DC1902B Datasheet DC1902B | P1-P3

dc1902bfa

DEMO MANUAL DC1902B

Description

LT4320

Ideal Diode Bridge Controller

Demonstration circuit 1902B features the ideal diode bridge

controller LT

4320 suitable for applications that require

low to medium current AC to DC full-wave rectification

or DC polarity correction and a small compact solution

(see Table 2).

The LT4320 drives four N-channel MOSFETs to perform

full-wave rectification functionally similar to a diode bridge

but with much lower power dissipation. This topology eases

thermal design, and increases usable output voltage. In

addition, an all N-channel topology has benefits over a

P-channel topology such as a wider selection of MOSFETs,

lower cost, lower R

DS(ON)

, and smaller footprint.

Only a few essential components are required to oper-

ate the

LT4320 as an ideal diode bridge: four N-channel

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

Technology Corporation. All other trademarks are the property of their respective owners.

performance summary

MOSFETs, a bypass ceramic capacitor, and an AC smooth-

ing capacitor (

LOAD

). The DC1902B includes low R

DS(ON)

N-channel MOSFETs (10mΩ typical) to support low to

medium current applications. When an AC voltage source

is used, the onboard C

LOAD

(C2) capacitor allows for up

to 1.5A of average output current. Add additional C

LOAD

capacitance to support higher current AC applications. A

unidirectional TVS (D1) is included to protect the applica

tion from brief overvoltage events up to the part rating. A

footprint for bidirectional TVS (D2) is also included and is

recommended for electrically harsh conditions.

Design files for this circuit board are available at

http://www.linear.com/demo

DC INPUT VOLTAGE (V) DC OUTPUT VOLTAGE (V) DC LOAD CURRENT (A) EFFICIENCY (%) (TYPICAL)

12.046 11.977 3.500 99.43

20.045 19.972 3.500 99.64

40.025 39.952 3.500 99.82

Table 1. DC Efficiency of the DC1902B at Various Input Voltages

dc1902bfa

DEMO MANUAL DC1902B

Quick start proceDure

1. Connect a DC or AC power supply to VIN1 and VIN2 in

any polarity as shown in Figure 1. Make sure the output

voltage of the DC or AC power supply is within the input

voltage range of the DC1902B as shown in Table 2.

2. Connect a load and a voltmeter across VOUT+ to VOUT–

as shown in Figure 1.

3. For a DC input, raise the output voltage of the DC power

supply to the desired level. Check the DC1902B output

voltage across VOUT+ to VOUT–. The reading should

be very close to the input voltage of the DC1902B.

4. For an AC input, raise the output voltage of the AC power

supply to the desired level. Make sure the load current

is within the current limits as shown in Table 2 with the

demo board supplied C

LOAD

(C2). Add additional C

LOAD

capacitance, if higher output load current is desired. With

an oscilloscope in place of the output voltmeter, make

sure the lowest point of the output voltage (droop) is

above the minimum operating voltage specified in the

LT4320 data sheet.

Note: Maximum load current with an AC input should be

limited to about 3A due

to MOSFET and PCB limitations.

Figure 1. DC1902B Setup

VOLTAGE SOURCE INPUT VOLTAGE MAXIMUM LOAD CURRENT

DC 9VDC to 60VDC 3.5A

AC, 60Hz 12VAC

RMS

0.7A*

AC, 60Hz 24VAC

RMS

1.5A*

*Limited by demo board supplied C2.

Table 2. Maximum Load Current per Input Voltage and Type of Voltage Source

dc1902bfa

DEMO MANUAL DC1902B

thermal plot

Figure 2. Ideal Diode Bridge Using Four PSMN011-60MS vs Diode Bridge Using Four B360B Passing 3ADC

(VIN1 Positive with Respect to VIN2)

P1-P3 P4-P6

DC1902B

Mfr. #:

Buy DC1902B

Manufacturer:

Analog Devices Inc.

Description:

Power Management IC Development Tools LT4320IDD Demo Board - 200W Ideal Diode

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

DC1902B