MFL2805S INTERPOINT [Interpoint Corporation Company], MFL2805S Datasheet

MFL2805S

Manufacturer Part Number

MFL2805S

Description

Parallel operation with current share, 16 to 40 VDC input

Manufacturer

INTERPOINT [Interpoint Corporation Company]

Datasheet

1.MFL2805S.pdf (13 pages)

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MFL2805S

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BOSTOCK HK LIMITED

Part Number:

MFL2805S/883

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INTERSIL

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Bonase Electronics (HK) Co., Limited

Part Number:

MFL2805S/883 5962-9316301HXC

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Crane Aerospace & Electronics

Electronics Group (Interpoint Brand)

PO Box 97005 • Redmond WA 98073-9705

425.882.3100 • power@crane-eg.com

www.craneae.com/interpoint

Features

description

The MFL Series™ 28-volt DC/DC converters are rated up to 65

watts of output power over a -55°C to +125°C temperature range

with a 28 VDC nominal input. On dual output models up to 70%

of the rated output power can be drawn from either the positive

or negative output. Current sharing allows the units to be paral-

leled for total power of up to 148 watts. The welded, hermetically

sealed package is only 3.005 x 1.505 x 0.400 inches, giving

the series an overall power density of up to 43 watts per cubic

inch. The converters are offered with standard screening, “ES”

screening, or fully compliant to “883” MIL-PRF-38534 Class H

screening. Standard microcircuit drawings (SMD) are available.

The MFL Series converters are switching regulators that use a

quasi-square wave, single ended forward converter design with a

constant switching frequency of 600 kHz.

Isolation between input and output circuits is provided with a

transformer in the forward path and a wide bandwidth magnetic

coupling in the feedback control loop. The MFL uses a unique

dual loop feedback technique that controls output current with

an inner feedback loop and an output voltage with a cascaded

voltage mode feedback loop.

The additional secondary current mode feedback loop improves

transient response in a manner similar to primary current mode

control and allows for ease of paralleling, but without the cost

and complexity.

The constant frequency, pulse-width modulated converters use a

quasi-square wave single-ended forward design. Tight load regu-

lation is achieved through a wide-bandwidth magnetic feedback

circuit. The output on single MFL models can be trimmed (see

Figure 1 for voltage changes with different resistor values).

esign

Parallel operation with current share,

up to 3 units (148 watts)

•

-55° to +125°C operation

16 to 40 VDC input

50 V for 120 ms transient protection

Fully isolated, magnetic feedback

Fixed high frequency switching

Remote sense or output trim on

single output models

Inhibit function

Sync in and Sync Out

Indefinite short circuit protection

High power density, 87% efficiency

eatures

MFL single and dual dc/dc converters

28 VoLt input – 65 Watt

MFL Rev E - 20101026

Page 1 of 13

The MFL Series converters have two inhibit terminals (INH1 and

INH2) that can be used to disable power conversion, resulting in

a very low quiescent input current and no generation of switching

noise. A logic low (<0.8 volts) is required to inhibit the converter

between INH1 (pin 4) and Input Common (pin 2). A logic low

(<0.5 volts) is required to inhibit the converter between INH2 (pin

12) and Output Common (pin 8). The application of intermediate

voltages to these pins (1.5 to 10.5 volts) should be avoided.

Converters may be synced to an external clock (525 to 675 kHz)

or to one another by using the sync in or out pins. The nominal

free-run switching frequency is 600 kHz (see Application Note on

Inhibit and Synchronization).

Multiple MFL converters may be used in parallel to drive a

common load (see Figure 2). In this mode of operation the load

current is shared by two or three MFL converters. In current

sharing mode, one MFL converter is designated as a master.

The SLAVE pin (pin 11) of the master is left unconnected and

the MSTR/INH2 pin (pin 12) of the master is connected to the

SLAVE pin (pin 11) of the slave units. The units designated as

slaves have the MSTR/INH2 pin (pin 12) connected to the SNS

RTN pin (pin 9). Figure 2 shows the typical setup for two or

three units in parallel. Note that synchronizing the units together

(though shown in the figure) is not required for current sharing

operation. A second slave unit may be placed in parallel with a

master and slave; this requires the TRI pin (pin 3) of the master

unit to be connected to the SNS RTN pin (pin 9).

