SLUS157L − DECEMBER 1999 − REVISED APRIL 2008
UCC1895
UCC2895
UCC3895
ELECTRICAL CHARACTERISTICS
VDD = 12 V, RT = 82 kΩ, CT = 220 pF, RDELAB = 10 kΩ, RDELCD = 10 kΩ, CREF = 0.1
µF,
CVDD = 0.1
µF
and no load on the outputs, TA = TJ. TA = 0°C to 70°C for UCC3895x, TA = −40°C to 85°C for UCC2895x and TA = −55°C to 125°C
for the UCC1895x. (unless otherwise noted)
PARAMETER
CURRENT SENSE
ICS(bias)
Current sense bias current
Peak current threshold
Overcurrent threshold
Current sense to output delay
SOFT-START/SHUTDOWN
ISOURCE
ISINK
Softstart source current
Softstart sink current
Softstart/disable comparator threshold
ADAPTIVE DELAY SET (ADS)
ADS = CS = 0 V
DELAB/DELCD output voltage
tDELAY
OUTPUT
VOH
VOL
t
R
t
F
High−level output voltage (all outputs)
Low-level output voltage (all outputs)
Rise time(1)
Fall time(1)
(1) Ensured by design. Not production tested.
(2) Minimum phase shift is defined as:
t
f (OUTC)
*
t
f (OUTA)
F
+
180
or
F
+
180
t
PERIOD
IOUT = −10 mA,
IOUT = 10 mA
CLOAD = 100 pF
CLOAD = 100 pF
VDD to output
250
150
20
20
400
250
35
35
mV
mV
ns
ns
Output delay(1)(3)
ADS bias current
ADS = 0 V,
ADS = CS = 0 V
0 V < ADS < 2.5 V,
0 V < CS < 2.5 V
CS = 2.0 V
0.45
1.9
450
−20
0.50
2.0
560
0.55
2.1
620
20
V
V
ns
µA
SS/DISB = 3.0 V,
SS/DISB = 3.0 V,
CS = 1.9 V
CS = 2.6 V
−40
325
0.44
−35
350
0.50
−30
375
0.56
µA
µA
V
0V
≤
CS
≤
2.3 V,
DELAB=DELCD=REF
0 V < CS < 2.5 V,
0 V ADS < 2.5 V
−4.5
1.90
2.4
2.00
2.5
75
20
2.10
2.6
110
µA
V
V
ns
TEST CONDITIONS
MIN
TYP
MAX
UNITS
t
f (OUTC)
*
t
f (OUTB)
t
PERIOD
where
t
f(OUTA)
= falling edge of OUTA signal, t
f(OUTB)
= falling edge of OUTB signal
t
f(OUTC)
= falling edge of OUTC signal, t
f(OUTD)
= falling edge of OUTD signal
t
PERIOD
= period of OUTA or OUTB signal
(3) Output delay is measured between OUTA/OUTB or OUTC/OUTD. Output delay is defined as shown below where:
t
f(OUTA)
= falling edge of OUTA signal, t
r(OUTB)
= rising edge of OUTB signal
t
PERIOD
OUTA
tDELAY = tf(OUTC) − tf(OUTA)
OUTA
tDELAY = tR(OUTB) − tf(OUTA)
OUTB
OUTC
Same applies to OUTB and OUTD
Same applies to OUTC and OUTD
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