Datasheet

TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 30
98.5
97
96.5
95
–40 –20 25
Maximum Duty Cycle – %
99
99.5
MAXIMUM DUTY CYCLE
vs
JUNCTION TEMPERATURE
100
85 125
98
97.5
96
95.5
T
J
– Junction Temperature – °C
f = 200 kHz
Figure 31
0.01 0.1 1
– Softstart Capacitance – pF
SOFTSTART CAPACITANCE
vs
SOFTSTART TIME
10 100
10
4
10
3
10
2
100
C
SS
T
SS
– Soft Start Time – ms
Figure 32
V
CC
= 4.5 V
T
DRVHL
T
DRVLH
V
CC
= 7 V,
V
CC
= 25 V
V
CC
= 7 V,
V
CC
= 25 V
V
CC
= 4.5 V
80
60
40
0
–45 –25 25
– Driver Dead Time – ns
100
120
DRIVER DEAD TIME
vs
JUNCTION TEMPERATURE
140
95 135
20
T
DRVLH,
T
DRVHL
T
J
– Junction Temperature – °C
Figure 33
V
I(TRIP)
– Input Voltage PWM Mode – V
T
A
= 125°C
T
A
= 25°C
T
A
= –40°C
13.75
13.25
12.75
12.5
4.5 7
– Current Protection Source Current –
14
14.25
CURRENT PROTECTION SOURCE CURRENT
vs
INPUT VOLTAGE PWM MODE
14.5
25
13.5
13
I
TRIP
Aµ