Datasheet

TPS2394
SLVSAA9 –AUGUST 2010 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
SOURCE = -48 V, UV = 2.5 V, OV = 0.5 V, SENSE = 0 V, RAMP = 0 V, T
A
= −40°C to 85°C (unless otherwise noted)
(1)(2)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
RAMP GENERATOR
I
SRC1
RAMP source current, slow turn-on rate RAMP – SOURCE = 0.25 V –800 –550 –300 nA
I
SRC2
RAMP source current, normal rate RAMP – SOURCE = 1 V and 3 V –11.3 –10 –8.5 µA
V
OL
Low-level output voltage UV = SOURCE 5 mV
A
V
Voltage gain, relative to SENSE 0 V < RAMP – SOURCE < 5 V 9.5 10 10.7 mV/V
OVERLOAD COMPARATOR
V
TH_OL
SENSE current overload threshold 100 120 140 mV
t
RSP
Response time SENSE – SOURCE = 200 mV 2 4 7 µs
FAULT TIMER
V
OL
FLTTIM low−level output voltage, to SOURCE UV = –48 V 5 mV
I
CHG
FLTTIM charging current, current limit mode FLTTIM – SOURCE = 2 V –54 –50 –41 µA
V
FLT
FLTTIM fault threshold voltage to SOURCE 3.75 4.00 4.25
V
V
RST
Fault reset threshold to SOURCE 0.5
I
DSG
FLTTIM Discharge current, retry mode FLTTIM – SOURCE = 2 V 0.38 0.75 µA
SENSE − SOURCE = 80 mV,
D Output duty cycle during retry cycles 1% 1.5%
FLTTIM – SOURCE = 2 V
I
RST
FLTTIM discharge current, timer reset mode FLTTIM – SOURCE = 2 V, SENSE = V 1 mA
LOGIC OUTPUTS (FLT, PG)
I
OHFLT
FLT high-level output leakage current UV = –48 V, FLT – SOURCE = 80 V –10 10
µA
I
OHPG
PG high-level output leakage current UV = –45 V, PG – SOURCE = 80 V –10 10
SENSE–SOURCE = 80 mV,
FLT ON resistance 50 80 Ω
FLTTIM–SOURCE = 5 V, I
(FLT)
= 1 mA
R
DS(on)
PG ON resistance UV = –48 V, I
O
(PG) = 1 mA 50 80 Ω
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