Recom R-78s3.3-0.1 User manual

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PA-1

Evaluation Module

R-78S3.3-0.1 Evaluation Module

Description

The R-78S3.3-0.1 Evaluation Module generates 3.3V from a single AA battery or from an external source. By

using the external input source, any voltage source (other types of batteries, energy harvesters, etc.) in the range

from 0.65V to 3.15V can be used. The evaluation module contains an AA battery holder, power switch,

R-78S3.3-0.1 boost converter and a micro-USB connector. Jumper headers are provided to allow various test

measurements to be made. An enable pin puts the R-78S into sleep mode where it draws only 7uA from the

battery.

Part

Number

Input

Voltage Range

Output

Max. Output

Voltage Current

Efficiency

(1)

Max. Capacitive

@ min. Vin @ max. Vin Load

(2)

[VDC]

[mA]

[%]

[µF]

R-78S3.3-0.1 0.65-3.15 3.3 100 92 93 470

Notes:

Note1: Efficiency is tested at 1.5V input voltage and full load.

Note2: Max. capacitive load is tested at nominal input and full resistive load.

Specifications

(measured @ ta= 25°C, 1.5Vin , full load after warm up unless otherwise stated)

BASIC CHARACTERISTICS

Parameter Condition Min. Typ. Max.

Under Voltage Lockout DC-DC OFF 0.4VDC

Overload Capability

(3)

peak duty cycle 10% 150%, 10s

Quiescent Current 160µA

Start-up time 2ms

Rise Time 800µs

Internal Operating Frequency

1200kHz

Minimum Load 0%

Dropout Voltage 150mV

Output Ripple and Noise 20MHz BW 100mVp-p

ON/OFF CTRL DC-DC ON

DC-DC OFF

Open or 0.7V ≤V

CTRL

<Vin

Short to GND or V

CTRL

<0.1V

Input current of CTRL pin 5µA

Standby Current 7µA

Notes:

Note 3: For more information, please refer to “Overload Capability Graph” in the R-78S datasheet.

Features

Evaluation

Module

•3.3V from a single AA battery (boost converter o

from an external source

•Efficiency 93% , >80% at 10% load

•Input range down to 0.65V

•Input and output current measurement capability

•Micro-USB type B or 0.100” (2.54mm) pin output

R-78S3.3-0.1-EVM-1

Caution:

ESD sensitive. Always follow ESD preventative procedures when

handling the product

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R-78S3.3-0.1-EVM-1

Evaluation Module

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R-78S Evaluation Module User Guide

Figure 1: R-78S3.3-0.1 output current vs. input voltage

QUICK START GUIDE

•Insert the AA battery into the battery holder (only one way possible).

•If powering USB-powered demonstrators: plug in the micro-USB cable.

•Turn on and off using the slide switch.

Note: to reduce the power consumption, no indicator LED is fitted. Remember to switch off to conserve the battery.

•The output voltage is accessed via J7 or the USB port.

•To measure the input and output current of the R-78S, remove the jumpers on J4 and J5. J4 and J5 are standard

0.100” (2.54mm) pin headers to allow current measurement device connections (ampere meter, scope probe).

•When an external voltage source (no on-board battery) is used on J3, change the jumper position on J1 to pin 1 and

pin 2 (VEXT).

•When the on-board AA battery is used, change the jumper position on J1 to pin 2 and pin 3 (VBAT).

•To set the R-78S into sleep mode, apply the provided jumper on both pins of J6 (CTRL to GND).

CONTENTS

•R-78S3.3-0.1 Evaluation Module PBA

•Micro-USB Type B to Micro-USB Type B Cable

•Terms and Conditions Letter

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R-78S3.3-0.1-EVM-1

Evaluation Module

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R-78S Evaluation Module User Guide

Figure 2: Component placement

Component List and Functions

Part Description Setting

BAT1 AA battery holder

J1 3 pin 0.100” (2.54mm) header for VEXT and VBAT Factory set to on-board battery

J2* 2 pin 0.100” (2.54mm) header for VBAT and GND Leave open if not used

J3 2 pin 0.100” (2.54mm) header for VEXT and GND

Leave open if not used

J4 2 pin 0.100” (2.54mm) header for Input Current

Leave closed if not used

J5 2 pin 0.100” (2.54mm) header for Output Current

Leave closed if not used

J6 2 pin 0.100” (2.54mm) header for CTRL (Enable) and GND

Leave open if not used

J7 2 pin 0.100” (2.54mm) header for VOUT and GND

Leave open if not used

J8 2 pin 0.100” (2.54mm) header for USB D+ and D- Leave open if not used

S1 Slide switch Factory set OFF

CON1 USB micro B connector

U1 R-78S3.3-0.1 boost converter

*CAUTION:

*CAUTION:*CAUTION:

*CAUTION: DO NOT PLACE A JUMPER ON J2. DOING SO WILL CAUSE THE BATTERY TO SHORT

CIRCUIT AND CREATE THE RISK OF FIRE

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R-78S3.3-0.1-EVM-1

Evaluation Module

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R-78S Evaluation Module User Guide

SCHEMATIC

Figure 3: Schematic

LAYOUT

Figure 4: TOP layer with components

Figure 5: BOTTOM layer

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R-78S3.3-0.1-EVM-1

Evaluation Module

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R-78S Evaluation Module User Guide

BOM

Figure 6: Bill of materials

The product information and specifications are subject to change without prior notice. RECOM products are not authorized for use in safety-critical applications (such as life support) without RECOM’s explicit written

consent. A safety-critical application is defined as an application where a failure of a RECOM product may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The buyer

shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized use of RECOM products in such safety-critical applications.