24D5.1700NT [ETC]

Analog IC ; 模拟IC\n


型号：	24D5.1700NT
厂家：	ETC
描述：	Analog IC 模拟IC\n 模拟IC 输出元件
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20 Watt NT Dual Series DC/DC Converters

Features

Fully Self Contained, No External Parts

Required for Operation

Low and Specified Input/Output Capacitance

Efficiencies to 85%

Overcurrent Protected and Thermal Shutdown

Circuitry for Long, Reliable Operation

Five Sided Shielded Low Thermal Gradient

Copper Case

Five Year Warranty

Water Washable Case Design

Description

Selection Chart

Designed to save valuable PC board space, the 20 Watt NT

Dual series is ideal for use in battery operated industrial,

medicalcontrolandremotedatacollectionsystems. Eachunit

is completely filtered to reduce noise, has an exceptionally

low input/output capacitance and provides efficiencies to

85%.

Input Range

VDC

Output

VDC

Output

Model

Min

Max

12D5.1700NT

12D12.850NT

12D15.700NT

24D5.1700NT

24D12.850NT

24D15.700NT

48D5.1700NT

48D12.850NT

48D15.700NT

±5

±12

±15

±5

1700

850

700

Complete overload protection with independent pulse-by-

pulse current limiting and an overtemperature shutdown

circuit ensure zero-failure rate operation. Their copper cases

are five-sided, shielded and water washable.

1700

850

±12

±15

±5

700

72 *

1700

850

±12

±15

700

UL Recognition only applies up to 60 VDC

20 Watt NT Dual Series Block Diagram

2401 Stanwell Drive

•

Concord, California 94520

•

Ph: 925/687-4411 or 800/542-3355

•

Fax: 925/687-3333

•

www.calex.com

•

Email: sales@calex.com

eco: 010403-2

20 Watt NT Dual Series DC/DC Converters

Input Parameters*

Model

12D5.1700NT 12D12.850NT 12D15.700NT 24D5.1700NT 24D12.850NT 24D15.700NT

Units

MIN

MAX

9.0

18.0

36.0

Voltage Range

VDC

Reflected Ripple (1)

TYP

350

100

140

mA P-P

mA RMS

Input Current No Load

Full Load

TYP

1750

2170

2210

875

1010

1030

Efficiency

TYP

Switching Frequency

220

kHz

Maximum Input

Overvoltage,

100 ms maximum

Turn-on Time,

1% Output Error

MAX

TYP

VDC

Recommended Fuse

(2)

AMPS

Model

48D5.1700NT

48D12.850NT

48D15.700NT

Units

MIN

MAX

36.0

72.0 *

Voltage Range

VDC

Reflected Ripple (1)

TYP

mA P-P

mA RMS

Input Current No Load

Full Load

TYP

440

505

520

Efficiency

TYP

Switching Frequency

220

kHz

Maximum Input

Overvoltage,

100 ms maximum

Turn-on Time,

1% Output Error

MAX

TYP

VDC

Recommended Fuse

(2)

AMPS

UL Recognition only applies up to 60 VDC

Output Parameters*

12D5.1700NT

24D5.1700NT

48D5.1700NT

12D12.850NT

24D12.850NT

48D12.850NT

12D15.700NT

24D15.700NT

48D15.700NT

Model

Units

VDC

Output Voltage

Output Voltage Accuracy

±5

±12

±15

MIN

TYP

MAX

TYP

MAX

MIN

MAX

TYP

MAX

4.95

5.00

5.05

11.90

12.00

12.10

< 0.5

1.0

0.0

0.85

0.1

0.6

14.90

15.00

15.10

Output Balance

Plus to Minus Output, Full Load

0.0

1.7

0.3

0.7

0.0

0.7

0.2

0.6

Rated Load Range

Load Regulation (12)

Cross Regulation (13)

TYP

2.5

1.0

Line Regulation

Vin = Min-Max VDC

TYP

MAX

< 0.1

0.8

< 0.2

0.8

< 0.2

0.8

Short Term Stability (5)

TYP

< 0.05

%/24Hrs

Long Term Stability

TYP

< 0.2

100

120

> 40

%/kHrs

µs

Transient Response (6)

Dynamic Response (7)

Input Ripple Rejection (8)

Noise, 0-20MHz bw (1)

