD))

VDD high = (VDD > Vstartup(VDD))

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