Linear Technology DC1584A Manuale utente

DESCRIPTION

Demonstration Circuit DC1584A is a Simple Low-Iq Battery Charger/Protector With NTC Thermistor featuring the

LTC®4070EDDB.

PERFORMANCE SUMMARY

Specifications are at T

= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VBUS

Input voltage R

LIMIT

= 169

Ω

10 12 16 V

V(BAT)

Battery Float Voltage ‘VFLOAT’ jumper on 4.1V, Constant Voltage

Mode. T

NTC

= 25°C

4.059 4.141 V

I(BAT)

Battery Charge Current Constant Current Mode, Vin = 12V, VCC =

3.8V

49.7 mA

QUICK START PROCEDURE

Refer to Figure 1 for the proper measurement

equipment setup and jumper settings and follow the

procedure below.

NOTE.

When measuring the input or output voltage ripple, care

must be taken to avoid a long ground lead on the oscilloscope

probe. Measure the input or output voltage ripple by touching the

probe tip directly across the VBUS or Vcc and GND terminals. See

Figure 2 for proper scope probe technique.

1. Set PS1 = 12V, PS2 = 3.6V, “VFLOAT” (JP2) to

4.1V. Observe I(VBUS) (AM1). The voltage on

the battery is below the LTC4070EDDB’s float

voltage. So all the current is flowing into the bat-

tery, and that current is (12V – 3.6V) /169(R1) =

49.7mA.

2. If “LBO” LED lit, decrease PS2 until off. Observe

BAT (VM2). The LBO output goes high when the

battery voltage is below 3.2V, but it has 200-

300mV of hysteresis. So it may not go low until

3.5V, with Vcc ↑.

3. Increase PS2 until LBO is lit. Observe BAT

(VM2).

4. Increase PS2 until HBO lit. Observe BAT (VM2).

The HBO LED will light when the battery voltage

is within ~50mV of the float voltage.

5. Disconnect PS2, AM2, and 3.6Ωresistor. Ob-

serve BAT (VM2). The only limit to the Vcc volt-

age now is the LTC4070, so the voltage will rise

to the float voltage.

6. Reset the Jumpers to their default position.

QUICK START GUIDE FO

DC1584

LTC4070EDDB: Simple Low-Iq

Battery Charger/Protecto

With NTC Thermistor Input

Downloaded from Arrow.com.

LTC4070EDDB

Figure 1. Proper Measurement Equipment Setup for DC1584A

VIN

GND

Figure 2. Measuring Input or Output Ripple

PS1 +

4.35V - 5.5V supply

1A -

VM1 + PS2

0V - 5V supply

- 1

3.6

Ω

VM2

AM2

+ -

AM1

Note: All connections from equipment should be Kelvin connected directly to the board

pins which they are connected on this diagram and any input or output leads should be

twisted pair.

Downloaded from Arrow.com.Downloaded from Arrow.com.

LTC4070EDDB

FDN352AP

3 2

EXT

200

0.22uF

25V

0805

VFLOAT

1uF

0603

25V

10 %

LBO

Charging

OPT

VIN

OFF

Charged

HBO

1 2

DC1584A

Wednes day , Nov em ber 04, 2009

G. Barbehenn

LTC4070EDDB: SIMPLE LOW - Iq BATTERY

CHARGER / PROTECTOR WITH NTC THERMISTOR INPUT

SIZE

DATE:

DWG NO. REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

DRAWN:

CHECKED:

APPROVED:

ENGINEER:

DESIGNER:

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blv d.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIB ILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

JP4

HBO LED

4.0V

JP7

SHUNT

JP2

ON 25 mils clearance

R10

1.0

5 %

HBO

GND

5 %

LBO LED

ON OFF

Charged

LTC4070EDDB

ADJ

NTCB IA S

HBO

LBONTC GND

DRV

VCC

GND

169

2512

1 %

JP1

OPT

10k

JP6

JP3

OPT

75mA

OPT

DF3-3P-2DSA

BAT

GND

ENTC

25 mi ls clearance

4.2V

OPT

GND

25 mi ls clearance

R11

1.0

5 %

100uF

6.3V

1206

20 %

NTC

OFF

1.0

5 %

LBO

25 mi ls clearance

JP5

Unless noted:

Resistors: Ohms, 0402, 1%, 1/16W

Capacitors: uF, 0402, 10%, 50V

OPT

NJC

PRODUCTION RELEASEA 10/15/09

REVISION HISTORY

DESCRIPTION DATEA PPROV EDECO REV

NTC

BAT

Charging

10V - 15V

VBUS

5 %

INT

4.1V

Figure 3. Schematic

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

LTC4070EDDB

Figure 4. Bill of Materials

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

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