RMS Noise, 0.01-1 MHz bw

100

Output never exceeds 1%

100

mV peak

TYP

mV P-P

mV RMS

TYP

MAX

150

Temperature Coefficient

ppm/°C

Short Circuit Protection to

Common for all Outputs

Continuous, Current Limit and Thermal Protection

2401 Stanwell Drive

•

Concord, California 94520

•

Ph: 925/687-4411 or 800/542-3355

•

Fax: 925/687-3333

•

www.calex.com

•

Email: sales@calex.com

eco: 010403-2

20 Watt NT Dual Series DC/DC Converters

General Specifications*

All Models

Units

ON/OFF Function

ON Logic Level

MIN

> 1.6

< 0.7

VDC

or Leave Pin Open

OFF Logic Level

or Tie Pin to -Input

MAX

Open Circuit Voltage

Input Resistance

TYP

2.5

VDC

kohms

Converter Idle Current

ON/OFF Pin Low

12S Models

TYP

24S and 48S Models

Isolation (3)

Breakdown Voltage

Input to Output 12D, 24D MIN

Input to Output 48D

10 µA Leakage

BOTTOM VIEW

SIDE VIEW

700

1544

VDC

MIN

Mechanical tolerances unless otherwise noted:

X.XX dimensions: ±0.020 inches

Input to Output

Capacitance

TYP

500

X.XXX dimensions: ±0.005 inches

Output Trim Function

Trim Range

Function

ON/OFF

-INPUT

+INPUT

+OUTPUT

CMN

MIN

±5

Input Resistance

Environmental

kohms

Case Operating Range

No Derating

MIN

MAX

MIN

MAX

MIN

-40

-50

100

-55

105

°C

Case Functional Range (10)

Storage Range

-OUTPUT

TRIM

MAX

Thermal Shutdown

Case Temperature

Thermal Impedance (11)

General

TYP

105

9.5

°C

side effects, however sustained operation at the high

functional temperature will reduce expected operational life.

The data sheet specifications are not guaranteed over the

functional temperature range.

°C/Watt

Unit Weight

TYP

2.3

(11) Thecasethermalimpedanceisspecifiedasthecasetemperature

rise over ambient per package watt dissipated.

Chassis Mounting Kit

Agency Approvals

MS8

UL1950, see note

(12) Loadregulationisdefinedasthevoltagechangeoneitheroutput

as the loads on both outputs are changed from 25% to 100% full

load at the same time.

Note: On nominal 48Vin models UL recognition only applies up to 60 VDC

(13) Cross regulation is defined as the change in one output when the

other output is changed from 25% to 100% full load.

NOTES

All parameters measured at Tc=25°C, nominal input

voltage and full rated load unless otherwise noted.

(14) Specifications subject to change without notice.

Refer to the CALEX Application Notes for the definition

of terms, measurement circuits and other information.

Applications Information

(1) NoiseismeasuredperCALEXApplicationNotes.Measurement

bandwidth is 0-20 MHz for peak-peak measurements, 10 kHz

to 1 MHz for RMS measurements. Output noise is measured

with a 0.01µF ceramic in parallel with a 1µF tantalum located

1" away from the converter to simulate your boards standard

decoupling. Input reflected ripple is measured into a 1 µH

source impedance.

The 20 Watt NT Dual series like all CALEX converters carries

the full 5 year CALEX no hassle warranty. We can offer a five

year warranty where others can’t because with CALEX it’s

rarely needed.

General Information

(2) To determine the correct fuse size, see CALEX Application

Notes.

The 20 Watt NT Dual series is mindful of battery operation for

industrial, medical control and remote data collection

applications. The remote ON/OFF pin places the converter in

a very low power mode that draws typically less than 3 mA

from the input source.

(3) The Case is tied to the -Input pin.

(5) Short term stability is specified after a 30 minute warmup at full

load, constant line and recording the drift over a 24 hour period.

(6) The transient response is specified as the time required to settle

from a 50 to 75 % step load change on one output (rise time of

step = 2 µSec) to a 1% error band.

Full overload protection is provided by independent pulse-

by-pulse current limiting and an over-temperature shutdown

circuit. These protection features assure you that our 20 Watt

Dual will provide you with zero failure rate operation.

(7) Dynamic response is the peak overshoot during a transient as

defined in note 6 above.

