EK65 datasheet, PDF - EEWORLD Datasheet

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EK65: DescriptionAmplification module and development tool eval kit mp400fc; CategoryDevelopment board/suite/development tools; File Size391KB，4 Pages; ManufacturerCirrus Logic; Websitehttp://www.cirrus.com

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EK65 Overview

Amplification module and development tool eval kit mp400fc

EK65 Parametric

Parameter Name	Attribute value
Maker	Cirrus Logic
Product Category	Amplification modules and development tools
RoHS	no
product	Amplifier Modules

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P r o d u

c t I

MP400

o n F

F r o m

EK65

t i r o m

EK65

Evaluation Kit for MP400FC

Introduction

The EK65 Evaluation kit is designed to provide a convenient way to breadboard and evaluate design ideas for the

MP400FC power operational amplifier. The evaluation board is pre-wired for all required external components. The

evaluation board has been laid out and labeled to easily configure the high voltage operational amplifier in a non-

inverting differential configuration for single supply operation using the MP400FC boost supply (Refer to Application

Note 21). However, the evaluation board is flexible enough to analyze a multitude of standard or proprietary circuit

configurations.

Before You Get Started

•

Please read this data sheet in it’s entirety before starting to construct your evaluation board.

All APEX amplifiers should be handled using proper ESD precautions.

Do not change connections while the circuit is powered.

Initially set all power supplies to the minimum operating voltage allowed in the device data sheet.

The MP400FC is a high voltage amplifier with an integrated switch mode power supply. Though the input

voltage will be 50V or less, the MP400FC can generate voltages greater then 350V. The high generated

voltage will be present on the evaluation board. Caution must be used when working with the evaluation

board.

Ro1 Ro2 Ro3 Ro4

Rb1

Rf–

Rin–

–

Cc+

Cc–

Rb2

Input

Rin+

Rf+

Rtrim

20K Rset

Input

Analog GND

–Vs

PWR GND

Cin

100µF

Vin

CC–

–Vs X1

Out

–IN

ILIM

+IN

CR–

+Vs

CR+

CC+

LFin

AGND

Rset

PGND VBoost

PGND

PGND Q2D

Vin

Vbias

Vin

Rcl

Out

Load

1µF

–

Cb1

Cb3 Analog GND

Cb2

Cb4

1.5nF

Vin

–

Figure 1 - EK65 Schematic

Parts List (Included with kit)

Ref.

N/C

BJ1-6

BN1

Cb1

Rtrim

EK65U

Description/Vendor

Heat Sink

Strip of 30 cage jacks

PC board

Hex standoff, 4-40x1/4

Screw, 4-40x3/16

Banana Jack, PC

BNC, PC mount

Cap. 1 µF, 500V

Novacap

ST2225B105K501LLXW

EKMQ401VSN121MP30S Cap. 120µF, 400V

T93YA203KT20

Trim Pot, 20K

Apex P/N

HS26

MS11

EVAL65

93505A430

90272A105

571-0100

146510CJ

ZX7R105KTL

Qty.

www.cirrus.com

AUG 2009

APEX - EK65UREVB

EK65

P r o d u c t I n n o v a t i o nF r o m

Required Components (Not included with kit)

Description

Capacitor, Low ESR electrolytic, 100µF or greater with voltage rating greater then the anticipated input volt-

age.

Cb1-4 Cboost capacitor, Low ESR electrolytic with voltage rating greater then the anticipated boost voltage. Refer

to the MP400FC data sheet for Cboost selection. One 120µF, 400V electrolytic capacitor (Cb1) is supplied

with the kit and is adequate for most applications. The value of Cboost is selected to meet required boost

supply ripple voltage specifications for the application and to minimize switching noise on the boost supply.

Cboost will be as large as reasonably possible, in the range of 100µF to 500µF. An area on the evaluation

board large enough for 4 parallel 22mm diameter capacitors is provided. This allows maximum flexibility in

the select of the capacitors for Cboost. Capacitors with snap in terminals should still be soldered to the evalu-

ation board to minimize resistance.

Rset Boost voltage programming resistor. Refer to the MP400FC data sheet for calculation of Rset. Select a

higher standard value resistor and use Rtrim (supplied) to calibrate the boost voltage to the exact desired

value. Alternatively, Rtrim can be used alone for a fully adjustable boost supply.

Rcl

Operational amplifier current limit resistor. Refer to the MP400FC data sheet for selection of the current limit

resistor.

Ref.

Cin

Optional Components (Not included with kit)

Ref.

