參數(shù)資料
型號(hào): LT1172HVIQ#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 3.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PSSO5
封裝: LEAD FREE, PLASTIC, D2PAK-5
文件頁(yè)數(shù): 22/24頁(yè)
文件大小: 225K
代理商: LT1172HVIQ#TRPBF
LT1170/LT1171/LT1172
7
117012fg
TYPICAL PERFORMANCE CHARACTERISTICS
Idle Supply Current vs Temperature
Feedback Pin Clamp Voltage
Switch “Off” Characteristics
Shutdown Thresholds
Flyback Blanking Time
Isolated Mode Flyback
Reference Voltage
Shutdown Mode Supply Current
Error Amplifier Transconductance
VC Pin Characteristics
VC PIN VOLTAGE (mV)
0
SUPPLY
CURRENT
(μA)
200
180
160
140
120
100
80
60
40
20
0
40
1170/1/2 G10
10 20 30
50 60 70 80 90 100
TJ = 150°C
–55°C ≤ TJ ≤ 125°C
TEMPERATURE (°C)
TRANSCONDUCTANCE
(μmho)
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
1170/1/2 G11
–75
–25
25
50
150
–50
0
75 100 125
gm =
I (VC PIN)
V (FB PIN)
VC PIN VOLTAGE (V)
300
200
100
0
–100
–200
–300
–400
1170/1/2 G12
V
C
PIN
CURRENT
(μA)
0
2.0
0.5
1.0
1.5
2.5
VFB = 1.5V (CURRENT INTO VC PIN)
VFB = 0.8V (CURRENT OUT OF VC PIN)
TJ = 25°C
TEMPERATURE (°C)
IDLE
SUPPLY
CURRENT
(mA)
11
10
9
8
7
6
5
4
3
2
1
1170/1/2 G13
–75
–25
25
50
150
–50
0
75 100 125
VSUPPLY = 60V
VSUPPLY = 3V
VC = 0.6V
FEEDBACK CURRENT (mA)
0
FEEDBACK
VOLTAGE
(mV)
500
450
400
350
300
250
200
150
100
50
0
0.4
1170/1/2 G14
0.1 0.2 0.3
0.5 0.6 0.7 0.8 0.9 1.0
–55°C
25°C
150°C
SWITCH VOLTAGE (V)
0
SWITCH
CURRENT
(μA)
1000
900
800
700
600
500
400
300
200
100
0
40
1170/1/2 G15
10 20 30
50 60 70 80 90 100
VSUPPLY
= 55V
VSUPPLY
= 3V
VSUPPLY
= 15V
VSUPPLY
= 40V
TEMPERATURE (°C)
V
C
PIN
VOLTAGE
(mV)
1170/1/2 G16
400
350
300
250
200
150
100
50
0
–75
–25
25
50
150
–50
0
75 100 125
–400
–350
–300
–250
–200
–150
–100
–50
0
V
C PIN
CURRENT
(μA)
CURRENT (OUT OF VC PIN)
VOLTAGE
VC VOLTAGE IS REDUCED UNTIL
REGULATOR CURRENT DROPS
BELOW 300μA
JUNCTION TEMPERATURE (°C)
–75
TIME
(μs)
–25
25
50
150
1170/1/2 G17
–50
0
75 100 125
2.2
2.0
1.8
1.6
1.4
1.2
1.0
TEMPERATURE (°C)
FLYBACK
VOLTAGE
(V)
1170/1/2 G18
23
22
21
20
19
18
17
16
15
–75
–25
25
50
150
–50
0
75 100 125
RFB = 500Ω
RFB = 1k
RFB = 10k
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