Silicon Laboratories SiLinkPS-EVB Manuel utilisateur

AN74

SiLINKPS-EVB USER’S GUIDE

1. Introduction

The SiLinkPS-EVB is a system power supply board that

provides all the necessary supply voltages for a variety

of Silicon Laboratories’ ProSLIC and silicon DAA

evaluation boards. When used with an appropriate ac/

dc wall adapter, the SiLinkPS-EVB can provide up to

25 W of total output power. Table 1 lists some typical

voltages and currents at the power supply outputs.

Any combination of outputs is possible as long as the

simultaneous total power from all outputs does not

exceed the maximum rated 25 W and can be sufficiently

supported by the input power from the VIN.

The SiLinkPS-EVB is designed with the same footprint

as all ProSLIC evaluation board daughter cards

allowing it to be used in conjunction with multiple

ProSLIC daughter cards to create a modular evaluation

platform.

The SiLinkPS-EVB circuit is based on two power supply

controllers from Linear Technology that provide high

efficiency and low bill-of-materials cost. Both circuits

can be synchronized to the same switching frequency to

reduce power supply switching noise. The outputs can

be configured to support both internal and external

ringing architectures by setting the provided jumpers to

set the desired output voltages. Further modifications

are possible to realize specific output voltage and

current requirements provided the total output power

does not exceed the rated maximum. Schematic

capture and layout gerber files are available for

integration into specific applications. Figure 1 illustrates

a simplified block diagram of the SiLinkPS-EVB supply

board.

2. Operating Instructions

The SiLinkPS-EVB board should always be connected

to the ProSLIC evaluation board platform prior to turning

on the power supply. Plugging any ProSLIC board into a

live high-voltage supply can permanently damage the

ProSLIC ICs. The user should exercise caution when

touching any part of the SiLinkPS-EVB because

dangerous high voltages are present and can cause

injury.

Figure 1. SiLinkPS-EVB Power Supply Simplified Block Diagram

Table 1. Power Supply Specifications

Input/Output Voltage Current Power

VIN 9–15 V 2.5 A 22–37 W

VBRNG –96 V 100 mA 9.6 W

VBHI –52 V or

–78 V

100 mA 5.2 W or

7.8 W

VBLO –26 V 200 mA 5.2 W

VDD 3.3 V/5 V 1 A 3.3 W/5 W

High

Voltage

Battery

Supply

Low

Voltage

VDD

Supply

Jumper

Selection

JP2, JP3,

JP4

JP6 VDD on/off

JP5 3.3 V/5 V Selector

VDC in

VBRNG

VBHI

VBLO

VDD

AN74

Rev. 0.2 2

2.1. High-Voltage Battery Supply

The schematic for this power circuit is illustrated in

Figure 3 on page 4. The LTC3704 dc-dc controller IC is

used to drive an external MOSFET and a multi-tap

transformer to create four equal high-voltage negative

outputs, VNEG (See Table 2), from the dc input supply.

Only one output is regulated via close-loop feedback.

The other three outputs are cross-regulated to the first

output via the transformer ratio. The LTC3704’s

negative feedback input eliminates inverting circuitry

when creating negative outputs from a positive input.

The six-winding 1:1 ratio transformer is configured in a

manner that minimizes the need for multiple high-

voltage output filter capacitors.

2.2. VNEG Voltage Adjustment

The transformer, T1, has four secondary windings, each

producing an equal negative voltage, VNEG. These four

windings are connected in series through the diode

rectifying circuits to produce four negative voltage

potentials with voltage levels equal to multiples from 1

to 4 of the VNEG magnitude. Any adjustment made to

the VNEG has a direct effect on the voltage levels on all

negative outputs.

Resistor R23 can be modified to realize custom output

voltages as defined in the following equation.

VNEG = (1.23 x R23/R22) + 1.23

The SiLinkPS-EVB is shipped with R23 = 33.2 k and

R22 = 1.65 k for VNEG equal to 26 V.

The VBLO is normally used for off-hook state and its

voltage level can be programmed by the setting on the

JP7 jumper. The voltage on the VBHI and VBRNG

outputs can be programmed by moving the jumper

settings on JP2, JP3, and JP4. Table 2 provides several

popular configurations and the required jumper settings.

