LT1572 Просмотр технического описания (PDF) - Linear Technology
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LT1572 Datasheet PDF : 12 Pages
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LT1572
TYPICAL PERFOR A CE CHARACTERISTICS
Shutdown Thresholds
400
– 400
350
CURRENT (OUT OF VC PIN)
300
– 350
– 300
250
– 250
200
VOLTAGE
150
– 200
– 150
100
–100
VC VOLTAGE IS REDUCED UNTIL
50
REGULATOR CURRENT DROPS
– 50
BELOW 300µA
0
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1572 G16
Flyback Blanking Time
2.2
2.0
1.8
1.6
1.4
1.2
1.0
–75 –50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
1572 G17
Isolated Mode Flyback Reference
Voltage
23
22
21
RFB = 500Ω
20
19
RFB = 1k
18
17
RFB = 10k
16
15
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1572 G18
Transconductance of Error
Amplifier
7000
–30
6000
5000
0
θ
30
4000
3000
gm
60
90
2000
120
1000
150
0
180
–1000
1k
10k
100k
1M
FREQUENCY (Hz)
210
10M
1572 G19
Normal/Flyback Mode Threshold on
Feedback Pin
500
–24
490
–22
480
–20
470
–18
FEEDBACK PIN VOLTAGE
460
(AT THRESHOLD)
–16
450
–14
440
–12
430
FEEDBACK PIN CURRENT
–10
(AT THRESHOLD)
420
–8
410
–6
400
–50 –25
0 25 50 75 100
TEMPERATURE (°C)
–4
125 150
1572 G20
6
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