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UC2844NG4 Datasheet(PDF) 3 Page - Texas Instruments

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Part No. UC2844NG4
Description  CURRENT MODE PWM CONTROLLER
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC2844NG4 Datasheet(HTML) 3 Page - Texas Instruments

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Temp Stability +
V
REF
(max) * VREF (min)
TJ(max) * TJ (min)
VREF(max) and VREF(min) are the maximum and minimum reference voltages measured over
THERMAL CHARACTERISTICS
DISSIPATION RATINGS
ELECTRICAL CHARACTERISTICS
UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
SLUS223C – APRIL 1997 – REVISED JUNE 2007
over operating free-air temperature range (unless otherwise noted)
PACKAGE
θ
JC
θ
JA
DIL-8
J
28(1)
125-160
N
25
110(2)
SOIC-8
D8
42
84-160(2)
SOIC-14
D14
35
50-120(2)
CFP-14
W
5.49
°C/W
175.4C/W
PLCC-20
Q
34
43-75(2)
(1)
θ
JC data values stated were derived from MIL-STD-1835B.
(2)
Specified
θ
JA (junction to ambient) is for devices mounted to 5 in
2 FR4 PC board with one ounce copper where noted. When resistance
range is given, lower values are for 5 in2. Test PWB was 0.062 in thick and typically used 0.635-mm trace widths for power packages
and 1.3-mm trace widths for non-power packages with 100 x 100-mil probe land area at the end of each trace.
TA≤ 25°C
DERATING FACTOR
TA≤ 70°C
TA≤ 85°CPO
TA≤ 125°C
PACKAGE
POWER RATING
ABOVE TA≤ 25°C
POWER RATING
WER RATING
POWER RATING
W
700 mW
5.5 mW/
°C
452 mW
370 mW
150 mW
Unless otherwise stated, these specifications apply for –55
°C ≤ T
A≤ 125°C for the UC184X; –40°C ≤ TA≤ 85°C for the
UC284X; 0
°C ≤ T
A≤ 70°C for the 384X; VCC = 15 V
(1); R
T = 10 kΩ; CT = 3.3 nF, TA = TJ.
UC1842/3/4/5
UC3842/3/4/5
UC2842/3/4/5
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
REFERENCE SECTION
Output Voltage
TJ = 25°C, IO = 1 mA
4.95
5.00
5.05
4.90
5.00
5.10
V
Line Regulation
12
≤ V
IN≤ 25 V
6
20
6
20
mV
Load Regulation
1
≤ I
0≤ 20 mA
6
25
6
25
Temp. Stability
See (2)(3)
0.2
0.4
0.2
0.4
mV/
°C
Total Output Variation
Line, load, tempature (2)
4.9
5.1
4.82
5.18
V
Output Noise Voltage
10 Hz
≤ f ≤ 10 kHz, T
J = 25°C
(2)
50
50
µV
Long Term Stability
TA = 125°C, 1000 Hrs(2)
5
25
5
25
mV
Output Short Circuit
–30
–100
–180
–30
–100
–180
mA
OSCILLATOR SECTION
Initial Accuracy
TJ = 25°C(4)
47
52
57
47
52
57
kHz
Voltage Stability
12
≤ V
CC≤ 25 V
0.2%
1%
0.2%
1%
Temp. Stability
TMIN≤ TA≤ TMAX(2)
5%
5%
Amplitude
VPIN 4 peak-to-peak (2)
1.7
1.7
V
(1)
Adjust VCC above the start threshold before setting at 15 V.
(2)
These parameters, although specified, are not 100% tested in production.
(3)
Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature.
(4)
Output frequency equals oscillator frequency for the UC1842 and UC1843.
Output frequency is one half oscillator frequency for the UC1844 and UC1845.
3
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