SI3201-X-FS SILABS [Silicon Laboratories], SI3201-X-FS Datasheet - Page 17

• Manufacturer Part Number: SI3201-X-FS
• Manufacturer: SILABS [Silicon Laboratories]

Note: There are other system and software conditions that influence component value selection. Please refer to “AN45:
Note: There are other system and software conditions that influence component value selection. Please refer to “AN45:
VDC
12 V
24 V
3.3 V
5.0 V
VDC
12 V
5 V
Component
24
“Design Guide for the Si3210/15/16 DC-DC Converter” for detailed guidance.
“Design Guide for the Si3210/15/16 DC-DC Converter” for detailed guidance.
Table 17. Component Value Selection Examples for BJT/Inductor DC-DC Converter
R28
R29
Maximum Ringing Load/Loop Resistance
Maximum Ringing Load/Loop Resistance
for Si3233M MOSFET/Transformer DC-DC Converter
For V
Table 16. Component Value Selection for Si3233
For V
For V
Table 18. Component Value Selection Examples
For V
For V
3 REN/117 Ω
5 REN/117 Ω
5 REN/117 Ω
3 REN/117 Ω
5 REN/117 Ω
5 REN/117 Ω
5 REN/117 Ω
1/10 W, 1% resistor
1/10 W, 1% resistor
CLAMP
CLAMP
CLAMP
DD
DD
= 3.3 V: 26.1 kΩ
= 5.0 V: 37.4 kΩ
Value
= 100 V: 676 kΩ
= 80 V: 541 kΩ
= 85 V: 574 kΩ
Preliminary Rev. 0.5
where V
Transformer Ratio
150 µH
220 µH
67 µH
L1
where V
CLAMP
1:2
1:2
1:3
1:4
R28 = (V
R29 = V
BE
150 Ω
162 Ω
175 Ω
is the clamping voltage for V
R17
is the nominal VBE for Q9
Comments
DD
CLAMP
+ V
0.06 Ω
0.10 Ω
0.6 Ω
2.1 Ω
BE
R18
0.15 Ω
0.56 Ω
/148 µA
2.0 Ω
R18
)/148 µA
Si3233
R19, R20
R19, R20
16.5 kΩ
7.15 Ω
16.5 Ω
56.2 Ω
56.2kΩ
121 kΩ
121 Ω
BAT
17