LT1619 Linear Technology, LT1619 Datasheet - Page 4

• Manufacturer Part Number: LT1619
• Description: Low Voltage Current Mode PWM Controller
• Manufacturer: Linear Technology

LT1619
TYPICAL PERFOR A CE CHARACTERISTICS
4
95
94
93
92
91
90
14
12
10
45
40
35
30
25
20
15
10
8
6
4
0
2
5
–40
–40 –20
Shutdown Supply Current
vs Input Voltage
0
Maximum Duty Ratio
vs Temperature
Burst Mode Operation Current
Limit Threshold vs Temperature
V
V
DUTY CYCLE = 0
IN
IN
–20
2
= 2.5V
= 2.5V
4
T
A
= 25 C
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
6
INPUT VOLTAGE (V)
T
A
8
20
20
= –40 C
10
40
40
12
T
A
= 85 C
60
14
60
W
16
80
80
1619 G10
1619 G07
18
1619 G04
U
100
100
20
–115
–117
–119
–121
–123
–125
–127
–129
–131
–133
–135
180
170
150
200
190
160
140
–2
–4
8
6
4
2
0
–40
–40
0
Idle Mode Supply Current
vs Temperature
Deviation from Nominal
Frequency vs Input Voltage
SENSE Pin Input Bias Current
vs Temperature
V
T
NOMINAL FREQUENCY = 300kHZ
V
IN
A
SENSE
= 25 C
–20
2
–20
= 2.5V
= 0V
4
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
6
INPUT VOLTAGE (V)
20
8
20
40
10
40
12
60
14
60
80
16
80
100
18
1619 G11
1619 G05
1619 G08
100
120
20
–100
–105
–110
–115
–120
–125
–130
– 90
– 95
–10
– 2
– 4
– 6
– 8
58
57
56
55
54
53
52
51
50
10
8
6
4
2
0
–40
– 40
–10
Frequency Deviation from
Nominal vs Temperature
Current Limit Threshold
vs Temperature
SENSE Pin Input Bias Current
vs Sense Voltage
V
T
V
NOMINAL FREQUENCY = 300kHz
IN
A
IN
– 20
= 25 C
– 20
= 2.5V
= 2.5V
0
10
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
V
SENSE
20
20
20
(mV)
40
30
40
60
60
40
80
50
80
1619 G12
1619 G09
1619 G06
1619fa
100
100
60