ZSPM9015 Datasheet, PDF (16/22 Pages) List of Unclassifed Manufacturers – Ultra-Compact, High-Performance, High-Frequency DrMOS Device

ZSPM9015 Datasheet
3.3. Power Loss and Efficiency Testing Procedures
The circuit in Figure 3.1 has been used to measure power losses in the following example. The efficiency has
been calculated based on the equations (1) through (7).
Power loss calculations in Watts:
P_IN = (V_IN ∗I_IN ) + (V_5V ∗I_5V )
(1)
( ) P_SW = V_SW ∗I_OUT
(2)
( ) P_OUT = V_OUT ∗I_OUT
(3)
( ) P_{LOSS_ MODULE} = P_IN − P_SW
(4)
( ) P_{LOSS_ BOARD} = P_IN − P_OUT
(5)
Efficiency calculations:
EFF_MODULE
=
¹⁰⁰
∗
P_SW
P_IN

%
(6)
EFF_BOARD
=
^{100 ∗}
P_OUT
P_IN

%
(7)
© 2016 Integrated Device Technology, Inc.
16
January 25, 2016