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UC1844A-SP Datasheet(PDF) 5 Page - Texas Instruments

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No. de pieza UC1844A-SP
Descripción Electrónicos  QML Class V, Current-Mode PWM Controller
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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UC1844A-SP Datasheet(HTML) 5 Page - Texas Instruments

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UC1842A-SP, UC1843A-SP, UC1844A-SP
www.ti.com
SLUS872D – JANUARY 2009 – REVISED 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
Output voltage
TJ = 25°C, IO = 1 mA
4.95
5
5.06
V
Line regulation
VIN = 12 to 25 V
6
20
mV
Load regulation
IO = 1 to 20 mA
6
25
mV
Temperature stability(3) (4)
0.2
0.4
mV/°C
Total output variation(3)
Over line, load, and temperature
4.9
5.1
V
Output noise voltage
10 Hz
≤ ƒ ≤ 10 kHz, TJ = 25°C
50
μV
Long-term stability
1000 hours, TA = 125°C
(3)
5
25
mV
Short-circuit output current
–30
–100
–180
mA
OSCILLATOR
Initial accuracy
TJ = 25°C
(5)
47
52
57
kHz
Voltage stability
VCC = 12 to 25 V
0.2%
1%
Temperature stability
TA = MIN to MAX
(3)
5%
Amplitude peak-to-peak
V pin 4(3)
1.7
V
TJ = 25°C
7.8
8.3
8.8
Discharge current
V pin 4 = 2 V(6)
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(7) (8)
2.85
3
3.15
V/V
Maximum input signal
VComp = 5 V
(7)
0.9
1
1.1
V
PSRR
VCC = 12 to 25 V
(7)
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
13.5
V
(1)
Adjust VCC above the start threshold before setting at 15 V.
(2)
Electrical table applicable to 5962-8670405, 5962-8670406, and 5962-8670407 device types
(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)
Output frequency equals oscillator frequency for the UC1842A and UC1843A. Output frequency is one-half oscillator frequency for
UC1844A.
(6)
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.
(7)
Parameter measured at trip point of latch with VFB = 0 V.
(8)
Gain defined as: G =
ΔVComp / ΔVISENSE; VISENSE = 0 to 0.8 V.
Copyright © 2009–2015, Texas Instruments Incorporated
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