UC1525A/27A
UC2525A/27A
UC3525A/27A
ELECTRICAL CHARACTERISTICS:
+V
IN
= 20V, and over operating temperature, unless otherwise specified, T
A
= T
J.
PARAMETER
Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability (Note 5)
Total Output Variation (Note 5)
Shorter Circuit Current
Output Noise Voltage (Note 5)
Long Term Stability (Note 5)
Oscillator Section
(Note 6)
Initial Accuracy (Notes 5 & 6)
Voltage Stability (Notes 5 & 6)
Temperature Stability (Note 5)
Minimum Frequency
Maximum Frequency
Current Mirror
Clock Amplitude (Notes 5 & 6)
Clock Width (Notes 5 & 6)
Sync Threshold
Sync Input Current
Error Amplifier Section
CM
= 5.1V)
(V
Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
Gain-Bandwidth Product
(Note 5)
DC Transconductance
(Notes 5 & 7)
Output Low Level
Output High Level
Common Mode Rejection
Supply Voltage Rejection
V
CM
= 1.5 to 5.2V
V
IN
= 8 to 35V
3.8
60
50
R
L
≥
10MΩ
A
V
= 0dB, T
J
= 25°C
T
J
= 25°C, 30kΩ
≤
R
L
≤
1MΩ
60
1
1.1
75
2
1.5
0.2
5.6
75
60
0.5
3.8
60
50
0.5
1
5
10
1
60
1
1.1
75
2
1.5
0.2
5.6
75
60
0.5
2
1
10
10
1
mV
µA
µA
dB
MHz
mS
V
V
dB
dB
Sync Voltage = 3.5V
T
J
= 25°C
T
J
= 25°C
V
IN
= 8 to 35V
Over Operating Range
R
T
= 200kΩ, C
T
= 0.1µF
R
T
= 2kΩ, C
T
= 470pF
I
RT
= 2mA
400
1.7
3.0
0.3
1.2
2.0
3.5
0.5
2.0
1.0
1.0
2.8
2.5
2.2
±
2
±
0.3
±
3
±
6
±
1
±
6
120
400
1.7
3.0
0.3
1.2
2.0
3.5
0.5
2.0
1.0
1.0
2.8
2.5
2.2
±
2
±
1
±
3
±
6
±
2
±
6
120
%
%
%
Hz
kHz
mA
V
µs
V
mA
T
J
= 25°C
V
IN
= 8 to 35V
I
L
= 0 to 20mA
Over Operating Range
Line, Load, and Temperature
V
REF
= 0, T
J
= 25°C
10Hz
≤
10kHz, T
J
= 25
°
C
T
J
= 125°C
5.00
80
40
20
5.05
5.10
10
20
20
5.15
20
50
50
5.20
100
200
50
4.95
80
40
20
5.00
5.10
10
20
20
5.20
20
50
50
5.25
100
200
50
V
mA
µVrms
mV
V
mV
mV
TEST CONDITIONS
UC1525A/UC2525A
UC1527A/UC2527A
MIN
TYP
MAX
MIN
UC3525A
UC3527A
TYP
MAX
UNITS
Note 5: These parameters, although ensured over the recommended operating conditions, are not 100% tested in production.
Note 6: Tested at f
OSC
= 40kHz (R
T
= 3.6kW, C
T
= 0.01mF, R
D
= 0W). Approximate oscillator frequency is defined by:
1
f
=
C
T
(0.7
R
T
+
3R
D
)
Note 7: DC transconductance (g
M
) relates to DC open-loop voltage gain (A
V
) according to the following equation: A
V
= g
M
R
L
where R
L
is the resistance from pin 9 to ground
.
The minimum g
M
specification is used to calculate minimum A
V
when the
error amplifier output is loaded.
3
TI [ TEXAS INSTRUMENTS ]
