TEA1530T_AT_AP_1

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 01 — 30 June 2008

9 of 21

NXP Semiconductors

TEA1530T/AT/AP

GreenChip II SMPS control IC

(this only occurs when the mains has been disconnected). The internal

overtemperature protection will also trigger this latch; see also Figure 1.

For the TEA1530T the IC always enters the latched mode protection independent of the

voltage on pin CTRL.

A voltage higher than 3 V on pin PROTECT will always latch the IC. This is independent of

the state of the IC.

7.12 OverTemperature Protection (OTP)

The IC provides accurate OTP. The IC stops switching when the junction temperature

the mains voltage is disconnected for a short period.

7.13 Soft start-up (pin SENSE)

To prevent transformer rattle at start-up or during hiccup, the transformer peak current is

slowly increased by the soft start function. This can be achieved by inserting a resistor

The start level and the time constant of the increasing primary current level can be

below approximately 0.5 V. If the voltage on pin SENSE exceeds 0.5 V, the soft start

is completely switched off, see Figure 7.

I

DM

V

sense max

)

(

I

startup(soft)

R

ss

×

()

–

R

sense

--------------------------------------------------------------------------------

=

τ

R

ss

C

ss

×

=