Semtech SC202A EVB Manuel utilisateur

POWER MANAGEMENT

SC202A EVB

Evaluation Board

User’s Guide

Description

SC202A EVB is the EVB (Evaluation Board) for the SC202A

Synchronous Step Down Converter in the MLPQ 2.5×3.0

(mm) 13-lead package. The EVB is designed to provide a

working demonstration of the SC202A.

This guide contains information relating to the usage of

the Rev. 2 version of the EVB and should be used in con-

junction with the datasheet for the device. Component

values on the EVB may vary per specic customer require-

ments. The datasheet contains detailed information

including the electrical characteristics and the detailed

features of the device.

This guide can be used to familiarize the user with the

features of the device and for testing electrical character-

istics of particular interest to the reader.

Revision 2.0

Feature Content

Schematic

Bill of Materials

Layout Drawings

Operation

•

SC202A EVB — R2

SC202A EVB

Schematic

S C202 A

Voltage Selection

10µF

TP1

–

No_pop

CTL3

CTL2

CTL1

CTL0

LXJP4

GND

OUT

JP3

JP2

JP1

OUT

–

10µF

No_pop

No_pop No_pop

No_pop

TP2

TP3

OUT

TP4

GND

TP5

TP8

BODE-

TP9

BODE+

TP6

GND

TP7

GND R4

VOUT

SC202A EVB

Bill of Materials

Reference Value Footprint Hardware Notes

C1, C2 10μF 0603

C3 no-pop Pads are included to add a feed-forward capacitor when

external resistors are used.

J1 banana jack pair IN

J2 banana jack pair OUT

JP1, JP2, JP3, JP4 3 pos. jumper 0.100 (in) Jumpers are used to set the CTL pins in either a high or low

state.

R1, R2, R3, R4 no-pop 0603 External pads included for adding external feedback, measur-

ing loop stability.

TP1 test point 0.040 (in) IN

TP3 test point 0.040 (in) OUT

TP5 test point 0.040 (in) LX

TP8 no-pop 0.040 (in) BODE- (used for measuring loop stability)

TP9 no-pop 0.040 (in) BODE+ (used for measuring loop stability)

TP2, TP4, TP6, TP7 test point 0.040 (in) Ground

U1 SC202A 2.5 x 3.0 (mm) Semtech integrated circuit

SC202A EVB

Layout Drawings

Top Layer with Silkscreen

Bottom Layer with Silkscreen

SC202A EVB

Operation

The SC202A EVB provides several features that make it

easy for the user to evaluate performance without adding

external circuitry or requiring unique test equipment. All

reference designators from the schematic drawing are

used in these descriptions.

Input and Output Connections

This EVB is designed with two dierent connection points

for the supply and load. Banana jacks are provided at both

the input (J1) and the output (J2) to provide a simple con-

nection method for standard power supplies and

electronic loads. An alternative connection is included for

each jack so that clip leads can be connected or wires

directly soldered to the PCB. TP1-TP2 serve as the connec-

tions for the input supply and TP3-TP4 serve as the

connections for connecting a load to the output.

Enabling the Device

The SC202A is enabled when at least one CTL pin is pulled

high. Jumpers JP1 through JP4 are used to control each

CTL pin according Table 1.

Table1 — Jumper to Control Pin Assignments

Jumper Control Pin

JP4 CTL3

JP3 CTL2

JP2 CTL1

JP1 CTL0

The SC202A output voltage is set by putting the jumpers

in the proper conguration to produce the desired control

pin states. Table 2 describes the state of each jumper for

each corresponding output voltage setting.

Table 2 — Jumper States for Each Output Setting

JP4 JP3 JP2 JP1 Output

Voltage (V)

RRRR Shutdown

RRRL 0.8

RRLR 1.0

R R L L 1.2

RLRR 1.4

RLRL 1.5

RLLR 1.6

RLLL 1.8

L R R R 1.85

LRRL 1.9

,L R L R 2.0

LRLL 2.2

L L R R 2.5

LLRL 2.8

LLLR 3.0

LLLL 3.3

Note: R = Right hand position, L = Left hand position

If dynamic control is desired, the jumpers can be removed

and a digital I/O source can be connected to the middle

pin of each jumper. Be careful to set the high and low

voltage levels of the digital I/O source to match the

requirements for these pins as described in the SC202A

product datasheet.

SC202A EVB

Other Test Points and Components

LX Switching Node

This evaluation board includes other test points to provide

convenient connection points when testing dierent per-

formance parameters of the SC202A. One test point is

connected to the LX pin (TP5) so that the LX switching

waveform can be monitored with minimal noise impact.

A ground connection test point (TP6) is included next to

TP5 so a standard 100mil jumper connection can be used

to connect a scope probe to this node. Another ground

connection test point (TP7) is included on the bottom side

of the PCB for use when making measurement in that

vicinity.

Frequency Response Testing

Two other test points are included for measuring the feed-

back loop frequency response. TP9 (BODE+) and TP8

(BODE-) are included with resistor pads (R3) that allow the

loop to be broken and replaced with a 20Ω resistor. These

connections can be used with a network analyzer to cal-

culate the gain and phase response of the loop. Note that

the trace connecting the pads of R1 must be cut with a

knife before this measurement can be made. If the board

must be returned to normal after completing these tests,

R3 should be removed and a 0Ω resistor should be placed

in the R1 location.

Programming Other Output Voltages

The SC202A datasheet describes a method for program-

ming output voltages that are not included in the selection

list. This method requires a pair of resistors and a feed-

forward capacitor congured as shown in the schematic

on page 2. In this circuit, R2 is in series with the OUT pin

and R4 is connected from the OUT pin to ground. C3 is the

feed-forward capacitor that properly shifts the frequency

response to maintain stability. The following steps can be

used to program an output voltage not included in the

device:

Cut the trace connecting the pads on R1.

Place a 0Ω resistor at R3.

Calculate R2, R4, and C3 using the method

described in the datasheet.

Congure JP1 to JP4 to produce the programmed

voltage used in the calculations.

In the normal conguration, this EVB does not include any

of these components.

•

Operation (continued)

Semtech Corporation

Power Management Products Division

200 Flynn Road, Camarillo, CA 93012

Phone: (805) 498-2111 Fax: (805) 498-3804

www.semtech.com

Contact Information

SC202A EVB

owner. The information presented in this document does not form part of any quotation or contract, is believed to be

accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any conse-

quence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or

intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected

operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or elec-

trical stress including, but not limited to, exposure to parameters beyond the specied maximum ratings or operation

outside the specied range.

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