TEA1732LTS

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© NXP Semiconductors N.V. 2014. All rights reserved.

Product data sheet

Rev. 1 — 18 March 2014

7 of 20

NXP Semiconductors

TEA1732LTS

GreenChip SMPS control IC

7.7 Overpower timer

exceeds 400 mV, an internal timer is started. If the overload situation continues to exist for

more than 180 ms (typical), an OverPower Protection (OPP) is triggered (see Figure 7).

The TEA1732LTS enters the overpower restart mode when the overload time-out is

reached. In overpower restart mode, the VCC capacitor is discharged to UVLO level and

then charged to the start-up level three times before the converter switches again.

7.8 Current mode control (pin ISENSE)

Current mode control is used because it ensures a good line regulation.

Pin ISENSE senses the primary current across external resistor R6 and compares it with

an internal control voltage. The internal control voltage is proportional to the CTRL pin

voltage (see Figure 8).

Fig 7.

Overpower delay