UBA20270 Просмотр технического описания (PDF) - NXP Semiconductors.

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UBA20270

600 V Driver IC for dimmable compact fluorescent lamps

NXP Semiconductors. 

NXP Semiconductors

UBA20270

600 V Driver IC for dimmable compact fluorescent lamps

7. Functional description

The UBA20270 is an IC for driving external half-bridge MOSFETs in self ballasted

high-power CFL and their derivatives. The UBA20270 is equipped with a dimming control

input that has a logarithmic corrected natural dimming function. This function enables a

less sensitive brightness control of the lamp at low dim levels.

The UBA20270 is rated up to a maximum continuous rectified mains voltage of 500 V

(peak 600 V). The UBA20270 includes all the necessary functions for preheat, ignition,

boost, and on-state operation of the lamp. In addition, the UBA20270 includes several

protection measures that safeguard the functioning of the CFL and controller. The

controller states are shown in Figure 3.

VDD = 0

RESET STATE

HOLD = 0

VDD < VDD(rst)

VDD > VDD(rst)

VDD < VDD(rst)

START-UP STATE

VCP < Vth(rel)CP

POWER-DOWN STATE

(1)

PREHEAT STATE

preheat time

completed

IGNITION STATE

(2)

HOLD STATE

(3)

HOLD = 1

(4)

Ignition_Detected

(6)

BOOST AND BURN

STATES

(5)

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(1) VDD > VDD(start) AND Vi(DCI) > Vth(start)DCI AND (HOLD = 0 OR VCP < Vth(rel)CP)

(2) VDD < VDD(stop) OR Vi(DCI) < Vth(start)DCI  Vth(hys)DCI

(3) (End of ignition time AND HOLD = 0) OR VDD < VDD(stop) OR Vi(DCI) < Vth(start)DCI  Vth(hys)DCI

(4) End of ignition time AND HOLD = 1

(5) VCP < Vth(pd)CP OR overcurrent fault time > 1⁄10 tph OR fbridge(max) detected in capacitive mode

(6) VDD < VDD(stop) OR Vi(DCI) < Vth(start)DCI  Vth(hys)DCI

Fig 3. State diagram

UBA20270

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 2 — 8 September 2011

© NXP B.V. 2011. All rights reserved.

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