Typical operating characteristics (continued) – Rainbow Electronics MAX5081 User Manual
Page 5
OPERATING FREQUENCY
vs. TEMPERATURE
MAX5080 toc07
TEMPERATURE (
°C)
OPERATING FREQUENCY (kHz)
110
85
35
60
10
-15
242
244
246
248
250
252
254
256
258
260
240
-40
135
V
IN
= 4.5V
V
IN
= 40V
MAXIMUM DUTY CYCLE
vs. INPUT VOLTAGE (MAX5080)
MAX5080 toc08
INPUT VOLTAGE (V)
MAXIMUM DUTY CYCLE (%)
35
30
20
25
10
15
5
82
84
86
88
90
92
94
96
98
100
80
0
40
MAXIMUM DUTY CYCLE
vs. INPUT VOLTAGE (MAX5081)
MAX5080 toc09
INPUT VOLTAGE (V)
MAXIMUM DUTY CYCLE (%)
35
30
20
25
10
15
5
82
84
86
88
90
92
94
96
98
100
80
0
40
MAX5080/MAX5081
1A, 40V, MAXPower Step-Down
DC-DC Converters
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(V
IN
= 12V, see Figure 5 (MAX5080) and Figure 6 (MAX5081), T
A
= +25°C, unless otherwise noted.)
OPEN-LOOP GAIN/PHASE vs. FREQUENCY
MAX5080 toc10
FREQUENCY (kHz)
GAIN (dB)
PHASE (DEGREES)
1000
100
10
1
0.1
0.01
0.001
0
20
40
60
80
100
-20
75
100
125
150
175
50
0
10,000
GAIN
PHASE
OUTPUT CURRENT LIMIT
vs. INPUT VOLTAGE
MAX5080 toc11
INPUT VOLTAGE (V)
OUTPUT CURRENT LIMIT (A)
35
30
20
25
10
15
5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
1.5
0
40
MAX5080
T
A
= +135
°C
T
A
= +25
°C
T
A
= +85
°C
T
A
= -40
°C
TURN-ON/OFF WAVEFORM
MAX5080 toc12
I
LOAD
= 1A
V
OUT
2V/div
V
ON/OFF
2V/div
2ms/div
TURN-ON/OFF WAVEFORM
MAX5080 toc13
V
ON/OFF
2V/div
V
OUT
2V/div
2ms/div
I
LOAD
= 100mA