UC3843D8 UNITRODE, UC3843D8 Datasheet - Page 3

• Manufacturer Part Number: UC3843D8
• Description: PWM CONTROLLER, SMD, 3843, SOIC8
• Manufacturer: UNITRODE

Specifications of UC3843D8

• Input Voltage: 15V
• Output Voltage: 5V
• Output Current: 200mA
• Frequency: 500kHz
• Power Dissipation Pd: 650mW
• Supply Voltage Range: 12V To 25V
• Digital Ic Case Style: SOIC
• No. Of Pins: 8
• Operating: RoHS Compliant

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