TEA1716T 데이터 시트보기 (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

• OverCurrent Protection (OCP),

• bad contact or ARCing (ARC),

• Ignition Failure (IF),

• open or shorted current feedback (IFB pin open/short),

• open or shorted voltage feedback (VFB pin open/short)

• Hard Switching (HS).

There are also two pins, the NONFAULT pin and the COMM pin, via which a fault can be

signalled to the IC, by an external circuit.

enable

low_supply

NONFAULT-pin_fault_signal

IFB_open / short

over_voltage_extra

over_voltage

VFB_open / short

over_current

f_max

arcing_detected

COMM-pin_fault_signal

hard_switching_detected

FILTER

FAULT-

stop

TIMER

ic_off

lamp_current_detected

f_min

R lamp_on

Q

S

ignition_

failure

R

Q

S

DELAY enable_PWM_

dimming

Fig 15. Simplified control schematic

014aaa111

The fault protection functions are explained in the following sections.

8.14.1 Voltage feedback open or short protection

If the VFB pin is left open or shorted to SGND, the voltage at the VFB pin will drop below

the VFB open/short protection threshold voltage Vth(osp)VFB, due to the internal bias

resistor Ri(VFB). If the voltage at the VFB pin is below Vth(osp)VFB continuously or only

during a part of each switching cycle the PWM dimming is disabled and the fault timer is

started.

To protect the inverter transformer(s) against overvoltage if the voltage feedback loop is

broken, the frequency stays at fsw(max) or is increased by discharging the capacitor at the

CVFB pin (by Idch(CVFB)). For this function the voltage at the VFB pin has to be below

Vth(osp)VFB during more than 50 % of each switching cycle.

UBA2071_A_1

Product data sheet

Rev. 01 — 23 June 2008

© NXP B.V. 2008. All rights reserved.

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