2.3. Frequency Adjustment

The LTC3704 can be configured to run at switching

frequencies from 50 kHz to 1 MHz allowing flexibility to

choose the optimal efficiency/cost point for each

specific application. Resistor R18 programs the

switching frequency according to the characteristic

curve shown in Figure 2.

Figure 2. Timing Resistor R18 Value

FREQUENCY (kHz)

100

(kΩ)

300

1000

100

200 1000

900

800700600

500

400

Table 2. Popular Application Configurations and Jumper Settings

Dual ProSLIC

Part Number

PK-PK Ringing

Amplitude

VBRNG VBHI VBLO JP2 JP3 JP4 JP7

Si3211/Si3212

Si3220/Si3232

75 V — –78 V

3xVNEG

–26 V

VNEG

2–3 2–3 1–2 2–3

90 V –104 V

4xVNEG

—–26V

VNEG

1–2 — — 2–3

Si3225 N/A (external) — –52 V

2xVNEG

–26 V

VNEG

2–3 — 2–3 2–3

AN74

Rev. 0.2 3

2.4. Low Voltage VDD Supply

The low-voltage supply provides a switchable 3.3 V or

5 V output with a 1 A maximum load current. The

schematic for this power supply circuit is illustrated in

Figure 4 on page 5. The LT1375 IC integrated 1.5 A

bipolar switching transistor and current-sensing circuitry

eliminate external power transistors and sense resistors

and provide a high-efficiency VDD supply in a small

footprint. The switching frequency is internally fixed at

500 kHz and can be synchronized to higher frequencies

up to 1 MHz when a higher frequency signal (above

550 kHz) is provided on the SYNC pin. Table 3 provides

the jumper settings for selecting a 3.3 V or 5 V output as

well as for disconnecting the VDD supply altogether.

2.5. Frequency Synchronization

The LTC3704 is wired as a clock master device to

provide its switching frequency to the SYNC pin on the

LT1375 IC. To synchronize the frequency between the

two power circuits, R18 needs to be adjusted to set the

LTC3704 switching frequency at or above 550 kHz. The

LT1375 IC operates at its internal fixed 500 kHz and is

only synchronized with the LTC3704 frequency when it

senses the frequency on the SYNC pin going above

550 kHz. The SiLinkPS-EVB power circuits are

designed to operate safely with switching frequency on

the LTC3704 ranging from 200 kHz to 1 MHz.

2.6. Initialization Steps

1. Configure all jumpers according to the application

requirements.

2. (Optional) Plug in the input power source and

measure all outputs to verify correct settings.

3. Unplug input power source.

4. Assemble all ProSLIC daughter cards.

5. Plug in the input power source.

2.7. Cost-Optimized Design

The negative high-voltage circuit can be reduced for

cost optimization. The four equal VNEG outputs in

series arrangement provide some discrete voltage

adjustments to the outputs but require additional

rectifying diode circuits and increase cost. Figure 6 on

page 8 illustrates a lost-optimized design with two

negative outputs. The first secondary winding produces

a negative voltage according to the VNEG equation

described in the previous section to produce the VBLO

voltage. The other three secondary windings are

connected in series to produce a negative voltage with

an amplitude of 3 x VNEG. This output is connected in

series with the VBLO output to generate VBHI output

with a voltage level of 4 x VNEG.

The use of the simplified secondary rectifying circuit,

smaller transformer, and switching MOSFET lower the

component costs and also reduce the maximum output

power of the negative high-voltage circuit to 13 W.

Table 3. VDD Supply Jumper Settings

Function JP5 JP6 Comments

VDD output

enable

— 1–2 VDD connected

— 2–3 VDD disconnected

3.3 V/5 V

configuration

1–2 — 5 V selected

2–3 — 3.3 V selected

AN74

4 Rev. 0.2

IntVcc

-78Vdc

-104Vdc

-25Vdc

-96V

DC_Input

-52V

-78V

-52V

VBRNG

VBHI

VBLO

DC_Input_Diode

VDD

DC_Input_Diode

VBLO

VBHI

VBRNG

Gate

-52Vdc

VBHI JP3 JP4

-52V X 2-3

-78V 2-3 1-2

-96V 1-2 1-2

VBRNG JP2

-96V 1-2

n/c 2-3

Post-regulator

Turn-on at 9.9V

Turn-off at 9.1V

(Farside)

