ADP1882-1.0-EVALZ Analog Devices Inc, ADP1882-1.0-EVALZ Datasheet - Page 30

• Manufacturer Part Number: ADP1882-1.0-EVALZ
• Description: 1 MHz Synchronous Current-Mode Buck Controller Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of ADP1882-1.0-EVALZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: PWM Buck Controller
• Kit Application Type: Power Management - Voltage Regulator
• Silicon Core Number: ADP1882
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADP1882/ADP1883
Loss Calculations
Duty cycle = 1.8/12 V = 0.15.
R
t
V
C
Q
R
BODY(LOSS)
ON (N2)
GATE
F
IN
N1,N2
= 0.84 V (MOSFET forward voltage).
= 3.3 nF (MOSFET gate input capacitance).
= (0.15 × 0.0054 + 0.85 × 0.0054) × (15 A)
= 1.215 W
= 20 ns × 300 × 10
= 151.2 mW
P
P
= 1.5 Ω (MOSFET gate input resistance).
= 17 nC (total MOSFET gate charge).
N1,N2(CL)
BODY
= 5.4 mΩ.
= 20 ns (body conduction time).
(
LOSS
=
)
[
=
D
t
×
BODY
R
t
N1(ON)
SW
3
(
× 15 A × 0.84 × 2
LOSS
)
+
×
(
1
I
−
LOAD
D
)
×
×
R
V
N2(ON)
F
×
2
]
I ×
2
LOAD
2
Rev. 0 | Page 30 of 40
P
= 300 × 103 × 1.5 Ω × 3.3 × 10 − 9 × 15 A × 12 × 2
= 534.6 mW
+
= (5.12 × (300 × 10
+ (5.5 × (300 × 10
= 77.13 mW
P
P
P
P
= 1.215 W + 151.2 mW + 534.6 mW + 77.13 mW +
3.15 mW + 675 mW + 56.25 mW
= 2.62 W
P
SW(LOSS)
COUT
DCR(LOSS)
CIN
LOSS
DR
[
V
= (I
(
DD
= P
LOSS
= (I
×
= f
RMS
N1,N2
= DCR ×
RMS
)
(
SW
f
)
=
2
SW
)
+ P
× ESR = (7.5 A)
2
× R
[
V
× ESR = (1.5 A)
C
DR
upperFET
BODY(LOSS)
GATE
3
3
× 3.3 × 10
×
I
× 3.3 × 10
2
LOAD
× C
(
V
f
SW
DD
TOTAL
+ P
= 0.003 × (15 A)
C
+
SW
upperFET
2
I
−9
× I
× 1 mΩ = 56.25 mW
2
BIAS
−9
+ P
× 5.5 + 0.002))
× 1.4 mΩ = 3.15 mW
× 5.12 + 0.002))
LOAD
DCR
) ]
V
× V
+ P
DR
IN
DR
2
+
× 2
= 675 mW
+ P
I
BIAS
COUT
) ]
+ P
CIN