lt3845a Linear Technology Corporation, lt3845a Datasheet - Page 6

• Manufacturer Part Number: lt3845a
• Description: Lt3845a - High Voltage Synchronous Current Mode Step-down Controller With Adjustable Operating Frequency
• Manufacturer: Linear Technology Corporation

LT3845A
TYPICAL PERFORMANCE CHARACTERISTICS
6
–200
–400
800
600
400
200
0
0 0.5
I
(SENSE
1.0
+
+ SENSE
1.5
V
106
104
102
100
100
2.0
SENSE(CM)
94
98
96
90
80
70
60
50
40
30
20
10
0
–50
–
0
2.5
Current Sense Threshold
vs Duty Cycle
)
Maximum Current Sense
Threshold vs Temperature
vs V
10 20 30
–25
3.0
(V)
SENSE(CM)
3.5
0
TEMPERATURE (°C)
4.0
T
DUTY CYCLE (%)
A
= 25°C
40
3845A G10
25
4.5
50
5.0
50
60 70 80
75
302
300
298
294
308
306
304
296
292
290
100
–50
3845A G16
3845A G13
90 100
Operating Frequency
vs Temperature
125
–25
0
TEMPERATURE (°C)
25
50
75
4.54
4.52
4.50
4.48
4.46
4.44
4.42
4.40
3.86
3.84
3.82
3.80
3.78
3.76
100
3845A G11
–50
–50
V
vs Temperature
V
vs Temperature
IN
IN
125
–25
–25
UVLO Threshold (Rising)
UVLO Threshold (Falling)
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
1.234
1.233
1.232
1.231
1.230
1.229
1.228
1.227
25
25
–50
Error Amp Reference
vs Temperature
50
50
–25
75
75
0
TEMPERATURE (°C)
100
100
3845A G14
25
3845A G15
125
125
50
75
100
3845A G12
3845afa
125