LT1572 Ver la hoja de datos (PDF) - Linear Technology
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LT1572 Datasheet PDF : 12 Pages
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LT1572
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise noted.
The q denotes the specifications which apply over the full operating
temperature range, 0°C to 100°C for the regulator chip and 0°C to 125°C
for the diode.
Note 5: See graphs for guaranteed forward voltage and reverse leakage
current over temperature. Parameters are 100% tested at 25°C and
guaranteed at other temperatures by design and QA sampling.
Note 1: Measured with VC in hi clamp, VFB = 0.8V. ISW = 1A.
Note 2: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by ILIM = 0.833 (2 – DC).
Note 3: Minimum input voltage for isolated flyback mode is 7V.
Note 6: Package soldered to FR4 board with ≥1oz copper and an internal
or backside plane underneath the package to aid thermal transfer. Diode is
partly thermally coupled to regulator section. See Application Information
section for details on thermal calculations.
Note 4: Because the catch diode has a peak repetitive reverse voltage of
20V, diode breakdown may be the limiting factor on input voltage or
switch voltage in many applications.
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Current Limit vs Duty Cycle
4
3
–55°C
25°C
2
125°C
1
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
1572 G01
Line Regulation
5
4
3
TJ = 150°C
2
1
0 TJ = –55°C
–1
TJ = 25°C
–2
–3
–4
–5
0
10 20 30 40
INPUT VOLTAGE (V)
50 60
1572 G04
Minimum Input Voltage
2.9
SWITCH CURRENT = 1.25A
2.8
2.7
2.6
SWITCH CURRENT = 0A
2.5
2.4
2.3
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1572 G02
Reference Voltage vs Temperature
1.250
1.248
1.246
1.244
1.242
1.240
1.238
1.236
1.234
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1572 G05
Switch Saturation Voltage
1.6
1.4
150°C
1.2
100°C
1.0
0.8
25°C
–55°C
0.6
0.4
0.2
0
0 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
SWITCH CURRENT (A)
1572 G03
Feedback Bias Current vs
Temperature
800
700
600
500
400
300
200
100
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1572 G06
4
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