TEA1716T データシートの表示（PDF） - NXP Semiconductors.

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TEA1716T

Resonant power supply control IC with PFC

NXP Semiconductors. 

NXP Semiconductors

UBA2071; UBA2071A

Half bridge control IC for CCFL backlighting

(H)2(EN)

EN

(H)1(EN)

(L)(EN)

0

GH VSH

GL

0

0.5 T

disabled

7.5 T

3 / fsw(min)

T

1 / fsw(max)

DC blocking capacitor charging

Fig 7. DC blocking capacitor charging mode

7.5 T

3 / fsw(min)

initial ignition sweep

and normal mode

014aaa252

Remark: Due to the nature of the charging sequence, VCblock will automatically be

charged to 0.5 × VHV (when given enough time). If the IC is kept in DC blocking capacitor

charging mode longer than necessary, VCblock will remain 0.5 × VHV. Therefor the time

constant made by R1 and C1 in example A in Figure 6, is not critical. However, since

VCblock cannot become more than 0.5 × VHV, it is important to take a lower target value for

VCblock than 0.5 × VHV (with enough margin) in examples B and C of Figure 6, otherwise

the IC may get stuck in DC blocking capacitor charging mode.

8.8 Lamp (re-)ignition

The IC starts at its maximum switching frequency fsw(max). The lamp current and the lamp

voltage control loops are enabled. The frequency is swept down towards the minimum

frequency fsw(min), see Figure 9. During this initial ignition frequency sweep the lamp

voltage will increase as the frequency comes closer to the resonant frequency of the

unloaded resonance circuit. Once the ignition voltage Vign is reached the lamps will ignite

and the lamp voltage will drop4 to the voltage of the loaded resonance curve, see

Figure 8.

4. For CCFLs only.

UBA2071_A_1

Product data sheet

Rev. 01 — 23 June 2008

© NXP B.V. 2008. All rights reserved.

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