TEA1832TS

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

Product data sheet

Rev. 1 — 16 December 2014

5 of 23

NXP Semiconductors

TEA1832TS

GreenChip SMPS control IC

7.

Functional description

7.1 General control

The TEA1832TS contains a controller for a flyback circuit. A typical configuration is shown

in Figure 3.

7.2 Start-up and UnderVoltage LockOut (UVLO)

Initially, the capacitor on the VCC pin, C3, is charged from the high-voltage mains via

resistor R1.

(11

A typical). When the voltage on the VCC pin reaches V

starts switching. An internal soft-start time of 3.5 ms allows the ISENSE peak voltage to

increase gradually to prevent audible noise. In a typical application, the auxiliary winding

of the transformer takes over the supply voltage.

If a protection is triggered, the controller stops switching. Depending on the protection

triggered, it either causes a restart or latches the converter to an off-state.

The OPP, UVLO, brownin/brownout, maximum duty cycle protections cause a safe restart.

The internal and external OVP and the internal and external OTP latch the converter to an

off-state.

A restart protection disables the switching of the IC. The supply voltage of the IC drops to

the UVLO level. When the UVLO level is reached, the IC switches to Power-down mode,

where it consumes a low supply current (11

A typical). The VCC capacitor is recharged

via R1 until the VCC start-up level is reached. The IC starts switching again.

The OPP protection performs a slow restart to lower the average input power during a

fault condition. The restart sequence that discharges and recharges the VCC capacitor is

performed three times, before switching recommences (see Figure 4).

Fig 3.

TEA1832TS typical configuration