Datasheet

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ELECTRICAL CHARACTERISTICS
UC1824
UC2824
UC3824
SLUS326A – MARCH 1997 – REVISED JULY 2007
Unless otherwise stated, these specifications apply for, R
T
= 3.65k, C
T
= 1 nF, V
CC
= 15 V, –55 ° C < T
A
< 125 ° C for the
UC1824, –40 ° C < T
A
< 85 ° C for the UC2824, and 0 ° C < T
A
< 70 ° C for the UC3824, T
A
= T
J
.
UC1824
UC3824
UC2824
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
Reference Section
Output voltage T
J
= 25 ° C, I
O
= 1 mA 5.05 5.10 5.15 5 5.10 5.20 V
Line regulation 10 V < V
CC
< 30 V 2 20 2 20
mV mV
Load regulation 1 mA < I
O
< 10 mA 5 20 5 20
Temperature stability
(1)
T
MIN
< T
A
< T
MAX
0.2 0.4 0.2 0.4 mV/ ° C
Total output variation
(1)
Line, Load, Temperature 5 5.20 4.95 5.25 V
Output noise voltage
(1)
10 Hz < f < 10 kHz 50 50 μ V
long term stability
(1)
T
J
= 125 ° C, 1000 hrs. 5 25 5 25 mV
Short circuit current V
REF
= 0 V –15 –50 –100 –15 –50 –100 mA
Oscillator Section
Initial accuracy
(1)
T
J
= 25 ° C 360 400 440 360 400 440 kHz
Voltage stability
(1)
10 V < V
CC
< 30 V 0.2% 2% 0.2% 2%
Temperature stability
(1)
T
MIN
< T
A
< T
MAX
5% 5%
Total variation
(1)
Line, Temperature 340 460 340 460 kHz
Clock out high 3.9 4.5 3.9 4.5
Clock out low 2.3 2.9 2.3 2.9
Ramp peak
(1)
2.6 2.8 3 2.6 2.8 3 V
Ramp valley
(1)
0.7 1 1.25 0.7 1 1.25
Ramp valley to peak
(1)
1.6 1.8 2 1.6 1.8 2
Error Amplifier Section
Input offset voltage 10 15 mV
Input bias current 0.6 3 0.6 3 μ A
Input offset current 0.1 1 0.1 1 μ A
Open loop gain 1 V < V
O
< 4 V 60 95 60 95
CMRR 1.5 V < V
CM
< 5.5 V 75 95 75 95 dB
PSRR 10 V < V
CC
< 30 V 85 110 85 110
Output sink current V
PIN 3
= 1 V 1 2.5 1 2.5
mA
Output source current V
PIN 3
= 4 V –0.5 –1.3 –0.5 –1.3
Output high voltage I
PIN 3
= –0.5 mA 4 4.7 5 4 4.7 5
V
Output low voltage I
PIN 3
= 1 mA 0 0.5 1 0 0.5 1
Unity gain bandwidth
(1)
3 5.5 3 5.5 MHz
Slew rate
(1)
6 12 6 12 V/ μ s
PWM Comparator Section
Pin 7 bias current V
PIN 7
= 0 V –1 –5 –1 –5 μ A
Duty cycle range 0 80 0 85 %
Pin 3 zero dc threshold V
PIN 7
= 0 V 1.1 1.25 1.1 1.25 V
Delay to output
(1)
50 80 50 80 ns
Soft-Start Section
Charge current V
PIN 8
= 0.5 V 3 9 20 3 9 20 μ A
Discharge current V
PIN 8
= 1 V 1 1 mA
Current Limit/Shutdown Section
Pin 9 bias current 0 < V
PIN 9
< 4 V 15 10 μ A
(1) This parameter not 100% tested in production but guaranteed by design.
4
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