LTC6992-4_15 Datasheet, PDF (8/34 Pages) Linear Technology – Voltage-Controlled Pulse Width Modulator

LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
Typical Performance Characteristics V⁺ = 3.3V, R_SET = 200k, and T_A = 25°C, unless
otherwise noted.
N_DIV > 1 Duty Cycle Error
vs Temperature
5
4
GUARANTEED MAX
3
V_MOD/V_SET = 0.5 (50%)
DIVCODE = 4
2 ^{3 PARTS}
1
0
–1
–2
–3
–4
GUARANTEED MIN
–5
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
6992 G22
N_DIV > 1 Duty Cycle Error
vs Temperature
5
4
GUARANTEED MAX
3
V_MOD/V_SET = 0.8 (87.5%)
DIVCODE = 4
2 ^{3 PARTS}
1
0
–1
–2
–3
–4
GUARANTEED MIN
–5
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
6992 G23
N_DIV = 1 Duty Cycle Clamps
vs Temperature
97
DIVCODE = 0
96 _{3 PARTS}
95
94
LTC6992-2/LTC6992-3
93
V_MOD = V_SET
92
8
7
6
5
4
3
–50 –25
LTC6992-2/LTC6992-4
V_MOD = GND
0 25 50 75
TEMPERATURE (°C)
100 125
6992 G24
N_DIV > 1 Duty Cycle Clamps
vs Temperature
97
DIVCODE = 4
96 _{3 PARTS}
95
94
93
LTC6992-2/LTC6992-3
92
V_MOD = V_SET
8
7
6
5
4
3
–50 –25
LTC6992-2/LTC6992-4
V_MOD = GND
0 25 50 75
TEMPERATURE (°C)
100 125
6992 G25
Duty Cycle Error vs DIVCODE
5
4
V_MOD/ V_SET = 0.2 (12.5%)
3 PARTS
3
2
1
0
–1
–2
–3
–4
–5
0 2 4 6 8 10 12 14
DIVCODE
6992 G26
Duty Cycle Error vs DIVCODE
5
4
V_MOD/ V_SET = 0.5 (50%)
3 PARTS
3
2
1
0
–1
–2
–3
–4
–5
0 2 4 6 8 10 12 14
DIVCODE
6992 G27
Duty Cycle Error vs DIVCODE
5
4
V_MOD/ V_SET = 0.8 (87.5%)
3 PARTS
3
2
1
0
–1
–2
–3
–4
–5
0 2 4 6 8 10 12 14
DIVCODE
6992 G28
8
N_DIV = 1 Duty Cycle vs V_MOD/ V_SET
100
DIVCODE = 0
90 3 PARTS
80
70
LTC6992-1/
LTC6992-4
LTC6992-2/
LTC6992-3
60
50
40
LTC6992-2/
30 _LTC6992-4
20
10
0
0
LTC6992-1/LTC6992-3
0.2
0.4
0.6
0.8
1
V_MOD/V_SET (V/V)
6992 G29
N_DIV > 1 Duty Cycle vs V_MOD/ V_SET
100
DIVCODE = 4
90 3 PARTS
LTC6992-1/
LTC6992-4
80
LTC6992-2/
70
LTC6992-3
60
50
40
LTC6992-2/
30 _LTC6992-4
20
10
0
0
LTC6992-1/LTC6992-3
0.2 0.4 0.6 0.8
1
V_MOD/V_SET (V/V)
6992 G30
69921234fc