(8) The input ripple rejection is specified for DC to 120 Hz ripple with

a modulation amplitude of 1% of Vin.

A fully five sided shielding, sealed, water washable case is

standardalongwithspecifiedoperationoverthefullcommercial

temperature range of -40 to +90°C.

(10) Thefunctionaltemperaturerangeisintendedtogiveanadditional

data point for use in evaluating this power supply. At the

low functional temperature the power supply will function with no

2401 Stanwell Drive

•

Concord, California 94520

•

Ph: 925/687-4411 or 800/542-3355

•

Fax: 925/687-3333

•

www.calex.com

•

Email: sales@calex.com

eco: 010403-2

20 Watt NT Dual Series DC/DC Converters

General Operation

Applying The Input

Figure 1 shows the recommended connections for the 20

Watt NT Dual DC/DC converter. A fuse is recommended to

protect the input circuit and should not be omitted. The fuse

serves the purpose of preventing unlimited current from

flowing in the case of a catastrophic system failure.

Figure 2.

For very low noise applications the circuits shown above can be

used. The input current ripple will be reduced approximately 30 dB

of the original value while the output noise will be reduced to below

10 mV P-P.

D - Overvoltage clamp is optional, see text

- No connection needed if not used.

Figure 1.

Standard connections for the 20 Watt NT Dual. The ON/OFF and

TRIM pins can be left floating if they are not used. The input fuse

should not be omitted. The overvoltage diodes may be added to the

circuit directly at the converter to provide transient protection to your

circuit.

Figure 3.

The output can be trimmed by either a trimpot or fixed resistors. If

fixed resistors are used their values may range from 0 to infinite

ohms. The trimpot should be 20 K ohms nominal.

The ON/OFF and TRIM pins may be left floating if they are

not used. No external capacitance on either the input or

outputsisrequiredfornormaloperation, infactitcandegrade

the converters performance. See our application note

“Understanding DC/DC Converters Output Impedance” and

the low noise circuits later in this data sheet for more

information. The usual 1 µF to 10 µF tantalum and 0.1 to

0.001 µF ceramic bypasses may be used around your PCB

as required for local bypassing without harm.

Non Standard Output Voltages/Single

Ended Mode

The trim may be used to adjust a +5 output unit up to 5.2 volts

for ECL applications or to make up for line voltage drops. +5

output units will trim around a range of approximately +4.2 to

+5.3 volts.

+12 volt units will trim around a range of approximately

+7.4 to +12.9 volts and +15 volt units will trim around a range

Extremely low ESR capacitors (< 0.5 ohms) should not be

used at the input as this will cause peaking of the input filters

transferfunctionandactuallydegradethefiltersperformance.

of approximately +8.6 to +16 volts.

The dual outputs may also be used single-ended to get

10, 24 or 30 volts output at the full rated current of 1.7, 0.85

or 0.7 Amps (see figure 4). To use the single ended mode just

connect your load to the + and - output terminals and leave

the CMN output floating. Trimming of the output voltage may

also be done while using the outputs in the single ended

mode.

Applying The Output

The output is simply connected to your application circuit and

away you go. If extra low output noise is required in your

application the circuit shown in Figure 2 may be used to

reduce the output noise to below 10 mV peak-peak.

Maximumpowerfromthemoduleislimitedtothespecified

non-trimmed maximum (Typical Output Voltage x Maximum

Rated Load = Maximum Power). Trimming the output up

reducestheoutputcurrentproportionallytokeepthemaximum

power constant. Output current is not increased over the

Rated Maximum when trimming the output voltage down.

The trim pin may be used to adjust the outputs by up to +5

% from the nominal factory setting to account for system

wiring voltage drops. Figure 3 shows the proper connections

to use the trim pin. If output trimming is not desired the trim pin

may be safely left floating.

See our application note on remote sense and trim

functions for more information.

2401 Stanwell Drive

•

Concord, California 94520

•

Ph: 925/687-4411 or 800/542-3355

•

Fax: 925/687-3333

•

www.calex.com

•

Email: sales@calex.com

eco: 010403-2

20 Watt NT Dual Series DC/DC Converters

Operation

The remote ON/OFF pin may be left floating if this function is

not used. The equivalent input circuit for the ON/OFF pin is

shown in figure 5. The best way to drive this pin is with an open

collector/drain or relay contact. See our application note titled

“Understanding the remote ON/OFF function” for more

information about using the remote ON/OFF pin.

