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UC1842A-SP Scheda tecnica(PDF) 7 Page - Texas Instruments

Il numero della parte UC1842A-SP
Spiegazioni elettronici  QML Class V, Current-Mode PWM Controller
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Homepage  http://www.ti.com
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UC1842A-SP Scheda tecnica(HTML) 7 Page - Texas Instruments

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UC1842A-SP, UC1843A-SP, UC1844A-SP
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SLUS872D – JANUARY 2009 – REVISED MAY 2015
8.6 Electrical Characteristics (Radiation-Improved Devices)
VCC = 15 V, RT = 10 kΩ, CT = 3.3 nF, TA = TJ = –55°C to 125°C (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
REFERENCE
Output voltage
TJ = 25°C, IO = 1 mA
4.94
5
5.06
V
Line regulation
VCC = 12 to 25 V
6
20
mV
Load regulation
IL = 1 to 20 mA
6
25
mV
Total output variation
Over line, load, and temperature
4.9
5.1
V
Output noise voltage
10 Hz
≤ ƒ ≤ 10 kHz, TJ = 25°C
50
μV
Short-circuit output current
–30
–100
–180
mA
OSCILLATOR
Initial accuracy
TJ = 25°C
47
52
57
kHz
Voltage stability
VCC = 12 to 25 V
0.2%
1%
Temperature stability
TJ = –55°C to 125°C
5%
Amplitude
VRT/CT peak to peak
1.7
V
TJ = 25°C, VRT/CT = 2 V
7.8
8.3
8.8
Discharge current(2)
mA
VRT/CT = 2 V
7.5
8.8
ERROR AMPLIFIER
Input voltage
VComp = 2.5 V
2.45
2.50
2.55
V
Input bias current
–0.3
–1
μA
Open-loop voltage gain
VO = 2 to 4 V
65
90
dB
Unity-gain bandwidth
TJ = 25°C
(3)
0.7
1
MHz
PSRR
VCC = 12 to 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
High-level output voltage
VFB = 2.3 V, RL = 15 kΩ to ground
5
6
V
Low-level output voltage
VFB = 2.7 V, RL = 15 kΩ to VREF
0.7
1.1
V
CURRENT SENSE
Gain(4) (5)
2.85
3
3.15
V/V
Maximum input signal
VComp = 5 V
(4)
0.9
1
1.1
V
PSRR
VCC = 12 to 25 V
(4)
70
dB
Input bias current
–2
–10
μA
Delay to output
VISENSE = 0 to 2 V
(3)
150
300
ns
OUTPUT
ISINK = 20 mA
0.1
0.4
V
Output low-level voltage
ISINK = 200 mA
1.5
2.2
V
ISOURCE = 20 mA
13
13.5
V
Output high-level voltage
ISOURCE = 200 mA
12
13.0
V
Rise time
CL = 1 nF, TJ = 25°C
(3)
50
150
ns
Fall time
CL = 1 nF, TJ = 25°C
(3)
50
150
ns
UVLO saturation
VCC = 5 V, ISINK = 10 mA
0.7
1.2
V
UNDERVOLTAGE LOCKOUT
Start threshold
7.8
8.4
9
V
Minimum operation voltage after turn-on
7
7.6
8.2
V
(1)
Electrical table applicable to radiation-improved 5962-8670409 device type
(2)
This parameter is measured with RT = 10 kΩ to VREF. This contributes approximately 300 μA of current to the measurement. The total
current flowing into the RT or CT pin will be approximately 300 μA higher than the measured value.
(3)
Parameters ensured by design and/or characterization, if not production tested.
(4)
Parameter measured at trip point of latch with VFB = 0 V.
(5)
Gain defined as: G =
ΔVComp/ΔVISENSE; VISENSE = 0 to 0.8 V.
Copyright © 2009–2015, Texas Instruments Incorporated
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