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TEA1731LTS Datasheet(PDF) 4 Page - NXP Semiconductors |
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TEA1731LTS Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 19 page TEA1731LTS All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 2 — 16 August 2012 4 of 19 NXP Semiconductors TEA1731LTS GreenChip SMPS control IC 7. Functional description 7.1 General control The TEA1731LTS 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. As long as VCC is below Vstartup, the IC current consumption is low (10 A typical). When VCC reaches Vstartup, the IC first waits for the PROTECT pin to reach the Vdet(PROTECT)(L) voltage. When Vdet(PROTECT)(L) is reached, the IC charges the ISENSE pin to the Vstart(soft) level and then starts switching. In a typical application, the auxiliary winding of the transformer takes over the supply voltage (see Figure 4). 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. 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 (10 A typical). The switching recommences when the VCC capacitor is recharged to Vstartup via R1. When a latched protection is triggered, the TEA1731LTS immediately enters Power-down mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage (Vrst(latch) +0.9 V). Fig 3. TEA1731LTS typical configuration DDD ,& ,6(16( '5,9(5 *1' 9&& 3527(&7 &75/ ' & 5 5 ' & 7 6 5 2 & 2 = ' 5 & 5 5 5 & |
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