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UC2845D8G4 Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce UC2845D8G4
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

UC2845D8G4 Fiches technique(HTML) 8 Page - Texas Instruments

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UC1842, UC2842, UC3842, UC1843, UC2843, UC3843
UC1844, UC2844, UC3844, UC1845, UC2845, UC3845
SLUS223D – APRIL 1997 – REVISED AUGUST 2016
www.ti.com
Product Folder Links: UC1842 UC2842 UC3842 UC1843 UC2843 UC3843 UC1844 UC2844 UC3844 UC1845
UC2845 UC3845
Submit Documentation Feedback
Copyright © 1997–2016, Texas Instruments Incorporated
Electrical Characteristics (continued)
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
(5)
Parameter measured at trip point of latch with VFB = 0 V.
(6)
Gain defined as: A = ΔVCOMP/ΔVISENSE, 0 V ≤ VISENSE ≤ 0.8 V.
VCOMP
High
High-level output voltage
VVFB = 2.3 V, RL = 15-kΩ COMP to GROUND
5
6
V
VCOMP
Low
Low-level output voltage
VVFB = 2.7 V, RL = 15-kΩ COMP to VREF
0.7
1.1
CURRENT SENSE SECTION
ACS
Gain
See (5) (6)
2.85
3
3.15
V/V
VISENSE
Maximum input signal
VCOMP = 5 V
(5)
0.9
1
1.1
V
PSRR
Power supply rejection ratio
12 V
≤ VVCC ≤ 25 V
(2) (5)
70
dB
IISENSE
Input bias current
–2
–10
µA
tDLY
Delay to output
VISENSE stepped from 0 V to 2 V
(2)
150
300
ns
OUTPUT SECTION
VOUT Low
Low-level OUTPUT voltage
ISINK = 20 mA
0.1
0.4
V
ISINK = 200 mA
1.5
2.2
VOUT High High-level OUTPUT voltage
ISOURCE = 20 mA
13
13.5
V
ISOURCE = 200 mA
12
13.5
tRISE
Rise time (2)
COUTPUT = 1 nF, TJ = 25°C
50
150
ns
tFALL
Fall time (2)
COUTPUT = 1 nF, TJ = 25°C,
50
150
ns
UNDERVOLTAGE LOCKOUT (UVLO)
VCCON
Enable threshold
UCx842/4
UC184x
and
UC284x
15
16
17
V
UCx843/5
UC384x
14.5
16
17.5
UCx843/5
7.8
8.4
9
VCCOFF
UVLO off threshold
UCx842/4
UC184x
and
UC284x
9
10
11
V
UCx843/5
UC384x
8.5
10
11.5
UCx843/5
7
7.6
8.2
PWM
DMAX
Maximum duty cycle
UCx842/3
95%
97%
100%
UCx844/5
UC184x
and
UC284x
46%
48%
50%
UC384x
47%
48%
50%
DMIN
Minimum duty cycle
0%
TOTAL STANDBY CURRENT
IVCC
Start-up current
0.5
1
mA
IVCC
Operating supply current
VVFB = VISENSE= 0 V
11
17
VCC Zener voltage
IVCC = 25 mA
30
34
V


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