Linear Technology DC1900A, Demo Manual

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dc1900af
DEMO MANUAL DC1900A
Quick start proceDure
Figure 2. Measured Supply Efficiency at 5V
IN
and 12V
IN
LOAD CURRENT (A)
75
EFFICIENCY (%)
83
95
77
79
81
87
89
85
93
91
1 2 3
DC1900A F01a
4 0
3.3V
OUT1
2.5V
OUT2
1.5V
OUT3
1.2V
OUT4
5V
IN
LOAD CURRENT (A)
75
EFFICIENCY (%)
83
95
77
79
81
87
89
85
93
91
1 2 3
DC1900A F01b
4 0
3.3V
OUT1
2.5V
OUT2
1.5V
OUT3
1.2V
OUT4
12V
IN
Figure 3. Measured V
OUT1
= 3.3V and V
OUT4
= 1.2V Load Transient Responses (2A to 4A Load Step)
Figure 4. Measured Thermal Capture with All Phases at Full Load (4A)
20µs/DIV DC1900A F03a
V
OUT1
200mV/DIV
V
IN
= 12V
V
OUT
= 3.3V
2× 47µF/6.3V/CERAMIC
LOAD STEP SLEW RATE = 1A/µs
I
OUT1
2A/DIV
20µs/DIV DC1900A F03b
V
OUT4
200mV/DIV
I
OUT4
2A/DIV
V
IN
= 12V
V
OUT
= 1.2V
2× 47µF/6.3V/CERAMIC
LOAD STEP SLEW RATE = 1A/µs
DC1900A F04 V
IN
= 12V
V
OUT1
= 3.3V, V
OUT2
= 2.5V, V
OUT3
= 1.5V, V
OUT4
= 1.2V
NATURAL CONVECTION
AMBIENT TEMPERATURE = 31.2°C
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