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ADP1147 Folha de dados(PDF) 6 Page - Analog Devices

Nome de Peças ADP1147
Descrição Electrónicos  High Efficiency Step-Down Switching Regulator Controller
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

ADP1147 Folha de dados(HTML) 6 Page - Analog Devices

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ADP1147-3.3/ADP1147-5
–6–
REV. 0
3.3V
0V
(a) Continuous Mode Operation
3.3V
0V
(b) Power Saving Mode
Figure 19. CT Waveforms
1000pF
SHUTDOWN
P-DRIVE
SENSE(+)
SENSE(–)
ADP1147-3.3
ITH
CT
VIN
1 F
RSENSE
VOUT
1k
3300pF
CT
390pF
VIN
GROUND
CIN
D1
P-CHANNEL
L
SHUTDOWN
COUT
GROUND
PLANE
Figure 20. Circuit Diagram Indicating the Recommended
Ground Plane Scheme for PCB Layout
1
2
3
4
U1
ADP1147-5
P-DRV
SNS–
ITH
CT
VIN
GND
SHD
SNS+
R3
100
R4
100
R2
0.02
VOUT 5V/3A
C7
2.2nF
C9–C11
220 F
10V
OS-CON
+
R1
1k
C6
3.3nF
C5
470pF
L1
50 H
+
C1
1 F
D3
1N4148
R5
20k
R6
470
Q1
2N3906
Q2
2N2222
R7
220
Q4
IRF7403
Q3
VN2222LL
D2
30BQ040
+
C2-C4
220 F/16V
OS-CON
C8
1 F
D1
1N4148
VIN
6V TO 14V
8
7
6
5
Figure 21. 5 V/3 A Regulator Using N-Channel Device
IRF7204
L*
50 H
1nF
SHUTDOWN
GND
P-DRIVE
SENSE(+)
SENSE(–)
ADP1147-3.3
ITH
CT
VIN
1 F
RSENSE**
50m
VOUT
3.3V/2A
RC
1k
3300pF
CT
620pF
VIN
4V–14V
D1
30BQ040
SHUTDOWN
COUT
220 F
6.3V
X2
CIN
100 F
25V
*COILTRONICS
CTX50-4
**KRL SL-1-C1-0R050J
Figure 22. 3.3 V/2 A Regulator
LOAD CURRENT – mA
100
95
60
1
10K
10
100
1K
80
75
70
65
90
85
VIN = 6 VOLTS
VIN = 10 VOLTS
Figure 23. Efficiency vs. Load Current at VO = 3.3 V;
Figure 22 Circuit


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