Linear Technology DC1768A, Демонстрационное руководство

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dc1768af
DEMO MANUAL DC1768A
20
35
50
65
80
95
1.00E-03 1.00E-02 1.00E-01 1.00E+00 1.00E+01
Efficiency (%)
Load Current (A)
Vo = 3.3V
Vo = 1.8V
Vo = 1.2V
With a Current Sense Resistor of 4.02k Connected to Both The Input and Output Current Monitors, Their Voltages Equate to:
V
IOUTMON
= 2A/16000 × 4.02k = 0.503V
V
INMON
= 620mA/16000 × 4.02k = 0.156V
Figure 8. Efficiency Graph V
IN
= 12V, Burst Mode,
f
SW
= 1MHz L:1 μH Vishay IHLP-2020BZ-ER-1R0-MO1
QUICK START PROCEDURE
Figure 7. Input and Output Current Monitoring V
IN
= 12V, I
IN
= 620mA, V
OUT
= 3.3V, I
OUT
= 2A, f
SW
= 1MHz
Trace 1: I
OUTMON
Voltage (0.5V/DIV) Trace 2: I
INMON
Voltage (0.1V/DIV) Trace 3: I
OUT
Current (2A/DIV)
Trace 4: I
IN
Current (500mA/DIV)