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L6917B Datasheet(PDF) 26 Page - STMicroelectronics

Part # L6917B
Description  5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6917B Datasheet(HTML) 26 Page - STMicroelectronics

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Part List
System Efficiency
Figure 22 shows the demo board measured efficiency versus load current for different values of input voltage.
Mosfet temperature is always lower than 115 °C, at Tamb = 25°C.
Figure 22. Efficiency (fosc = 200kHz; Vout = 1.7V)
R1
10k
SMD 0805
R2, R20
Not Mounted
SMD 0805
R3, R4, R5, R6
5.1k
1%
SMD 0805
R7
1.43k
1%
SMD 0805
R8
6.2k
SMD 0805
R10
82
Ω
SMD 0805
R12 to R16, R19
2.2
Ω
SMD 0805
R17, R18
0
Ω
SMD 0805
C2
15n
SMD 0805
C3, C4
100n
SMD 0805
C5, C6, C7
1
µ
Ceramic
SMD 1206
C8, C9, C10
10
µ
Ceramic
SMD 1206
C11, C12, C13
1800
µ / 16V
Rubycon MBZ
Radial 23x10.5
C19 to C24
2200
µ / 6.3V
Rubycon MBZ
Radial 23x10.5
L1, L2
1
µ
TO50 – 52B – 6 Turns
U1
L6917B
STMicroelectronics
SO28
Q1, Q3
STB90NF03L
STMicroelectronics
D2PACK
Q2, Q4
STB70NF03L
STMicroelectronics
D2PACK
D1, D2
STPS340U
STMicroelectronics
SMB
D3, D4
1N4148
STMicroelectronics
SOT23
45
50
55
60
65
70
75
80
85
90
95
0
5
10
15
20
25
30
35
40
Output Current [A]
Vin= 12V
Vin=5V



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