When paralleled, 76% of the total combined power ratings of the

MFL converters are available at the load. Overload and short

circuit performance are not adversely affected during parallel

operation

nhibit

ync

urrent anD

Crane Aerospace & Electronics Power Solutions

arallel

PeratiOn

single

available upon request,

including 2 V, 8 V and

Other output voltages

3.3

VDc O

MODELS

54 V single.

utPut

Dual

±12

±15

±5

Related parts for MFL2805S

MFL2805S Summary of contents

Page 1

MFL single and dual dc/dc converters Features Parallel operation with current share units (148 watts) • -55° to +125°C operation • VDC input • for 120 ms transient protection • Fully isolated, ...

MFL single and dual dc/dc converters Operating COnditiOns and CharaCteristiCs input Voltage range • VDC continuous • for 120 msec transient output power • watts depending on model Lead soldering temperature (10 ...

Page 3

MFL single and dual dc/dc converters sinGLe output ModeLs connection diaGraMs - sense and paraLLeL 28V Inhibit Sync In 28V Inhibit Sync In F igure 28V Inhibit Sync In www.craneae.com/interpoint 28 VoLt input – 65 Watt 1 Positive Input MSTR/INH2 ...

Page 4

MFL single and dual dc/dc converters pin out pin single output dual output 1 Positive Input Positive Input 2 Input Common Input Common 3 Triple (TR1) Triple (TR1) 4 Inhibit 1 (INH1) Inhibit 1 (INH1) 5 Sync Out Sync Out ...

Page 5

... Page MFL Rev E - 20101026 Crane Aerospace & Electronics Power Solutions sMd nuMbers STANDARD MFL SERIES MICROCIRCUIT SIMILAR PART DRAWING (SMD) 5962-0621301HXC MFL283R3S/883 5962-9316301HXC MFL2805S/883 5962-9316201HXC MFL2812S/883 5962-9316101HXC MFL2815S/883 5962-9319101HXC MFL2805D/883 5962-9319201HXC MFL2812D/883 5962-9319301HXC MFL2815D/883 For exact specifications for an SMD product, refer to the SMD drawing ...

Page 6

... Transition time 100 µs ±20%. 5. Tested on release from inhibit. 6. Shall not compromise DC performance. Page MFL Rev E - 20101026 Crane Aerospace & Electronics Power Solutions MFL2805S MFL2812S min tyP maX min tyP 4.87 5.00 5.13 11.76 12.00 0 — — ...

Page 7

MFL single and dual dc/dc converters Electrical Characteristics: –55°C to +125° SINGLE OUTPUT MODELS Parameter OutPut VOltage OutPut current OutPut POWer OutPut riPPle line regulatiOn lOaD regulatiOn inPut VOltage nO ...

Page 8

MFL single and dual dc/dc converters Electrical Characteristics: –55°C to +125° DUAL OUTPUT MODELS Parameter cOnDitiOns OutPut VOltage 3 OutPut current each OutPut VDc tOtal OutPut OutPut POWer ...

Page 9

... Output Power (Watts) MFL2815S & MFL2815D Efficiency F 6 igure Vout Vin 50 µs/div MFL2805S Step Line Response F 9 igure Vin +Vout –Vout 50 µs/div MFL2815D Step Line Response F 12 igure ...

Page 10

... Typical Performance Curves: 25° VDC Vin, 100% load, free run, unless otherwise specified. 50% to 100% –Pout = 32.5W 100% to 50% 1ms/div MFL2815D Step Load Response F 13 igure 16 MFL2815S & 15D MFL2805S & MFL2812S & 12D Output Power (Watts) Low Line Dropout F ...

Page 11

MFL single and dual dc/dc converter cases Angled corner indicates pin one. 1.505 (38.23) max. 1.380 (35.05) 1.250 (31.75) 1.050 (26.67) 0.850 (21.59) 0.650 (16.51) 0.450 (11.43) 0.250 (6.35) 0.120 (3.05) 0.000 Case dimensions in inches (mm) Tolerance ±0.005 (0.13) ...

Page 12

MFL single and dual dc/dc converters S TANDARD AND COmpOnent-level test perFOrmed Element Electrical (probe) Element Visual Internal Visual Final Electrical Wire Bond Evaluation SLAM™/C-SAM: Input capacitors only (Add’l test, not req Notes: 1. Standard and /ES, non-QML ...

Page 13

MFL single and dual dc/dc converters S TANDARD AND P RODUCT test perFOrmed Pre-cap Inspection Method 2017, 2032 Temperature Cycle (10 times) Method 1010, Cond. C, -65°C to 150°C, ambient Method 1010, Cond. B, -55°C to 125°C, ambient Constant Acceleration ...

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