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UC2845ADG4 Fiches technique(PDF) 7 Page - Texas Instruments

No de pièce UC2845ADG4
Description  Current-Mode PWM Controller
Download  45 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2845ADG4 Fiches technique(HTML) 7 Page - Texas Instruments

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UC1842A, UC1843A, UC1844A, UC1845A
UC2842A, UC2843A, UC2844A, UC2845A
UC3842A, UC3843A, UC3844A, UC3845A
www.ti.com
SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016
Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A
UC3843A UC3844A UC3845A
Submit Documentation Feedback
Copyright © 1994–2016, Texas Instruments Incorporated
Electrical Characteristics (continued)
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
(6)
Parameter measured at trip point of latch with VFB = 0.
(7)
Gain defined as: A = ΔVCOMP / ΔVISENSE; 0 ≤ VISENSE ≤ 0.8 V.
ERROR AMPLIFIER
Input voltage
VCOMP = 2.5 V
UC184xA, UC284xA
2.45
2.5
2.55
V
UC384xA
2.42
2.5
2.58
Input bias current
–0.3
–1
µA
–0.3
–2
AVOL
Open-loop gain
2
≤ VO ≤ 4 V
65
90
dB
Unity gain bandwidth
TJ = 25°C
(2)
0.7
1
MHz
CMRR Common mode rejection ratio
12
≤ VCC ≤ 25 V
60
70
dB
Output sink current
VFB = 2.7 V, VCOMP = 1.1 V
2
6
mA
Output source current
VFB = 2.3 V, VCOMP = 5 V
–0.5
–0.8
mA
VOUT high
VFB = 2.3 V, RL = 15 kΩ to ground
5
6
V
VOUT low
VFB = 2.7 V, RL = 15 kΩ to VREF
0.7
1.1
V
CURRENT SENSE
Gain
See (6)(7)
2.85
3
3.15
V/V
Maximum input signal
VCOMP = 5 V
(6)
0.9
1
1.1
V
PSRR
Power supply rejection ratio
12
≤ VCC 25 V
(6)
70
dB
Input bias current
–2
–10
µA
Delay to output
VISENSE = 0 to 2 V
(2)
150
300
ns
OUTPUT
Output low level
ISINK = 20 mA
0.1
0.4
V
ISINK = 200 mA
15
2.2
Output high level
ISOURCE = 20 mA
13
13.5
V
ISOURCE = 200 mA
12
13.5
Rise time
TJ = 25°C, CL = 1 nF
(2)
50
150
ns
Fall time
TJ = 25°C, CL = 1 nF
(2)
50
150
ns
UVLO saturation
VCC = 5 V, ISINK = 10 mA
0.7
1.2
V
UNDERVOLTAGE LOCKOUT
Start threshold
UC1842A, UC1844A, UC2842A, and UC2844A
15
16
17
V
UC3842A and UC3844A
14.5
16
17.5
UCx843A and UCx845A
7.8
8.4
9
Minimum operation voltage after
turnon
UC1842A, UC1844A, UC2842A, and UC2844A
9
10
11
V
UC3842A and UC3844A
8.5
10
11.5
UCx843A and UCx845A
7
7.6
8.2
PWM
Maximum duty cycle
UCx842A, UCx843A
94%
96%
100%
UCx844A, UCx845A
47%
48%
50%
Minimum duty cycle
0%
TOTAL STANDBY CURRENT
Start-up current
0.3
0.5
mA
Operating supply current
VFB = VISENSE = 0 V
11
17
mA
VCC Zener voltage
ICC = 25 mA
30
34
V


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