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SLUS157L − DECEMBER 1999 − REVISED APRIL 2008
ELECTRICAL CHARACTERISTICS V = 12 V, R = 82 kΩ, C = 220 pF, R = 10 kΩ, R
DELAB DELCD
= 10 kΩ, C = 0.1 µF,
REF
DD
T
T
C
= 0.1 µF and no load on the outputs, T = T . T = 0°C to 70°C for UCC3895x, T = −40°C to 85°C for UCC2895x and TA = −55°C to 125°C
VDD
A
J
A
A
for the UCC1895x. (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
UVLO (UNDERVOLTAGE LOCKOUT)
UVLO
UVLO
UVLO
Start-up voltage threshold
10.2
8.2
11
9
11.8
(on)
(off)
(hys)
Minimum operating voltage after
start-up
9.8
3.0
V
Hysteresis
1.0
2.0
SUPPLY
I
I
Start-up current
VDD = 8 V
150
5
250
6
µA
mA
V
START
Operating current
DD
V
V
DD
clamp voltage
IDD = 10 mA
16.5
17.5
18.5
DD_CLAMP
VOLTAGE REFERENCE
T = 25°C
4.94
4.85
10
5.00
5
5.06
5.15
J
10 V < VDD < V
0 mA < IREF < 5 mA,
temperature
,
DD_CLAMP
V
REF
Output voltage
V
I
Short circuit current
REF = 0 V,
T = 25°C
20
mA
SC
J
ERROR AMPLIFIER
Common-mode input voltage range
−0.1
−7
3.6
7
V
V
IO
Offset voltage
mV
µA
I
Input bias current (EAP, EAN)
High-level output voltage
Low-level output voltage
−1
1
BIAS
EAOUT_
VOH
EAP−EAN = 500 mV,
I
= −0.5 mA
= 0.5 mA
4.0
0
4.5
0.2
1.5
4.5
85
5.0
0.4
EAOUT
EAP−EAN = −500 mV, I
EAOUT
V
EAOUT_
VOL
I
Error amplifier output source current
Error amplifier output sink current
Open-loop dc gain
EAP−EAN = 500 mV, EAOUT = 2.5 V
EAP−EAN = −500 mV, EAOUT = 2.5 V
1.0
2.5
75
SOURCE
SINK
mA
I
A
dB
VOL
(1)
GBW
Unity gain bandwidth
5.0
1.5
7.0
2.2
MHz
1 V < EAN < 0 V,
0.5 V < EAOUT < 3.0 V
EAP = 500 mV
(1)
Slew rate
V/µs
No-load comparator turn-off
threshold
0.45
0.50
0.60
0.55
0.69
No-load comparator turn-on
threshold
V
0.55
No-load comparator hysteresis
0.035
0.10 0.165
OSCILLATOR
f
Frequency
T = 25°C
473
500
2.5%
2.10
4.5
527
5%
kHz
OSC
J
(1)
Frequency total variation
Over line, temperature
V
V
V
SYNC input threshold, SYNC
High-level output voltage, SYNC
Low-level output voltage, SYNC
Sync output pulse width
2.05
4.1
2.40
5.0
IH_SYNC
OH_SYNC
OL_SYNC
I
I
= −400 µA,
= 100 µA,
V
V
= 2.6 V
= 0.0 V
V
SYNC
CT
0.0
0.5
1.0
SYNC
CT
LOAD
SYNC
= 3.9 kΩ and 30 pF in parallel
85
135
3.1
ns
V
V
V
Timing resistor voltage
2.9
2.25
0.0
3
RT
Timing capacitor peak voltage
Timing capacitor valley voltage
2.35
0.2
2.55
0.4
V
CT(peak)
CT(valley)
(1)
Ensured by design. Not production tested.
4
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