Datasheet
TPS40400
SLUS930B –APRIL 2011– REVISED OCTOBER 2011
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise stated, these specifications apply for –40°C ≤ T
J
≤ 125°C, V
DD
= 12 Vdc, FREQUENCY_SWITCH = 600 kHz
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SOFT-START
Soft-start time
(3)
Factory default setting 2.7 3.1 3.5 ms
t
SS
Accuracy 600 μs ≤ t
SS
≤ 9 ms –15% 15%
ERROR AMPLIFIER
GBWP Gain bandwidth product
(4)
15 20 MHz
A
OL
DC gain
(4)
60 dB
I
IBFB
Input bias current: FB (out of pin) 0 100 nA
I
IBT
Input bias current: TRACK (out of pin) 0 250 nA
I
EAOP
Output source current V
FB
= 0 V, V
COMP
≥ 2 V 1
mA
I
EAOM
Output sink current V
FB
= 2 V, V
COMP
≤ 0.3 V 1
V
COMPH
Error amplifier high output voltage V
FB
= 0 V 3.8 V
V
COMPL
Error amplifier low output voltage V
FB
= 2 V 50 mV
V
TRACK(ofst)
TRACK pin offset voltage –5 +5 mV
CURRENT SENSE AMPLIFIER
I
ISNS+
ISNS+ bias current 200 nA
I
ISNS–
ISNS– bias current 100 μA
V
ICM
Input common mode range 0.45 15 V
AO
CM
Common mode gain –80 dB
V
LIN
Input linear range, VISNS+ - VISNS-
(5)
–45 110 mV
CURRENT LIMIT PROTECTION
t
OFF
Off time between restart attempts 6 × t
SS
ms
V
CS+
– V
CS–
voltage that trips OC fault function Factory default settings
(5)
, T
J
= 25°C 27 30 33 mV
3 V ≤ V
VDD
≤ 20 V,
–10% 10%
30 mV ≤ V
ILIMTH
≤ 110 mV, T
J
= 25°C
Threshold accuracy
V
ILIMTH
3V ≤ V
VDD
≤ 20 V, V
ILIMTH
≤ 30 mV,
–3 3 mV
T
J
= 25°C
Comparator offset V
ILIMTH
= 30 mV, T
J
= 25°C –3 3 mV
Temperature coefficient
(4)
4000 ppm/°C
t
DLYOC
Overcurrent delay 3-mV overdrive, T
J
= 25°C 155 ns
V
CS+
– V
CS–
voltage that sets warning status Factory default settings, T
J
= 25°C 12 15 18 mV
3 V ≤ V
VDD
≤ 20V,
–10% 10%
1.9 mV ≤ V
ILIMTH
≤ 120 mV, T
J
= 25°C
Threshold accuracy
V
ILIMW
3V ≤ V
VDD
≤ 20 V, V
ILIMTH
< 30 mV,
–3 3 mV
T
J
= 25°C
Comparator offset V
ILIMTH
= 20 mV, T
J
= 25°C –3 3 mV
Temperature coefficient
(4)
4000 ppm/°C
t
DLYOCW
Overcurrent warning delay
(4)
3-mV overdrive 250 ns
(3) See applications section for more information regarding soft-start time setting.
(4) Ensured by design. Not production tested.
(5) The entire current ripple waveform must reside inside the linear range for current reading results to be accurate. DC current level must
be zero or greater for accurate results. Current sense does not support applications that sink current. Transient voltages (such as ripple)
are permitted to go below 0 V, but must be within the specified linear range.
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