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ADP1883ARMZ-1.0-R7 датащи(PDF) 30 Page - Analog Devices

номер детали ADP1883ARMZ-1.0-R7
подробное описание детали  Synchronous Current-Mode with Constant On-Time,PWM Buck Controller
PDF  40 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADP1883ARMZ-1.0-R7 датащи(HTML) 30 Page - Analog Devices

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ADP1882/ADP1883
Rev. 0 | Page 30 of 40
Loss Calculations
PSW(LOSS) = fSW × RGATE × CTOTAL × ILOAD × VIN × 2
= 300 × 103 × 1.5 Ω × 3.3 × 10 − 9 × 15 A × 12 × 2
= 534.6 mW
Duty cycle = 1.8/12 V = 0.15.
[
RON (N2) = 5.4 mΩ.
tBODY(LOSS) = 20 ns (body conduction time).
VF = 0.84 V (MOSFET forward voltage).
CIN = 3.3 nF (MOSFET gate input capacitance).
QN1,N2 = 17 nC (total MOSFET gate charge).
RGATE = 1.5 Ω (MOSFET gate input resistance).
()
[
] 2
LOAD
I
×
1
N2(ON)
N1(ON)
N1,N2(CL)
R
D
R
D
P
×
−
+
×
=
= (0.15 × 0.0054 + 0.85 × 0.0054) × (15 A)2
= 1.215 W
2
)
(
)
(
×
×
×
=
F
LOAD
SW
LOSS
BODY
LOSS
BODY
V
I
t
t
P
= 20 ns × 300 × 103 × 15 A × 0.84 × 2
= 151.2 mW
(
)
]
BIAS
DR
upperFET
SW
DR
LOSS
DR
I
V
C
f
V
P
=
×
+
)
(
+
[
(
)
]
I
f
V
BIAS
DD
upperFET
SW
DD
V
C
+
×
2
LOAD
I
= (5.12 × (300 × 103 × 3.3 × 10−9 × 5.12 + 0.002))
+ (5.5 × (300 × 103 × 3.3 × 10−9 × 5.5 + 0.002))
= 77.13 mW
PCOUT = (IRMS)2 × ESR = (1.5 A)2 × 1.4 mΩ = 3.15 mW
PDCR(LOSS) = DCR ×
= 0.003 × (15 A)2 = 675 mW
PCIN = (IRMS)2 × ESR = (7.5 A)2 × 1 mΩ = 56.25 mW
PLOSS = PN1,N2 + PBODY(LOSS) + PSW + PDCR + PDR + PCOUT + PCIN
= 1.215 W + 151.2 mW + 534.6 mW + 77.13 mW +
3.15 mW + 675 mW + 56.25 mW
= 2.62 W



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