SI3201-X-FS View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI3201-X-FS

PROSLIC® PROGRAMMABLE CMOS SLIC WITH RINGING/BATTERY VOLTAGE GENERATION

Silicon Laboratories 

Si3233

Component

R28

R29

Table 16. Component Value Selection for Si3233

Value

1/10 W, 1% resistor

For VDD = 3.3 V: 26.1 kΩ

For VDD = 5.0 V: 37.4 kΩ

1/10 W, 1% resistor

For VCLAMP = 80 V: 541 kΩ

For VCLAMP = 85 V: 574 kΩ

For VCLAMP = 100 V: 676 kΩ

Comments

R28 = (VDD + VBE)/148 µA

where VBE is the nominal VBE for Q9

R29 = VCLAMP/148 µA

where VCLAMP is the clamping voltage for VBAT

Table 17. Component Value Selection Examples for BJT/Inductor DC-DC Converter

VDC

Maximum Ringing Load/Loop Resistance

L1

R17

R18 R19, R20

5V

3 REN/117 Ω

67 µH

150 Ω

0.15 Ω 16.5 kΩ

12 V

5 REN/117 Ω

150 µH

162 Ω

0.56 Ω 56.2kΩ

24 V

5 REN/117 Ω

220 µH 175 Ω

2.0 Ω

121 kΩ

Note: There are other system and software conditions that influence component value selection. Please refer to “AN45:

“Design Guide for the Si3210/15/16 DC-DC Converter” for detailed guidance.

Table 18. Component Value Selection Examples

for Si3233M MOSFET/Transformer DC-DC Converter

VDC

Maximum Ringing Load/Loop Resistance Transformer Ratio

R18

R19, R20

3.3 V

3 REN/117 Ω

1:2

0.06 Ω

7.15 Ω

5.0 V

5 REN/117 Ω

1:2

0.10 Ω

16.5 Ω

12 V

5 REN/117 Ω

1:3

0.6 Ω

56.2 Ω

24

5 REN/117 Ω

1:4

2.1 Ω

121 Ω

Note: There are other system and software conditions that influence component value selection. Please refer to “AN45:

“Design Guide for the Si3210/15/16 DC-DC Converter” for detailed guidance.

Preliminary Rev. 0.5

17

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