VBLO JP7

-25V 2-3

-50V 2-1

10uF, 25V

B1100B

JS3

CONN SOCKET 5x2

122

344

566

788

910 10

10uF, 25V

4.7k

JS1

CONN SOCKET 5x2

122

344

566

788

910 10

10k

100k

C24

330uF 35V

10uH

C20

100pF

C25

4.7uF, 50V

LTC3704EMS

Run

NFB

Ith

Gnd 6

Sense 10

Gate 7

IntVcc 8

Vin 9

Freq

Mode/Sync

IRL540NS

C21

4.7uF, 10V

C22

.001uF

C19

4.7uF, 50V

R21

82k

B1100B

10k

1uF, 25V

R23

33.2k, 1%

R15

10k

R22

1.65k, 1%

R20

.02, 1%

C11

1uF, 25V

JP3

JP7

CMR3-02

JP4

C15

1uF, 25V

T1D

R17

4.7

T1C

C18

0.1uF

T1F

JS2

CONN SOCKET 2x2/SM

C14

.001uF

T1E

T1B

D12

B1100B

C17

10uF, 25V

C13

1uF, 100V

JS4

CONN SOCKET 5x2

JP1

CONN HEADER 2x2/SM

122

344

R14

82k

R19

R13

13k

C23

.001uF

C12

10uF, 25V

D11

B1100B

C10

1uF, 100V

FZT953CT

JS5

CONN SOCKET 5x2

R11

10k

R25

47V

JP2

T1A

VP5

R18

31.6k, 1%

D10

47V

Figure 3. High-Voltage Negative Battery Supply

AN74

Rev. 0.2 5

VDD

DC_Input_Diode

Gate

5V 1-2

3.3V 2-3

5V or 3.3V

1A Max

VDD on

VDD off

VDD

1uF, 25V

R26

10k

C26

100pF

4.7nF

1N4148

JP5

0.1uF

22uF, 6.3V

B1100B

JP6

LT1375CS8

BOOST

Vin

Vsw

SHDN

4SYNC 5

GND 6

FB 7

Vc 8

11.5k, 1%

31.6k, 1%

16.2k, 1%

R28

10k

15uH, 1.8A

R27

10k

Figure 4. Low-Voltage VDD Supply

AN74

6 Rev. 0.2

Figure 5. PS Board Silkscreen

AN74

Rev. 0.2 7

3. Si Link PS–EVB Bill of Materials

Re fere nce De scription Pa rt Num be r Ma nufa cture r

C1 22uF, 6.3V

C2 0.1uF, 10V

C3,C8,C11,C15 1uF, 25V

C4 4.7nF, 10V

C5,C9,C12,C17 10uF, 25V TMK432BJ106KM Taiyo Yuden

C7,C10,C13 1uF, 100V 18121C105KAT9A United Chemi-con

C22,C14 .001uF, 25V 08055C102KAT AVX

C18 0.1uF, 35V 08053C104KAT AVX

C16, C19 4.7uF, 50V C5750X7R1H475K TDK

C20,C26 100pF, 25V 08055A101KAT AVX

C21 4.7uF, 10V LMK316BJ475 Taiyo Yuden

C23 .001uF, 25V

C24 330uF, 35V

D2 1N4148 Diodes, Inc.

D3 ES3A/B ES3A/B Diodes, Inc.

D1,D5,D8,D11,D12 B1100B B160B Diodes, Inc.

