TPS40054_14 Datasheet, PDF (4/37 Pages) Texas Instruments – WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER

TPS40054
TPS40055
TPS40057
SLUS593H – DECEMBER 2003 – REVISED JULY 2012
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ELECTRICAL CHARACTERISTICS (continued)
T_A = –40°C to 85°C, V_IN = 24 V_dc, R_T = 90.9 kΩ, I_KFF = 150 µA, f_SW = 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
CURRENT LIMIT
I_SINK
t_ON
t_OFF
Current limit sink current
Propagation delay to output
Switch leading-edge blanking pulse time⁽³⁾
Off time during a fault (soft-start cycle time)
V_OS
Offset voltage SW vs. ILIM
OUTPUT DRIVER
V_ILIM = 23.7 V, V_SW = (V_ILIM – 0.5 V)
V_ILIM = 23.7 V, V_SW = (V_ILIM – 2 V)
T_A = 25°C
V_ILIM = 23.6 V, 0°C ≤ T_A ≤ 85°C
V_ILIM = 23.6 V, -40°C ≤ T_A ≤ 85°C
8.5
100
–90
–120
–120
10.0 11.5 µA
300
200
ns
7
cycles
–70
–50
–38 mV
–20
t_LRISE
t_LFALL
t_HRISE
t_HFALL
V_OH
Low-side driver rise time
Low-side driver fall time
High-side driver rise time
High-side driver fall time
High-level ouput voltage, HDRV
C_LOAD = 2200 pF
C_LOAD = 2200 pF (HDRV – SW)
I_HDRV = –0.1 A (HDRV – SW)
V_BOOST
–1.5 V
48
24
48
36
V_BOOST
–1.0 V
96
48
ns
96
72
V_OL
Low-level ouput voltage, HDRV
V_OH
High-level ouput voltage, LDRV
I_HDRV = 0.1 A (HDRV – SW)
I_LDRV = –0.1 A
V_BP10
–1.4 V
V_BP10
– 1.0 V
0.75
V
V_OL
Low-level ouput voltage, LDRV
Minimum controllable pulse width
I_LDRV = 0.1 A
0.5
100
150 ns
SS/SD SHUTDOWN
V_SD
Shutdown threshold voltage
V_EN
Device active threshold voltage
BOOST REGULATOR
Outputs off
90
125
160
mV
190
210
245
V_BOOST Output voltage
V_IN= 24.0 V
RECTIFIER ZERO CURRENT COMPARATOR (TPS40054 ONLY)
31.2
32.2 33.5 V
V_SW
Switch voltage
SW NODE
I_LEAK Leakage current⁽³⁾ (out of pin)
THERMAL SHUTDOWN
Shutdown temperature⁽³⁾
T_SD
Hysteresis ⁽³⁾
LDRV output OFF
–10
–5
0 mV
25 µA
165
°C
20
UVLO
V_UVLO
V_DD
V_DD
KFF programmable threshold voltage
UVLO, fixed
UVLO, hysteresis
R_KFF = 28.7 kΩ
6.95
7.50 7.95
7.2
7.5
7.9 V
0.46
(3) Ensured by design. Not production tested.
4
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