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UC3842 Datasheet(PDF) 3 Page - Texas Instruments

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Part # UC3842
Description  Current Mode PWM Controller
Download  8 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UC3842 Datasheet(HTML) 3 Page - Texas Instruments

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PARAMETER
TEST CONDITIONS
UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
Reference Section
Output Voltage
TJ = 25°C, IO = 1mA
4.95
5.00
5.05
4.90
5.00
5.10
V
Line Regulation
12
≤ VIN ≤ 25V
6
20
6
20
mV
Load Regulation
1
≤ I0 ≤ 20mA
6
25
6
25
mV
Temp. Stability
(Note 2) (Note 7)
0.2
0.4
0.2
0.4
mV/°C
Total Output Variation
Line, Load, Temp. (Note 2)
4.9
5.1
4.82
5.18
V
Output Noise Voltage
10Hz
≤ f ≤ 10kHz, TJ = 25°C (Note2)
50
50
µV
Long Term Stability
TA = 125°C, 1000Hrs. (Note 2)
5
25
5
25
mV
Output Short Circuit
-30
-100
-180
-30
-100
-180
mA
Oscillator Section
Initial Accuracy
TJ = 25°C (Note 6)
47
52
57
47
52
57
kHz
Voltage Stability
12
≤ VCC ≤ 25V
0.2
1
0.2
1
%
Temp. Stability
TMIN
≤ TA ≤ TMAX (Note 2)
5
5
%
Amplitude
VPIN 4 peak to peak (Note 2)
1.7
1.7
V
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
(Note 2) TJ = 25°C
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
(Notes 3 and 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) (Note 2)
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
UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for -55°C ≤ TA ≤ 125°C for the
UC184X; -40°C
≤ TA ≤ 85°C for the UC284X; 0°C ≤ TA ≤ 70°C for the 384X; VCC =
15V (Note 5); RT = 10k; CT =3.3nF, TA=TJ.
Note 2: These parameters, although guaranteed, are not 100% tested in production.
Note 3: Parameter measured at trip point of latch with VPIN 2 = 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 UC1842 and UC1843.
Output frequency is one half oscillator frequency for the UC1844 and UC1845.
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 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.
3


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