TEA152X_3

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 03 — 23 March 2009

8 of 17

NXP Semiconductors

TEA152x

SMPS ICs for low-power systems

8.9 OverTemperature Protection (OTP)

An accurate temperature protection is provided in the device. When the junction

temperature exceeds the thermal shut-down temperature, the IC stops switching. During

thermal protection, the IC current is lowered to the start-up current. The IC continues

normal operation as soon as the over temperature situation has disappeared.

8.10 OverVoltage Protection (OVP)

Overvoltage protection can be achieved in the application by pulling pin REG above its

normal operation level. The current primary stroke is terminated immediately, and no new

primary stroke is started until the voltage on pin REG drops to its normal operation level.

Pin REG has an internal clamp. The current feed into this pin must be limited.

8.11 Output characteristics of complete power plug

Typical characteristics:

with primary sensing, is approximately 8 % (mainly dependent on the transformer

coupling). The accuracy with secondary sensing is defined by the accuracy of the

external components. For safety requirements in case of opto coupler feedback loss,

the primary sensing remains active when an overvoltage circuit is connected.

complete converter designed for universal mains.

of 50 % under normal operating conditions, and a minimized dead time. The

magnitude of the ripple in the output voltage is determined by the frequency and duty

factor of the converter, the output current level and the value and ESR of the output

capacitor.

8.12 Input characteristics of complete power plug

Typical characteristics: