Datasheet

TEA1832LTS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 15 December 2014 7 of 23
NXP Semiconductors
TEA1832LTS
GreenChip SMPS control IC
to start switching. If the mains voltage is continuously below the brownout level for at least
32 ms, a brownout is detected. The system immediately stops switching and performs a
restart. The VCC capacitor is discharged to the UVLO level and then charged to V
startup
once before switching recommences (See Figure 5
).
When detecting the external temperature, a current of 200 A (typical) out of the
PROTECT pin flows through the external capacitor and the NTC thermistor. If the
PROTECT voltage at the end of the measuring period is below V
det(PROTECT)
for four
consecutive measuring cycles, the IC detects overtemperature. It activates a latched
protection.
The offset due to the current from the mains is canceled internally by remembering the
sinking current I
in
when measuring the mains voltage (See Figure 6). The stored current is
also used as the input of high/low line compensation.
An internal clamp of 4.1 V (typical) protects this pin from excessive voltages.
Fig 5. Mains detection
Fig 6. External overtemperature protection
DDD
9&&
9
WK89/2
9
VWDUWXS
3527(&7
'5,9(5
EURZQLQ
,
PDLQV
GHWHFW
EURZQRXW
PV PV
DDD
9
GHW3527(&7
9
FODPS3527(&7
O
LQ
O
LQ
,
23527(&7
ODWFKHG
SU
RWHFWLRQ
O
3527(&7
9
3527(&7
$