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TEA1738T Datasheet PDF : 21 Pages
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NXP Semiconductors
TEA1738T; TEA1738LT
GreenChip SMPS control IC
Table 5. Characteristics …continued
Tamb =2 5 °C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into
the IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Ncy(sw)δmax
Number of switching
cycles with maximum
duty cycle
7
-
8
Vstart(red)f
frequency reduction pin CTRL transfer
-2
.7
-
V
start voltage
between high and
medium power
pin CTRL going to low
1.5
1.8
2.1
V
power
Vδ(zero)
zero duty cycle voltage pin CTRL
Overpower protection (pin OPTIMER)
1.25
1.55
1.85
V
Vprot(OPTIMER)
protection voltage on
pin OPTIMER
2.4
2.5
2.6
V
Iprot(OPTIMER)
protection current on no overpower situation
100
150
200
μA
pin OPTIMER
overpower situation
−12.2 −10.7
−9.2
μA
Restart timer (pin OPTIMER)
Vrestart(OPTIMER)
restart voltage on pin
OPTIMER
low level
high level
0.8
1.2
1.6
V
4.1
4.5
4.9
V
Irestart(OPTIMER)
restart current on pin charging OPTIMER
OPTIMER
capacitor
−127
−107
−87
μA
discharging OPTIMER
capacitor
−0.1
0
0.1
μA
Current sense (pin ISENSE)
Vsense(max)
Vth(sense)opp
maximum sense
voltage
overpower protection
sense threshold
voltage
ΔV/Δt= 50 mV/μs;
VVINSENSE =0 .78V
ΔV/Δt = 200 mV/μs;
VVINSENSE =0 .78V
0.48
0.51
0.54
V
0.50
0.53
0.56
V
370
400
430
mV
ΔVISENSE/Δt
slope compensation ΔV/Δt= 50 mV/μs, high
-1
9
-
voltage on pin ISENSE power mode
mV/μs
tleb
leading edge blanking
time
250
300
350
ns
Overpower compensation (pin VINSENSE and pin ISENSE)
Iopc(ISENSE)
overpower
VVINSENSE =1V ;
-0
.28
-
μA
compensation current Vsense(max) > 400 mV
on pin ISENSE
VVINSENSE=3 V;
-1
.7
-
μA
Vsense(max) > 400 mV
Soft start (pin ISENSE)
Istart(soft)
Vstart(soft)
soft start current
soft start voltage
VCTRL =4V ;
enable voltage
−63
−55
−47
μA
-V
sense(max) -V
Rstart(soft)
soft start resistance
Driver (pin DRIVER)
12
-
-
kΩ
TEA1738T_TEA1738LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 14 January 2011
© NXP B.V. 2011. All rights reserved.
14 of 21
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