TEA18361LT

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Product data sheet

Rev. 2 — 12 December 2013

10 of 29

NXP Semiconductors

TEA18361LT

GreenChip SMPS control IC

[1]

counter is changed from the driver pulse to 1 ms internal pulse.

When the system stops switching, the VCC pin is not supplied via the auxiliary winding

HV pin (see Table 3).

Releasing the latched protections or shortening the safe restart timer can be achieved by

removing or shorting the mains voltage. This is called a fast latch reset. It is mainly used

to shorten the test time in production (See Section 7.6.8).

7.6.1 OverPower Protection (OPP)

The overpower function is used to realize a maximum output power which is nearly

constant over the full input mains.

The overpower compensation circuit measures the input voltage via the AUX pin and

outputs two reference voltages (see Figure 1). If the measured voltage at the ISENSE pin

OverPower counter starts. Both reference voltages depend on the measured input

voltage. In this way the system allows 150 % overpower over the rated power on a

cycle-by-cycle base. 100 % overpower triggers the overpower counter of 200 ms. Figure 9

shows the overpower protection curves.

Table 3.

Protections

Protection

Delay

Action

AUX open

no

wait until AUX is

connected

no

brownout

30 ms

wait until

yes

maximum on-time

no

safe restart 800 ms

yes

OTP internal

no

latch

yes

OTP via the PROTECT

pin

2 ms to 4 ms

latch

yes

OVP via the AUX pin

4 driver pulses[1]

latch

yes

overpower

compensation

no

via AUX;

cycle-by-cycle

-

overpower time-out

40 ms or 200 ms

latch

yes

overpower + UVLO

no

latch

yes

overcurrent protection

blanking time

cycle-by-cycle

no

UVLO

no