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UC2842A Datasheet(PDF) 3 Page - Texas Instruments

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Part No. UC2842A
Description  Current Mode PWM Controller
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC2842A Datasheet(HTML) 3 Page - Texas Instruments

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PARAMETER
TEST CONDITIONS
UC184xA\UC284xA
UC384xA
UNITS
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
Error Amp Section
Input Voltage
VPIN 1 = 2.5V
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
≤ VO ≤ 4V
65
90
65
90
dB
Unity Gain Bandwidth
TJ = 25°C (Note 2)
0.7
1
0.7
1
MHz
PSRR
12
≤ VCC ≤ 25V
6070
6070
dB
Output Sink Current
VPIN 2 = 2.7V, VPIN 1 = 1.1V
2
6
2
6
mA
Output Source Current
VPIN 2 = 2.3V, VPIN 1 = 5V
-0.5
-0.8
-0.5
-0.8
mA
VOUT High
VPIN 2 = 2.3V, RL = 15k to ground
5
6
5
6
V
VOUT Low
VPIN 2 = 2.7V, RL = 15k to Pin 8
0.7
1.1
0.7
1.1
V
Current Sense Section
Gain
(Note 3, Note 4)
2.85
3
3.15
2.85
3
3.15
V/V
Maximum Input Signal
VPIN 1 = 5V (Note 3)
0.9
1
1.1
0.9
1
1.1
V
PSRR
12
≤ VCC ≤ 25V (Note 3)
70
70
dB
Input Bias Current
-2
-10
-2
-10
µA
Delay to Output
VPIN 3 = 0 to 2V (Note 2)
150
300
150
300
ns
Output Section
Output Low Level
ISINK = 20mA
0.1
0.4
0.1
0.4
V
ISINK = 200mA
15
2.2
15
2.2
V
Output High Level
ISOURCE = 20mA
13
13.5
13
13.5
V
ISOURCE = 200mA
12
13.5
12
13.5
V
Rise Time
TJ = 25°C, CL = 1nF (Note 2)
50
150
50
150
ns
Fall Time
TJ = 25°C, CL = 1nF (Note 2)
50
150
50
150
ns
UVLO Saturation
VCC = 5V, ISINK = 10mA
0.7
1.2
0.7
1.2
V
Under-Voltage Lockout Section
Start Threshold
x842A/4A
15
16
17
14.5
16
17.5
V
x843A/5A
7.8
8.4
9.0
7.8
8.4
9.0
V
Min. Operation Voltage After
x842A/4A
9
10
11
8.5
10
11.5
V
TurnOn
x843A/5A
7.0
7.6
8.2
7.0
7.6
8.2
V
PWM Section
Maximum Duty Cycle
x842A/3A
94
96
100
94
96
100
%
x844A/5A
47
48
50
47
48
50
%
Minimum Duty Cycle
0
0
%
Total Standby Current
Start-Up Current
0.3
0.5
0.3
0.5
mA
Operating Supply Current
VPIN 2 = VPIN 3 = 0V
11
17
11
17
mA
VCC Zener Voltage
ICC = 25mA
30
34
30
34
V
UC1842A/3A/4A/5A
UC2842A/3A/4A/5A
UC3842A/3A/4A/5A
Note 2: These parameters, although guaranteed, are not 100%
tested in production.
Note 3: Parameter measured at trip point of latch with VPIN2 = 0.
Note 4: Gain defined as: A
=
∆VPIN 1
∆VPIN 3
; 0
≤ VPIN 3 ≤ 0.8V.
Note 5: Adjust VCC above the start threshold before setting at
15V.
Note 6: Output frequency equals oscillator frequency for the
UC1842A and UC1843A. Output frequency is one half
oscillator frequency for the UC1844A and UC1845A.
Note 7: "Temperature stability, sometimes referred to as average
temperature coefficient, is described by the equation:
Temp Stability
=
VREF
(max)
VREF (min)
TJ
(max) − TJ
(min)
.
VREF (max) and VREF (min) are the maximum & mini-
mum reference voltage measured over the appropriate
temperature range. Note that the extremes in voltage
do not necessarily occur at the extremes in tempera-
ture."
Note 8: This parameter is measured with RT = 10k
Ω to VREF.
This contributes approximately 300
µA of current to the
measurement. The total current flowing into the RT/CT
pin will be approximately 300
µA higher than the meas-
ured value.
ELECTRICAL CHARACTERISTICS (cont.) Unless otherwise stated, these specifications apply for -55
°C ≤ TA ≤ 125°C for
the UC184xA; -40
°C ≤ TA ≤ 85°C for the UC284xA; 0 ≤ TA ≤ 70°C for the UC384xA; VCC = 15V (Note 5); RT = 10k; CT = 3.3nF; TA = TJ;
Pin numbers refer to DIL-8.
3


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