D9,D10 47V Zener

JP1 CONN HEADER 2x2/SM TSM-102-02-T-DV Samtec

JP2,JP3,JP4,JP5,JP6,JP7 HEADER 3X1 2303-6111TN 3M

JS1,JS3,JS4,JS5 CONN SOCKET 5x2 SSQ-1-05-24-F-D Samtec

JS2 CONN SOCKET 2x2/SM SSM-102-L-DV-TR Samtec

J1 CONN PW R 2-P ADC-002-1 Adam Tech

L1 15uH, 1.8A UP1B-150 Coiltronics

L2 10uH CTX32CT-100 Coiltronics

Q1 FZT953CT FZT953CT Zetex

Q2 IRL540NS IRL540NS Int. Rectifier

R1 11.5k, 1%

R2 31.6k

R3 16.2k

R4,R9,R11,R15,R26,R27,R28 10k

R6 10k

R7 100k

R8 4.7k

R13 13k

R21,R14 82k

R17 4.7

R18 120k

R19 47

R20 15m LRC1206-R015K IRC

R22 1.65k

R23 33.2k

R25 0

T1 VP5 VPH5-0155 Coiltronics

U1 LT1375CS8 LT1375CS8 LTC

U2 LTC3704EMS LTC3704CMS LTC

AN74

8 Rev. 0.2

IntVcc

-24Vdc

DC_Input -96Vdc

VBHI

VBLO

DC_Input_Diode

VDD

VBRNG

VBLO

VBHI

Turn-on at 9V

Turn-off at 8.2V

T1: 10uH

L2 and C16 optional for lower output noise.

In Proto:

R23 = 20.5k

R22 = 1.1k

C5 = 2 x 1uF / 100V in parallel

R4 = 3 x 10k in series

Q2 is upside-down

36k = 500kHz

20k = 1MHz

10~15Vdc

Input

JS4

CONN SOCKET 5x2

122

344

566

788

910 10

2.2uF, 100V

C16

10uF, 25V

JS3

CONN SOCKET 5x2

122

344

566

788

910 10

30k

C24

330uF 35V

10uH

C20

680pF

JP1

LTC3704EMS

Run

NFB

Ith

Gnd 6

Sense 10

Gate 7

IntVcc 8

Vin 9

Freq

Mode/Sync

C22

.01uF

C21

4.7uF, 10V

R21

82k

C19

4.7uF, 50V

R20

.015, 5%

JS1

CONN SOCKET 5x2

122

344

566

788

910 10

R15

10k

R23

34.8k, 1%

R22

1.87k, 1%

Si4480DY

2 3

7 8

ES1D

B340

R18

36k

T1D

R17

4.7

T1C

C18

0.1uF

T1F

T1E

C14

.001uF

T1B

D12

B1100B

C17

10uF, 25V

JS2

CONN SOCKET 2x2

R14

82k

R13

16k

JS5

CONN SOCKET 5x2

T1A

VP5

Figure 6. Cost-Optimized Dual Output Battery Supply

AN74

Rev. 0.2 9

4. Cost-Optimized Dual Output Battery Supply Bill of Materials

Reference Description Part Number Manufacturer

C18

0.1 F, 25 V, X7R

08053C104KAT AVX

2.2 F, 100 V, X7R

C5750X7R2A225M TDK

C22, C14 1 nF, 25 V, X7R

C16*, C17

10 F, 25 V, X5R

TMK432BJ106KM Taiyo Yuden

C19

4.7 F, 50 V, X7R

UMK325F475KH Taiyo Yuden

C20

100 pF, 50 V, NP0

08055A101KAT AVX

C21

4.7 F, 10 V, X5R

LMK316BJ475 Taiyo Yuden

C24

330 F, 35 V

35CV330AX Sanyo

D3 40 V, 3 A B340 Diodes, Inc.

D4 200 V, 1 A ES1D Diodes, Inc.

D12 100 V, 1 A Shottky B1100B Diodes, Inc.

L2*

10 H, 300 mA

CTX32CT-470 Coiltronics

Q2 80 V Si4480DY Vishay

30 k, 5%, 0.25 W

R13

16 k, 5%, 0.1 W

R21, R14

82 k, 5%, 0.1 W

R15

10 k, 5%, 0.1 W

R17

4.7 , 5%, 0.1 W

R18

36 k, 5%, 0.1 W

R20

15 m



, 5%, 0.25 W

R22

1.87 k



, 1%, 0.1 W

R23

34.8 k



, 1%, 0.1 W

10 H

SP36-0100-10 Transpower

U2 Switching Regulator LTC3704EMS LTC

Note: * Optional components used to reduce output noise if necessary.

AN74

10 Rev. 0.2

DOCUMENT CHANGE LIST

Revision 0.1 to Revision 0.2

New power supply schematics

Updated Figures 3, 4, and 5.

Updated document to support two levels of VBATL

voltage.

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