Description

Boost supply filter inductor. The MP400FC includes a 47µH inductor in series with the LFin pin and the +Vs

supply of the high voltage op amp. This on board inductor forms a 2 pole LC filter with C1 and an on board

parallel 0.1µF capacitor. Combined with a properly selected Cboost, the high voltage DC boost voltage

will be sµfficiently clean for most applications. However an external inductor between Vboost and LFin, or

Vboost and +Vs can be used for additional filtering of the Boost supply voltage if necessary. Addition capaci-

tance can be added to the filter between +Vs and AGND.

Cs, Rs

Also useful for boost supply filtering. These components form an RC snubber from drain to source

of the boost supply MOSFET switch. This snubber will help reduce or eliminate overshoot and ringing of

the MOSFET switch at switch turn-off that can appear on the boost supply voltage. The component values

shown on the schematic are adequate for most applications but can be adjusted for your specific application.

The power in the resistor can be estimated by the formula PD = F*C*V2, where

F = 100 KHz of the switching supply

C = the value of Cs

V = the anticipated Vboost voltage.

Rs must be non-inductive. MP900 and MP9000 series resistors from Caddock Electronics or equivalent

resistors can be used.

Rs may require a heat sink such as Apex part number HS28 or HS23. Mounting holes for a heat sink are

provided on the evaluation board that will accommodate either of these heat sinks.

Cc+, Cc- High voltage op amp compensation capacitors. Refer to the MP400FC data sheet for component selec-

tion.

Ro1-4, Rf+, Rf-, Ri+, Ri-

Op amp gain setting and input bias resistors used for the single supply differential con-

figuration described in applications note 21. Appendix A of apps note 21 provides a procedure for the design

of the differential configuration and selection of these components. Apps note 21 can be down loaded from

the Apex web site. The locations on the board for Ro1-4 are large enough for up to a 3W resistor. 3W 1%

resistor style CPF from Vishay Dale are widely available through distribution. RN60, RN65 or RN70 style

1/2W 1% resistors can be used for the other resistors.

Assembly

During assembly, refer to Figure 1, Figure 2 and the MP400FC data sheet.

Note that the silk screen side of the circuit board is labeled as the “component side”. The other side of the

circuit board will be referred to in these instructions as the “DUT side” of the board.

EK65U

EK65

10.

11.

12.

13.

14.

15.

P r o d u c t I n n o v a t i o nF r o m

16.

17.

18.

J2 is required to connect the high voltage op amp –Vs to AGND for single supply operation. If an external

negative supply voltage will be used, replace J2 with a high quality ceramic bypass capacitor of at least 1µF,

and jumper –Vs to BJ1. BJ1 can be used to connect the negative supply to the evaluation board.

Rin+ and Rin- when installed as marked on the component side of the board near BJ1 and BN1, will con-

figure the op amp in the non-inverting configuration with Rin- to AGND and Rin+ to the input BNC. For an

inverting configuration, rotate Rin+ to AGND and Rin- to the input.

If the snubber Cs and Rs will be used, select and insert the components at the location marked near DUT

pins 12 – 15. If the calculated power dissipation indicates that a heat sink is required for Rs, install it with Rs.

Cs and Rs can be installed after you have started evaluating your design if they are found to be needed.

Vin power can be supplied to your circuitry in the breadboard area. There are two pads located below the

breadboard area near BN1. One labeled Vin and one labeled PGND can be jumpered into your circuit as

needed.

Mount the electrolytic capacitors at Cin, and Cboost from the component side of the PCB. Match the polarity

markings on the PCB. Solder from the DUT side of the PCB. Be sure to fill the holes with solder.

Apply a thin, uniform layer of thermal grease to the back side of the MP400FC. Position the amplifier over the

mounting holes of the HS26 heat sink. Firmly push the amplifier onto the heat sink while slightly rotating the

amplifier back and forth, ending with the mounting holes of the amplifier over the mounting holes in the heat

sink.

Attach the amplifier to the heat sink with the supplied 4-40 x 1/4” male-female hex spacer. Tightened with a

hex nut driver. Make the hex spacers snug but do not over tighten as this provides no benefit and may break

the hardware.

Carefully lower the PCB assemblies onto the heat sink/amplifier assembly until the pins of the amplifier

engage in and are fully seated in the cage jacks aligning the mounting holes in the PCB to the hex spacers.

Use the supplied 4-40 x 3/16” screws to attach the PCB assembly to the hex spacers.

Hook up power and signals as necessary. The amplifier is now ready for testing.

Figure 3 - EK65 Assembly

EK65U

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