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UC2843A-Q1 Datasheet(PDF) 3 Page - Texas Instruments

Part # UC2843A-Q1
Description  CURRENT-MODE PWM CONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UC2843A-Q1 Datasheet(HTML) 3 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS
UC2843A-Q1
www.ti.com........................................................................................................................................................................................................ SGLS384 – MAY 2008
TA = –40°C to 125°C, VCC = 15 V
(1), R
T = 10 kΩ, CT = 3.3 nF, TA = TJ (unless otherwise stated)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Reference Section
Output voltage
TJ = 25°C, IO = 1 mA
4.95
5.0
5.05
V
Line regulation voltage
VIN = 12 V to 25 V
6
20
mV
Load regulation voltage
IO = 1 mA to 20 mA
6
25
mV
Temperature stability(2)(3)
0.2
0.4
mV/
°C
Total output variation voltage
Line, load, temperature
4.9
5.1
V
Output noise voltage
f = 10 Hz to 10 kHz
TJ = 25°C
50
µV
Long term stability
1000 hours
TA = 125°C
5
25
mV
Output short-circuit current
–30
–100
–180
mA
Oscillator Section
Initial accuracy(4)
TJ = 25°C
47
52
57
kHz
Voltage stability
VCC = 12 V to 25 V
0.2
1
%
Temperature stability
TA = MIN to MAX
5
%
Amplitude peak-to-peak
V pin 7
1.7
V
TJ = 25°C
7.8
8.3
8.8
Discharge current(5)
V pin 7 = 2 V
mA
TJ = Full range
7.5
8.8
Error Amplifier Section
Input voltage
COMP = 2.5 V
2.45
2.5
2.55
V
Input bias current
–0.3
–1
µA
Open loop voltage gain (AVOL)
VO = 2 V to 4 V
65
90
dB
Unity gain bandwidth(3)
TJ = 25°C
0.7
1
MHz
PSRR
VCC = 12 V to 25 V
60
70
dB
Output sink current
FB = 2.7 V, COMP = 1.1 V
2
6
mA
Output source current
FB = 2.3 V, COMP = 5 V
–0.5
–0.8
mA
VOUT high
FB = 2.3 V, RL = 15 k
Ω to GND
5
6
V
VOUT low
FB = 2.7 V, RL = 15 k
Ω to VREF
0.7
1.1
V
Current Sense Section
Gain(6)(7)
2.85
3
3.15
V/V
Maximum input signal(6)
COMP = 5 V
0.9
1
1.1
V
PSRR(6)
VCC = 12 V to 25 V
70
dB
Input bias current
–2
–10
µA
Delay to output(3)
ISENSE = 0 V to 2 V
150
300
ns
(1)
Adjust VCC above the start threshold before setting at 15 V.
(2)
Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
Temperature Stability = (VREF (max) – VREF (min))/(TJ (max) – TJ (min)). VREF (max) and VREF (min) are the maximum and minimum
reference voltage measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the
extremes in temperature.
(3)
Specified by design.
(4)
Output frequency equals oscillator frequency for the UC2843A.
(5)
This parameter is measured with RT = 10 kΩ to VREF. This contributes approximately 300 µA of current to the measurement. The total
current flowing into the RT/RC pin is approximately 300 µA higher than the measured value.
(6)
Parameter measured at trip point of latch with VFB at 0 V.
(7)
Gain is defined by: A =
ΔVCOMP/ΔVSENSE; 0 ≤ VSENSE ≤ 0.8 V.
Copyright © 2008, Texas Instruments Incorporated
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