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
UVLO (UNDERVOLTAGE LOCKOUT)
UVLO(on)
UVLO(off)
UVLO(hys)
SUPPLY
ISTART
IDD
Start-up voltage threshold
Minimum operating voltage after
start-up
Hysteresis
Start-up current
Operating current
IDD = 10 mA
TJ = 25°C
10 V < VDD < VDD_CLAMP,
0 mA < IREF < 5 mA,
temperature
REF = 0 V,
TJ = 25°C
16.5
4.94
4.85
10
VDD = 8 V
10.2
8.2
1.0
11
9
2.0
150
5
17.5
5.00
5
20
11.8
9.8
3.0
250
6
18.5
5.06
5.15
V
µA
mA
V
V
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VDD_CLAMP VDD clamp voltage
VOLTAGE REFERENCE
VREF
Output voltage
ISC
Short circuit current
mA
ERROR AMPLIFIER
Common-mode input voltage range
VIO
IBIAS
EAOUT_VOH
EAOUT_VOL
ISOURCE
ISINK
AVOL
GBW
Offset voltage
Input bias current (EAP, EAN)
High-level output voltage
Low-level output voltage
Error amplifier output source current
Error amplifier output sink current
Open-loop dc gain
Unity gain bandwidth(1)
Slew rate(1)
No-load comparator turn-off
threshold
No-load comparator turn-on
threshold
No-load comparator hysteresis
OSCILLATOR
fOSC
VIH_SYNC
VOH_SYNC
VOL_SYNC
VRT
VCT(peak)
Frequency
Frequency total variation(1)
SYNC input threshold, SYNC
High-level output voltage, SYNC
Low-level output voltage, SYNC
Sync output pulse width
Timing resistor voltage
Timing capacitor peak voltage
ISYNC = −400
µA,
ISYNC = 100
µA,
VCT = 2.6 V
VCT = 0.0 V
TJ = 25°C
Over line, temperature
473
2.05
4.1
0.0
2.9
2.25
0.0
500
2.5%
2.10
4.5
0.5
85
3
2.35
0.2
527
5%
2.40
5.0
1.0
135
3.1
2.55
0.4
V
ns
V
kHz
1 V < EAN < 0 V,
EAP = 500 mV
0.5 V < EAOUT < 3.0 V
EAP−EAN = 500 mV,
IEAOUT = −0.5 mA
EAOUT = 2.5 V
−0.1
−7
−1
4.0
0
1.0
2.5
75
5.0
1.5
0.45
0.55
0.035
4.5
0.2
1.5
4.5
85
7.0
2.2
0.50
0.60
0.10
0.55
0.69
0.165
V
mA
dB
MHz
V/µs
3.6
7
1
5.0
0.4
V
V
mV
µA
EAP−EAN = −500 mV, IEAOUT = 0.5 mA
EAP−EAN = 500 mV,
EAP−EAN = −500 mV, EAOUT = 2.5 V
LOADSYNC = 3.9 kΩ and 30 pF in parallel
VCT(valley)
Timing capacitor valley voltage
(1)
Ensured by design. Not production tested.
4
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