LT1170 Просмотр технического описания (PDF) - Linear Technology
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LT1170 Datasheet PDF : 20 Pages
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LT1170/LT1171/LT1172
TYPICAL PERFOR A CE CHARACTERISTICS
Idle Supply Current vs
Temperature
11
10 VC = 0.6V
9
8
7
VSUPPLY = 60V
6
VSUPPLY = 3V
5
4
3
2
1
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1170/1/2 G13
Feedback Pin Clamp Voltage
500
450
400
–55°C
350
300
25°C
250
150°C
200
150
100
50
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FEEDBACK CURRENT (mA)
1170/1/2 G14
Switch “Off” Characteristics
1000
900
800
700
600
500 VSUPPLY
= 3V
400
VSUPPLY
= 15V
VSUPPLY
= 40V
VSUPPLY
= 55V
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100
SWITCH VOLTAGE (V)
1170/1/2 G15
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)
1170/1/2 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)
1170/1/2 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)
1170/1/2 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
210
10k
100k
1M
10M
FREQUENCY (Hz)
1170/1/2 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
–4
0 25 50 75 100 125 150
TEMPERATURE (°C)
1170/1/2 G20
6
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