UCC1895
UCC2895
UCC3895
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, VDD=12V, RT=82kW, CT=220pF, RDELAB=10kW,
RDELCD=10kW, CREF=0.1mF, CVDD=1.0mF, no load at outputs. TA = TJ. TA = 0°C to 70°C for UCC3895x, –40°C to +85°C for
UCC2895x, and –55°C to +125°C for UCC1895x.
PARAMETER
Voltage Reference Section
Output Voltage
TEST CONDITIONS
MIN
TYP
MAX UNITS
TJ = 25°C
4.94
4.85
5.00
5
5.06
5.15
V
V
10V < VDD < 17.5V, 0mA < IREF < 5mA,
Temperature
Short Circuit Current
Error Amplifier Section
Common Mode Input Voltage Range
Offset Voltage
REF = 0V, TJ = 25°C
10
20
mA
–0.1
–7
3.6
7
V
mV
mA
Input Bias Current (EAP, EAN)
EAOUT VOH
–1
1
EAP–EAN = 500mV, IEAOUT= –0.5mA
EAP–EAN = –500mV, IEAOUT= 0.5mA
EAP–EAN = 500mV, EAOUT= 2.5V
4.0
0
4.5
0.2
1.5
4.5
85
5.0
0.4
V
EAOUT VOL
V
EAOUT Source Current
EAOUT Sink Current
Open Loop DC Gain
Unity Gain Bandwidth
Slew Rate
1.0
2.5
75
mA
mA
dB
EAP–EAN = –500mV, EAOUT= 2.5V, (Note 4)
(Note 3)
5.0
1.5
7.0
2.2
MHz
V/ms
EAN from 1V to 0V, EAP = 500mV,
EAOUT from 0.5V to 3.0V, (Note 3)
No Load Comparator Turn-Off Threshold
No Load Comparator Turn-On Threshold
No Load Comparator Hysteresis
Oscillator Section
0.45
0.55
0.50
0.60
0.55
0.69
V
V
V
0.035 0.100 0.165
Frequency
TJ = 25°C
473
500
2.5
2.10
1.90
4.5
0.5
85
527
5
kHz
%
V
Total Variation
Line, Temperature (Note 3)
SYNC VIH
2.05
1.85
4.1
2.25
1.95
5.0
1.0
135
3.1
2.50
0.4
0.6
SYNC VIL
V
SYNC VOH
ISYNC = –400mA, CT = 2.6V
V
SYNC VOL
ISYNC = 100mA, CT = 0V
0.0
V
SYNC Output Pulse Width
RT Voltage
SYNC Load = 3.9kW and 30pF in parallel
ns
V
2.9
2.25
0.0
3
CT Peak Voltage
2.35
0.2
0.2
V
CT Valley Voltage
UCC2895, UCC3895
UCC1895
V
CT Valley Voltage
0.0
V
PWM Comparator Section
EAOUT to RAMP Input Offset Voltage
RAMP = 0V, DELAB = DELCD = REF
RAMP = 0V, EAOUT = 650mV (Note 1)
0.72
0.00
0.85
0.85
1.05
1.40
V
Minimum Phase Shift
%
(OUTA to OUTC, OUTB to OUTD)
RAMP to OUTC/OUTD Delay
RAMP from 0V to 2.5V, EAOUT = 1.2V,
DELAB = DELCD = REF (Note 2)
70
19
120
5
ns
RAMP Bias Current
RAMP Sink Current
Current Sense Section
CS Bias Current
RAMP < 5V, CT < 2.2V
RAMP = 5V, CT < 2.6V
–5
12
mA
mA
0 < CS , 2.5V, 0 < ADS < 2.5V
–4.5
1.90
2.4
20
2.10
2.6
mA
V
Peak Current Threshold
Overcurrent Threshold
CS to Output Delay
2.00
2.5
75
V
CS from 0 to 2.3V, DELAB = DELCD = REF
3
110
ns
TI [ TEXAS INSTRUMENTS ]
