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UC2844N Datasheet(PDF) 4 Page - Texas Instruments

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Part No. UC2844N
Description  CURRENT MODE PWM CONTROLLER
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC2844N Datasheet(HTML) 4 Page - Texas Instruments

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(7)
Gain defined as:
A + D
VPIN 1
DVPIN 3
, 0 v VPIN 3 v 0.8 V
UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
SLUS223C – APRIL 1997 – REVISED JUNE 2007
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise stated, these specifications apply for –55
°C ≤ T
A≤ 125°C for the UC184X; –40°C ≤ TA≤ 85°C for the
UC284X; 0
°C ≤ T
A≤ 70°C for the 384X; VCC = 15 V; RT = 10 kΩ; CT = 3.3 nF, TA = TJ.
UC1842/3/4/5
UC3842/3/4/5
UC2842/3/4/5
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
ERROR AMP SECTION
Input Voltage
VPIN 1 = 2.5 V
2.45
2.50
2.55
2.42
2.50
2.58
V
Input Bias Current
–0.3
–1
–0.3
–2
µA
AVOL
2
≤ V
O≤ 4 V
65
90
65
90
dB
Unity Gain Bandwidth
TJ = 25°C (5)
0.7
1
0.7
1
MHz
PSRR
12
≤ V
CC≤ 25 V
60
70
60
70
dB
Output Sink Current
VPIN 2 = 2.7 V, VPIN 1 = 1.1 V
2
6
2
6
mA
Output Source Current
VPIN 2 = 2.3 V, VPIN 1 = 5 V
–0.5
–0.8
–0.5
–0.8
VOUT High
VPIN 2 = 2.3 V, RL = 15 kΩ to ground
5
6
5
6
V
VOUT Low
VPIN 2 = 2.7 V, RL = 15 kΩ to Pin 8
0.7
1.1
0.7
1.1
CURRENT SENSE SECTION
Gain
See (6)(7)
2.85
3
3.15
2.85
3
3.15
V/V
Maximum Input Signal
VPIN 1 = 5 V (6)
0.9
1
1.1
0.9
1
1.1
V
PSRR
12
≤ V
CC≤ 25 V
(5) (6)
70
70
dB
Input Bias Current
–2
–10
–2
–10
µA
Delay to Output
VPIN 3 = 0 V to 2 V (5)
150
300
150
300
ns
OUTPUT SECTION
ISINK = 20 mA
0.1
0.4
0.1
0.4
Output Low Level
ISINK = 200 mA
1.5
2.2
1.5
2.2
V
ISOURCE = 20 mA
13
13.5
13
13.5
Output High Level
ISOURCE = 200 mA
12
13.5
12
13.5
Rise Time
TJ = 25°C, CL = 1 nF (5)
50
150
50
150
ns
Fall Time
TJ = 25°C, CL = 1nF(5)
50
150
50
150
UNDER-VOLTAGE LOCKOUT SECTION
X842/4
15
16
17
14.5
16
17.5
Start Threshold
X843/5
7.8
8.4
9.0
7.8
8.4
9.0
V
X842/4
9
10
11
8.5
10
11.5
Min. Operating Voltage After
Turn On
X843/5
7.0
7.6
8.2
7.0
7.6
8.2
PWM SECTION
X842/3
95%
97%
100%
95%
97%
100%
Maximum Duty Cycle
X844/5
46%
48%
50%
47%
48%
50%
Minimum Duty Cycle
0%
0%
TOTAL STANDBY CURRENT
Start-Up Current
0.5
1
0.5
1
mA
Operating Supply Current
VPIN 2 = VPIN 3 = 0 V
11
17
11
17
VCC Zener Voltager
ICC = 25 mA
30
34
30
34
V
(5)
These parameters, although specified, are not 100% tested in production.
(6)
Parameter measured at trip point of latch with VPIN 2 = 0.
4
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