UC1875/6/7/8
UC2875/6/7/8
UC3875/6/7/8
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, –55°C < T
A
< 125°C for the UC1875/6/7/8, –25°C < T
A
<
85°C for the UC2875/6/7/8 and 0°C < T
A
< 70°C for the UC3875/6/7/8, VC = VIN = 12V, R
FREQSET
= 12kΩ, C
FREQSET
= 330pF,
R
SLOPE
= 12kΩ, C
RAMP
= 200pF, C
DELAYSET A-B
= C
DELAYSET C-D
= 0.01µF, I
DELAYSET A-B
= I
DELAYSET C-D
= –500µA, T
A
= T
J
.
PARAMETER
Error Amplifier
Offset Voltage
Input Bias Current
AVOL
CMRR
PSRR
Output Sink Current
Output Source Current
Output Voltage High
Output Voltage Low
Unity Gain BW
Slew Rate
PWM Comparator
Ramp Offset Voltage
Zero Phase Shift Voltage
PWM Phase Shift (Note1) and (Note 7)
Output Skew (Note 1) and (Note 7)
Ramp to Output Delay, (Note 8)
Oscillator
Initial Accuracy
Voltage Stability
Total Variation
Sync Pin Threshold
Clock Out Peak
Clock Out Low
Clock Out Pulse Width
Maximum Frequency, (Note 7)
Ramp Generator/Slope Compensation
Ramp Current, Minimum
Ramp Current, Maximum
Ramp Valley
Ramp Peak - Clamping Level
Current Limit
Input Bias
Threshold Voltage
Delay to Output, (Note 8)
UC3875/6/7/8
UC1875/6/7/8, UC2875/6/7/8
V
CS
+ = 3V
2.4
2
2.5
85
85
5
2.6
125
150
µA
V
nsec
nsec
R
FREQSET
= 100kΩ
I
SLOPE
= 10µA, V
FREQSET
= VREF
I
SLOPE
= 1mA, V
FREQSET
= VREF
–0.8
–11
–0.95
0
3.8
4.1
–14
µA
mA
V
V
T
J
= 25°C
11V < VIN < 20V
Line, Temperature
T
J
= 25°C
T
J
= 25°C
T
J
= 25°C
R
CLOCKSYNC
= 3.9kΩ
R
FREQSET
= 5kΩ
2
0.80
3.8
4.3
3.3
30
100
0.85
1
0.2
1.15
2
1.20
MHz
%
MHz
V
V
V
nsec
MHz
T
J
= 25°C (Note 3)
(Note 4)
V
E/AOUT
> (Ramp Peak + Ramp Offset)
V
E/AOUT
< Zero Phase Shift Voltage
V
E/AOUT
< 1V
UC3875/6/7/8 (Note 6)
UC1875/6/7/8, UC2875/6/7/8 (Note 6)
0.55
98
0
1.3
0.9
99.5
0.5
5
65
65
102
2
±20
100
125
V
V
%
%
nsec
nsec
nsec
1V < V
E/AOUT
< 4V
1.5V < V
CM
< 5.5V
11V < VIN < 20V
V
E/AOUT
= 1V
V
E/AOUT
= 4V
I
E/AOUT
= –0.5mA
I
E/AOUT
= 1mA
(Note 8)
(Note 8)
4
0
7
6
60
75
85
1
5
0.6
90
95
100
2.5
–1.3
4.7
0.5
11
11
–0.5
5
1
15
3
mV
µA
dB
dB
dB
mA
mA
V
V
MHz
V/µsec
TEST CONDITIONS
MIN
TYP
MAX
UNITS
4
TI [ TEXAS INSTRUMENTS ]
