SLUS646J
–
NOVEMBER 2005
–
REVISED JULY 2011
ELECTRICAL CHARACTERISTICS (continued)
VDD = 15 V, 0.1-μF capacitor from VDD to GND, 3.3-nF capacitor from SS to GND charged over 3.5 V, 500-Ω resistor from
OVP to -0.1 V, FB = 4.8 V, STATUS = not connected, 1-nF capacitor from OUT to GND, CS = GND, T
A
= -40°C to 105°C,
(unless otherwise noted)
PARAMETER
Current Sense (CS)
A
CS(FB)
(2)
TEST CONDITIONS
QR mode
V
FB
= 2.4 V, V
SS
= 0 V
CS = 1.0 V
PULSE
CS = 1.45 V
PULSE
CS = 0.1 V, V
SS
= 0 V
SS mode, V
SS
≤
2.0 V, via FB
OVP = -300
μA
QR mode, peak CS voltage
Peak CS voltage + CS offset
V
SS
= GND
V
SS
= 0.5 V
Output switching start
I
OVP
threshold, OUT = HI
V
FB
= 4.8 V, V
SS
= 5.0 V, I
OVP(on)
, = -300
μA
V
OVP
threshold, OUT = LO
MIN
TYP
2.5
MAX
UNIT
V/V
Gain, FB =
ΔV
FB
/
ΔV
CS
Shutdown threshold
CS to output delay time (power limit)
CS to output delay time (over current
fault)
CS discharge impedance
1.13
100
50
25
0.35
-165
0.70
1.05
-8.3
2.0
0.8
-512
-125
3.37
130
1.25
175
100
115
0.40
-150
0.81
1.20
-6.0
5.0
1.0
-450
1.38
300
150
250
0.45
-135
0.92
1.37
-4.5
10
1.2
-370
-25
V
ns
Ω
V
μA
V
V
CS(os)
Power Limit (PL)
I
PL(cs)
V
PL
Soft Start (SS)
I
SS(chg)
I
SS(dis)
V
SS
I
OVP(line)
V
OVP(on)
V
OVP(load)
CS offset
(2)
CS current
CS working range
PL threshold
Softstart charge current
Softstart discharge current
Switching ON threshold
Line overvoltage protection
OVP voltage at OUT = HIGH
Load overvoltage protection
Thermal shutdown (TSP) temperature
(3)
Thermal shutdown hysteresis
μA
mA
V
μA
mV
V
Overvoltage Protection (OVP)
3.75
140
15
4.13
150
Thermal Protection (TSP)
°C
OUT
t
RISE
t
FALL
(2)
(3)
Rise time
Fall time
10% to 90% of 13 V typical out clamp
50
10
75
20
ns
R
SCT
and C
CST
are not connected in the circuit for maximum and minimum duty cycle tests, current sense tests and power limit tests.
Ensured by design. Not production tested.
4
Copyright
©
2005–2011, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
