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TEA1732LTS 데이터시트(PDF) 8 Page - NXP Semiconductors |
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TEA1732LTS 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 20 page TEA1732LTS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 1 — 18 March 2014 8 of 20 NXP Semiconductors TEA1732LTS GreenChip SMPS control IC Leading edge blanking prevents false triggering due to capacitive discharge when switching on the external power switch (see Figure 9). 7.9 Overvoltage protection (pin ISENSE) Accurate overvoltage protection can be realized at the ISENSE pin by sensing the auxiliary voltage. During the primary stroke, diode D4 (see Figure 3) is blocked so that the converter still works under current mode control. During the secondary stroke, the ISENSE voltage represents the output voltage via the resistor divider R5 and R3 (see Figure 3). The ISENSE voltage is sampled 2 s after the gate signal drops to avoid the ringing of the transformer. If the sampled voltage exceeds Vovp(ISENSE) for four consecutive switching cycles, the IC triggers the latched protection. 7.10 Overvoltage protection (pin VCC) An OverVoltage Protection (OVP) circuit is connected to the VCC pin. When the VCC exceeds Vth(OVP) (30 V typical) for four consecutive switching cycles, the IC triggers the latched protection. When VCC drops below Vth(OVP) before count = 4 is reached, the counter is reset to zero. Fig 8. Peak current control Fig 9. Leading edge blanking tleb Vsense(max) VISENSE t 014aaa932 |
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