DC1635A Datasheet DC1635A | P1-P3

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DEMO MANUAL DC1635A

DESCRIPTION

LTC4412/LTC4414:

Dual Low Loss High Voltage

PowerPath Controllers

Demonstration circuit 1635A features the LTC

4412HVIS6

and LTC4414EMS8, low loss PowerPath™ controllers. Each

controller is capable of automatically switching between

primary and auxiliary power sources for a single output.

There are two electrically isolated circuits, one for each IC,

for independent evaluation. The LTC4412 circuit is intended

for lower current loads, while the LTC4414 circuit is capable

of driving larger PMOS devices for higher current loads.

The input supply voltage ranges are from 2.5V to 36V for

LTC4412 and 5V to 36V for LTC4414. As initially conﬁgured

with the default MOSFET, the LTC4412 circuit maximum

input voltage is 18V. The LTC4412 and LTC4414 circuit

current limits are 2A and 8A respectively.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

PERFORMANCE SUMMARY

The primary power paths can be controlled with external

logic applied to the CTL pins. PowerPath status can be

monitored using the STAT pins. Evaluation of higher current

or more complex sourcing systems can be accomplished

by installing additional ICs, as well as paralleling the inputs

and/or outputs using the optional supplied pads. Multiple

standard MOSFET package options are also available on

each circuit for evaluation convenience.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo/DC1635A

PARAMETER CONDITIONS VALUE UNIT

Minimum LTC4412 Input Voltage V

IN1

2.5 V

Maximum LTC4412 Input Voltage V

IN1

and V

AUX1

18 V

LTC4412 Maximum Current MOSFET Limited 2 A

Minimum LTC4414 Input Voltage V

IN2

and V

AUX2

5 V

Maximum LTC4414 Input Voltage V

IN2

and V

AUX2

36 V

LTC4414 Maximum Current MOSFET Limited 8 A

Speciﬁcations are at T

= 25°C

dc1635afc

DEMO MANUAL DC1635A

QUICK START PROCEDURE

Demonstration circuit 1635A is easy to set up to evaluate

the performance of LTC4412 and LTC4414. Refer to Figure

1 for proper measurement equipment setup of both circuits

and follow the procedures below.

LTC4412 Circuit

1. With all power off, connect auxiliary (V

AUX1

) and primary

IN1

) power supplies capable of 2A each, the system

load and meters as shown in Figure 1.

2. Preset the system load to 0A and the input supplies to

0V, 0A current limit.

3. Connect the system load to the output terminals, V

OUT1

and GND1.

4. Turn on the supplies, setting the current limit up to 2A.

Adjust the voltages to the desired value, up to 18V. The

higher voltage of the two supplies should appear at the

output.

5. Turn the load on and adjust as necessary.

6. Adjust the supplies and observe how the output switches

over to follow the higher voltage of the two sources.

LTC4414 Circuit

1. With all power off, connect auxiliary (V

AUX2

) and primary

IN2

) power supplies capable of 8A each, the system

load, and meters as shown in Figure 1.

2. Preset the system load to 0A and the input supplies to

0V, 0A current limit.

3. Connect the system load to the output terminals, V

OUT2

and GND2.

4. Turn on the supplies, setting the current limit up to 8A.

Adjust the voltages to the desired value, up to 36V. The

higher voltage of the two supplies should appear at the

output.

5. Turn the load on and adjust as necessary.

6. Adjust the supplies and observe how the output switches

over to follow the higher voltage of the two sources.

Optional

7. For improved current handling, install additional MOS-

FETs, select from different package footprints, or shunt

the two circuits at V

, V

OUT

and GND.

8. For source-load back-to-back isolation, remove jumpers

JMP1 and JMP2, and/or JMP3 and JMP4, then install

additional MOSFETs back-to-back as shown in Figure2.

9. For external control of the primary source power path,

remove the 0Ω jumper on the CTL1 or CTL2 pin, R2 or

R5 respectively. Apply the logic-control signal on CTL1

or CTL2 as necessary.

dc1635afc

DEMO MANUAL DC1635A

QUICK START PROCEDURE

Figure 1. Test Setup of DC1635A

DC1635 F01

SYSTEM

LOAD 1

–

PRIMARY

SUPPLY 1

LTC4412

CIRCUIT

–

PRIMARY

SUPPLY 2

–

LTC4414

CIRCUIT

SYSTEM

LOAD 2

–

AUXILIARY

SUPPLY 1

–

AUXILIARY

SUPPLY 2

–

P1-P3 P4-P6 P7-P9 P10-P10

DC1635A

Mfr. #:

Buy DC1635A

Manufacturer:

Analog Devices Inc.

Description:

Power Management IC Development Tools LTC4412 / LTC4414 Demo Board ? VIN1=2.5V

Lifecycle:

New from this manufacturer.

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