TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 23 December 2009
3 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
5. Block diagram
Remark:
For the TEA1751L the time-out is latched.
For the TEA1751 the time-out is safe restart.
Fig 1. Block diagram
LOW
VIN
TIMER 50 約
TIMER 4 約
PFC
PROT
VoOVP
VoSTART FB
VoSHORT
LOW VIN
OCP
PFC DRIVER
ENABLE PFC
START STOP PFC
500 mV
SOFT START
PFCGATE
VALLEY
DETECT
ZCS
BLANK
2.50 V
2.7 V
1.25 V
MAX
TIMEOUT
EXT PROT
OTP
OvpFB
LATCH RESET
PROT
EXT PROT
V
startup
V
th(UVLO)
LATCHED
PROTECTION
CHARGE
CONTROL
STARTFB
START STOP
PFC
PROT
VCC GOOD
CHARGE
S
S
S
R
PFC
OSC
PFC PROT
PROT
LATCH
RESET
ENABLE PFC
R
S
Q
VCC GOOD
VoSTART FB
LOW POWER
EXT PROT
SMPS
CONTROL
START
SOFT
START FB
ENABLE FB
BLANK
Q
R
S
FB
OSC
TON MAX
Freq
Red.
EXT PROT
LOW
POWER
TIME
OUT
FB DRIVER
FB GATE
DRV
12
13
PFC DRIVER
PFC GATE
VINSENSE
PFCCOMP
VOSENSE
PFCSENSE
PFCAUX
OTP
CHARGE
VALLEY
DETECT
OTP
INTERNAL
SUPPLY
ZCS
FB GATE
FBAUX
FBSENSE
COUNTER
OVP
OvpFB
1.12 V
3.5 V
7
6
11
8
9
HV
V
CC
16
1
GND
5
3
10
4
FBCTRL
LATCH
80 mV
PFCDRIVER
FBDRIVER
V
startup
V
th(UVLO)
014aaa299
DRV
PROT
ENABLE
FB
80 糀
60 糀
30 糀
60 糀
3.7 V
LOW
POWER
OCP
Freq. Red.
1.25 V
FB
DRIVER
2.5 V
3.5 V
TEMP
100 mV
15 糀
BOOST
BOOST
TIMEOUT
TON MAX
VoSHORT
V
UVLO
SAFE
RESTART
PROTECTION
S
S
R
S (TEA1751 only)
OPP
OPP
OPP
MIN
S (TEA1751L only)
2
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