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UC1845A-SP датащи(PDF) 5 Page - Texas Instruments

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номер детали UC1845A-SP
подробное описание детали  QML Class V, Radiation Hardened Current-Mode PWM Controller
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC1845A-SP датащи(HTML) 5 Page - Texas Instruments

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UC1845A-SP
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SLUSC14 – MAY 2015
8.5 Electrical Characteristics
VCC = 15 V
(1), R
T = 10 kΩ, CT = 3.3 nF, TA = TJ = –55°C to 125°C (unless otherwise noted)
(2)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
REFERENCE
5962-8670408VxA
4.95
5
5.06
5962P8670411Vxx
TJ = 25°C, IO = 1 mA,
4.94
5
5.06
Output voltage
Pre-radiation
V
VCC = 15 V
5962P8670411Vxx
4.85
5.06
Post-radiation
Line regulation
VIN = 12 to 25 V
6
20
mV
Load regulation
IO = 1 to 20 mA
6
25
mV
Temperature stability(3) (4) (5)
0.2
0.4
mV/°C
Total output variation(3)
Over line, load, and temperature
4.9
5.1
V
Output noise variation
10 Hz
≤ ƒ ≤ 10 kHz, TJ = 25°C
50
μV
Long-term stability(5)
1000 hours, TA = 125°C
(3)
5
25
mV
Short-circuit output current
–30
–100
–180
mA
OSCILLATOR
Initial accuracy
TJ = 25°C
(6)
47
52
57
kHz
Voltage stability
VCC = 12 to 25 V
0.2%
1%
Temperature stability
TJ = –55°C to 125°C
(3)
5%
Amplitude
VRT/CT peak to peak
(3)
1.7
V
TJ = 25°C
7.8
8.3
8.8
Discharge current
V pin 4 = 2 V(7)
mA
TJ = Full range
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(8) (9)
2.85
3
3.15
V/V
Maximum input signal
VComp = 5 V
(8)
0.9
1
1.1
V
PSRR
VCC = 12 to 25 V
(8)
70
dB
Input bias current
–2
–10
μA
Delay to output
VISENSE = 0 to 2 V
(3)
150
300
ns
OUTPUT
(1)
Adjust VCC above the start threshold before setting at 15 V.
(2)
See Mechanical, Packaging, and Orderable Information for radiation improved devices.
(3)
Parameters ensured by design and/or characterization, if not production tested.
(4)
Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
Temperature Stability = VREF (max) – VREF (min) / TJ (max) – TJ (min). VREF (max) and VREF (min) are the maximum and minimum
reference voltage measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the
extremes in temperature.
(5)
Parameter applies only for 5962-8670408VxA
(6)
Output frequency is one-half oscillator frequency for UC1845A.
(7)
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.
(8)
Parameter measured at trip point of latch with VFB = 0 V.
(9)
Gain defined as: G =
ΔVComp / ΔVISENSE; VISENSE = 0 to 0.8 V.
Copyright © 2015, Texas Instruments Incorporated
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