Linear Technology DC2194A, Демонстрационное руководство

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dc2194af
DEMO MANUAL DC2194A
PARAMETER CONDITIONS VALUE
Dual Phase Dual Output Configuration (Default)
Input Voltage Range 4.5V to 20V
Input Voltage Range 2.5V to 20V
(with External CPWR Bias Supply)
Default Output Voltage
V
OUT1
V
OUT2
V
IN
= 4.5V to 20V
I
LOAD
= 0A to 4A
f
SW
= 800kHz
1.8V ±1.5%
1.2V ±1.5%
Default Switching Frequency Programmed Frequency with an External Resistor
from FREQ Pin to SGND
800kHz ±10%
Maximum Continuous Output Current I
OUT
per Channel
(Dual Phase Dual Outputs)
V
IN
= 4.5V to 20V
f
SW
= 800kHz
4A
Output Voltage Ripples
(Peak-to-Peak)
V
OUT1,P-P
V
OUT2,P-P
(Dual Phase Dual Outputs)
V
IN
= 12V
f
SW
= 800kHz
V
OUT1
= 1.8V at I
OUT1
= 4A
V
OUT2
= 1.2V at I
OUT2
= 4A
C
OUT
= 1x150µF + 1x22µF per Channel
V
OUT1
,
P-P
= 27mV (Figure 8a)
V
OUT2
,
P-P
= 17mV (Figure 8b)
Dynamic Load Transient Response
V
OUT1,P-P
V
OUT2,P-P
(Dual Phase Dual Outputs)
V
IN
= 12V
f
SW
= 800kHz
Mode = CCM
V
OUT1
= 1.8V, I
OUT_STEP
= 2A to 4A
V
OUT2
= 1.2V, I
OUT_STEP
= 2A to 4A
C
OUT
= 1x150µF + 1x22µF per Channel
V
OUT1
,
P-P
= 86mV (Figure 7a)
V
OUT2
,
P-P
= 67mV (Figure 7b)
Efficiency
(Dual Phase Dual Outputs)
V
IN
= 12V
f
SW
= 800kHz
V
OUT1
= 1.8V at I
OUT1
= 4A
V
OUT2
= 1.2V at I
OUT2
= 4A
Channel 1: 87.8% (Figure 4)
Channel 2: 84.2% (Figure 4)
Thermal Performance
(Dual Phase Dual Outputs)
V
IN
= 12V
f
SW
= 800kHz
V
OUT1
= 1.8V at I
OUT1
= 4A
V
OUT2
= 1.2V at I
OUT2
= 4A
T
A
= 25°C, No Forced Airflow/Heat Sink
57.2°C Peak Temperature
(Figure 11a)
performance summary
Specifications are at T
A
= 25°C