TEA1530T View Datasheet(PDF) - NXP Semiconductors.

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TEA1530T

GreenChip II SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1530T/AT/AP

GreenChip II SMPS control IC

protection is reset. The latch is reset as soon as VCC drops below 4.5 V (typical value)

(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

exceeds the thermal shutdown temperature. When VCC drops to Vth(UVLO), capacitor CVCC

is recharged to the Vstartup level, however, switching will not restart. Subsequently, VCC will

drop again to Vth(UVLO).

Operation only recommences when VCC drops below a level of about 4.5 V, typically when

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

and a capacitor between pin SENSE (pin 5) and sense resistor Rsense. An internal current

source charges the capacitor to VSENSE = Istartup(soft) × Rss (about 0.5 V maximum).

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

adjusted externally by changing the values of Rss and Css.

I DM = V-----s--e---n--s---e--(--m----a---x---)---–--R---(-s-I-e--sn-t-s-a-e-r--t-u--p---(-s--o---f-t--)---×-----R---s--s---)

τ = Rss × Css

The charging current Istartup(soft) will flow as long as the voltage on pin SENSE is

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

current source will start limiting current Istartup(soft). At Vstartup, the Istartup(soft) current source

is completely switched off, see Figure 7.

Since the soft start current Istartup(soft) is supplied from pin DRAIN, the Rss value will not

affect VCC current during start-up.

TEA1530T_AT_AP_1

Product data sheet

Rev. 01 — 30 June 2008

© NXP B.V. 2008. All rights reserved.

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