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TEA1833LTS 数据表(PDF) 9 Page - NXP Semiconductors

部件名 TEA1833LTS
功能描述  GreenChip SMPS control IC
Download  24 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TEA1833LTS 数据表(HTML) 9 Page - NXP Semiconductors

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TEA1833LTS
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 1 — 31 August 2015
9 of 24
NXP Semiconductors
TEA1833LTS
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) (36 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.
7.11 Output Short Circuit Protection (OSCP)
A flyback controller operating in CCM at a fixed frequency turns on the primary MOSFET
after a predefined period (see Figure 10). The minimum on-time equals the blanking time.
If after the blanking time the measured peak current (VISENSE) is higher than the Ipeak
regulation level, the driver is switched off.
Fig 8.
Peak current control
Fig 9.
Leading-edge blanking
tleb
Vsense(max)
VISENSE
t
014aaa932


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