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UC2845N Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce UC2845N
Description  Current-Mode PWM Controllers
Download  56 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2845N Fiches technique(HTML) 7 Page - Texas Instruments

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Temp Stability =
VREF:max ; F VREF:min ;
TJ:max ; F TJ:min ;
7
UC1842, UC2842, UC3842, UC1843, UC2843, UC3843
UC1844, UC2844, UC3844, UC1845, UC2845, UC3845
www.ti.com
SLUS223D – APRIL 1997 – REVISED AUGUST 2016
Product Folder Links: UC1842 UC2842 UC3842 UC1843 UC2843 UC3843 UC1844 UC2844 UC3844 UC1845
UC2845 UC3845
Submit Documentation Feedback
Copyright © 1997–2016, Texas Instruments Incorporated
Thermal Information (continued)
THERMAL METRIC(1)
UCx84x
UNIT
D (SOIC)
D (SOIC)
P (PDIP)
FK (LCCC)
8 PINS
14 PINS
8 PINS
20 PINS
RθJC(bottom)
Junction-to-case (bottom) thermal resistance
4.1
°C/W
(1)
Adjust VCC above the start threshold before setting at 15 V
(2)
Specified by design. Not production tested.
(3)
Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
VREFmin and VREFmax are the maximum and minimum reference voltages
measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in
temperature.
(4)
OUTPUT switching frequency, fSW, equals the oscillator frequency, fOSC, for the UCx842 and UCx843. OUTPUT switching frequency,
fSW, is one half oscillator frequency, fOSC, for the UCx844 and UCx845.
7.5 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted) –55°C
≤ TA ≤ 125°C for the UC184x; –40°C ≤ TA ≤ 85°C
for the UC284x, 0°C
≤ TA ≤ 70°C for the UC384x, VVCC = 15 V
(1); 0.1 µF capacitor from VCC to GROUND, 0.1 µF capacitor
from VREF to GROUND, RRT = 10 kΩ; CCT = 3.3 nF, TJ = TA.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
REFERENCE SECTION
VVREF
Reference voltage
IVREF = 1 mA, TJ = 25°C
UC184x
and
UC284x
4.95
5
5.05
V
UC384x
4.9
5
5.1
Line regulation
12
≤ VCC ≤ 25 V
6
20
mV
Load regulation
1
≤ IVREF ≤ 20 mA
6
25
mV
Temperature stability
See (2) (3)
0.2
0.4
mV/°C
Total output variation
Line, load, temperature (2)
UC184x
and
UC284x
4.9
5.1
V
UC384x
4.82
5.18
Output noise voltage
10 Hz
≤ fOSC ≤ 10 kHz,
(2) T
J = 25°C
50
μV
Long term stability
TA = 125°C, 1000 Hrs
(2)
5
25
mV
Output short circuit
–30
–100
–180
mA
OSCILLATOR SECTION
fOSC
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%
VRT/CT
Amplitude
Peak-to-peak (2)
1.7
V
ERROR AMPLIFIER SECTION
VVFB
Input voltage
VCOMP = 2.5 V
UC184x
and
UC284x
2.45
2.5
2.55
V
UC384x
2.42
2.5
2.58
IVFB
Input bias current
UC184x
and
UC284x
–1
µA
UC384x
–2
AVOL
2
≤ VCOMP ≤ 4 V
65
90
dB
Unity gain bandwidth
TJ = 25°C
(2)
0.7
1
MHz
PSRR
Power supply rejection ratio
12
≤ VCC ≤ 25 V
60
70
dB
I(snk)
COMP sink current
VVFB = 2.7 V, VCOMP = 1.1 V
2
6
mA
I(src)
COMP source current
VVFB = 2.3 V, VCOMP = 5 V
–0.5
–0.8


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