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UC2845AD8TR Fiches technique(PDF) 6 Page - Texas Instruments

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No de pièce UC2845AD8TR
Description  Current-Mode PWM Controller
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2845AD8TR Fiches technique(HTML) 6 Page - Texas Instruments

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UC1842A, UC1843A, UC1844A, UC1845A
UC2842A, UC2843A, UC2844A, UC2845A
UC3842A, UC3843A, UC3844A, UC3845A
SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016
www.ti.com
Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A
UC3843A UC3844A UC3845A
Submit Documentation Feedback
Copyright © 1994–2016, Texas Instruments Incorporated
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.4 Thermal Information
THERMAL METRIC(1)
UC184xA
UC2843A
UC284xA, UC384xA
UNIT
JG (CDIP)
FK (LCCC)
FN (PLCC)
P (PDIP)
D (SOIC)
D (SOIC)
DW (SOIC)
8 PINS
20 PINS
20 PINS
8 PINS
8 PINS
14 PINS
16 PINS
RθJA
Junction-to-ambient thermal
resistance
56.7
53.4
104.3
77.9
73.6
°C/W
RθJC(top)
Junction-to-case (top)
thermal resistance
64
36.2
34.6
46.4
46.8
35.8
35
°C/W
RθJB
Junction-to-board thermal
resistance
92.5
35.4
21.8
30.7
45.3
32.5
38.4
°C/W
ψJT
Junction-to-top
characterization parameter
10.4
16.8
6
6.6
9.7
°C/W
ψJB
Junction-to-board
characterization parameter
21.5
30.6
44.6
32.2
37.8
°C/W
RθJC(bot)
Junction-to-case (bottom)
thermal resistance
15.1
4.1
°C/W
(1)
Adjust VCC above the start threshold before setting at 15 V.
(2)
Ensured by design, but not 100% production tested.
(3)
Temperature stability, sometimes referred to as average temperature coefficient, is described by: 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.
(4)
Output frequency equals oscillator frequency for the UC1842A and UC1843A. Output frequency is one half oscillator frequency for the
UC1844A and UC1845A.
(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/CT pin is approximately 300 µA higher than the measured value.
7.5 Electrical Characteristics
Unless otherwise stated, these specifications apply for TA = –55°C to 125°C (UC184xA), TA = –40°C to 125°C (UC284xAQ),
TA = –40°C to 85°C (UC284xA), TA = 0°C to 70°C (UC384xA); TA = TJ; VCC = 15 V
(1); R
T = 10 kΩ; CT = 3.3 nF.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
REFERENCE
Output voltage
TJ = 25°C, IO = 1 mA
UC184xA, UC284xA
4.95
5
5.05
V
UC384xA
4.9
5
5.1
Line regulation
12
≤ VIN ≤ 25 V
6
20
mV
Load regulation
1
≤ IO ≤ 20 mA
6
25
mV
Temperature stability
See (2)(3)
0.2
0.4
mV/°C
Total output variation
Line, Load, Temperature
UC184xA, UC284xA
4.9
5.1
V
UC384xA
4.82
5.18
Output noise voltage
10 Hz
≤ f ≤ 10 kHz; TJ = 25°C
(2)
50
µV
Long-term stability
TA = 125°C, 1000 hrs
(2)
5
25
mV
Output short circuit
–30
–100
–180
mA
OSCILLATOR
Initial accuracy
TJ = 25°C
(4)
47
52
57
kHz
Voltage stability
12
≤ VCC ≤ 25 V
0.2%
1%
Temperature stability
TMIN ≤ TA ≤ TMAX
(2)
5%
Amplitude
VRT/CT peak to peak
(2)
1.7
V
Discharge current
TJ = 25°C, VRT/CT = 2 V
(5)
7.8
8.3
8.8
mA
VRT/CT = 2 V
(5)
UC184xA, UC284xA
7.5
8.8
UC384xA
7.6
8.8


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