SSL21084T/1,118 데이터 시트보기 (PDF) - NXP Semiconductors.

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SSL21084T/1,118

GreenChip drivers for LED lighting

NXP Semiconductors. 

NXP Semiconductors

SSL2108X

Drivers for LED lighting

VGATE

internal MOSFET switch

VD

VIN

0

magnetization

demagnetization

IL

0

1

2

3

t0

t1 t2

t3

T

Fig 5. Buck waveforms and valley detection

VOUT

valley

4

t00

001aan699

8.5 Protections

The IC has the following protections:

• UnderVoltage LockOut (UVLO)

• Leading-Edge Blanking (LEB)

• OverCurrent Protection (OCP)

• Internal OverTemperature Protection (OTP)

• Brownout protection

• Short-Winding Protection (SWP)

• Output Short Protection (OSP)

• LED overtemperature control and protection

The SWP and the OSP are latched protections. These protections cause the IC to halt

until a reset (caused by power cycling) is executed. When Vcc drops lower than Vcc(rst), the

IC resets the latch protection mode. The internal OTP and LED over temperature

protections are safe-restart protections. The IC halts, causing VCC to fall lower than

VCC(stop), and instigates start-up. Switching starts only when no fault condition exists.

8.5.1 UnderVoltage LockOut (UVLO)

When the voltage on the VCC pin drops lower than Vcc(stop), the IC stops switching. An

attempt is then made to restart by supplying VCC from the HV pin voltage.

SSL2108X

Preliminary data sheet

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

Rev. 1 — 9 September 2011

© NXP B.V. 2011. All rights reserved.

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