Figure 4.

To get 10, 24 or 30 volt outputs use the NT dual in the “Single Ended”

mode. In this mode the load is taken across the + to - pins with the

CMN pin left floating. Output Current in this mode is the full rated 1.7,

0.85 or 0.7 Amps. Output trimming may optionally be used as shown

in figure 3.

Figure 5.

The simplified schematic of the NT Dual series ON/OFF pin. The

input impedance is approximately 20 kohms. The open circuit

voltage is approximately 2.5 volts. By leaving this pin floating the

converter will be in the ON state. When the pin is pulled below 0.7

volts the converter is placed in the power down or OFF state. See

our application note on the remote ON/OFF function for more

information.

Grounding

The input and output sections are fully floating from each

other. They may be operated fully floating or with a common

ground. If the input and output sections are connected either

directly at the converter or at some remote location from the

converter it is suggested that a 1 to 10µF, 0.5 to 5 ohm ESR

capacitor bypass be used directly at the converter output pins.

Thiscapacitorpreventsanycommonmodeswitchingcurrents

from showing up at the converters output as normal mode

output noise. Do not use the lowest ESR, biggest value

capacitor that you can find! This can only lead to reduced

system performance or oscillation. See our application note

“UnderstandingOutputImpedanceForOptimumDecoupling”

for more information.

When the ON/OFF pin is pulled low with respect to the -

Input, the converter is placed in a low power drain state. When

the ON/OFF pin is released the converter fully powers up in

typically 10 milliseconds. The ON/OFF pin turns the converter

off while keeping the input bulk capacitor fully charged, this

prevents the large inrush current spike that occurs when the

+input pin is opened and closed.

Temperature Derating

Another useful “Trick” that can be used when operating

withacommongroundistousea10to100µHchokebetween

the grounds. This gives you a solid low frequency ground

connection, but looks like a high impedance to the switching

current effects and prevents them from flowing in the

connection. Thiswillhavetheeffectofpreventingthecommon

mode currents from showing up as normal mode components

in your output or input circuits. Be sure that the “Q” of this

inductor is quite low and that the self resonant frequency is

above 220 kHz. If necessary to keep the inductor “Q” low,

parallel it with a 200 ohm to 1k ohm resistor.

The NT Dual series can operate up to 90°C case temperature

withoutderating.Casetemperaturemayberoughlycalculated

from ambient by knowing that the NT Duals case temperature

rise is approximately 9.5°C per package watt dissipated.

For example: If a 24 volt input converter was delivering 15

Watts, at 24 volts input at what ambient could it expect to run

with no moving air and no extra heatsinking?

Efficiency is approximately 82%, this leads to an input

power of about 18 Watts. The case temperature rise would be

3 Watts x 9.5 = 28.5°C. This number is subtracted from the

maximum case temperature of 90°C to get approximately:

62°C.

Case Grounding

This is a rough approximation to the maximum ambient

temperature. Because of the difficulty of defining ambient

temperature and the possibility that the loads dissipation may

actually increase the local ambient temperature significantly

orthatconvectioncoolingissuppressedbyphysicalplacement

of the module. These calculations should be verified by actual

measurement of operating temperature and your circuits

exact efficiency (efficiency depends on both line input and

load value) before committing to a production design.

The case serves not only as a heat sink but also as a EMI

shield. The 0.016 inch thick copper provides >25 dB of

absorption loss to both electromagnetic and electric fields at

220 kHz, while at the same time providing about 30% better

heat sinking than competitive 0.01 inch thick steel cases.

The case shield is tied to the -Input. This connection is

shown on the block diagram. The case is floating from the

output, coupled only by the 500 pF of isolation capacitance.

2401 Stanwell Drive

•

Concord, California 94520

•

Ph: 925/687-4411 or 800/542-3355

•

Fax: 925/687-3333

•

www.calex.com

•

Email: sales@calex.com

eco: 010403-2

20 Watt NT Dual Series DC/DC Converters

Typical Performance (Tc=25°C, Vin=Nom VDC, Rated Load).

12 VOLT EFFICIENCY Vs. LOAD

LINE = 9VDC

12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE

12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

50% FULL LOAD

100% LOAD

50% LOAD

LINE = 12VDC

LINE = 18VDC

100% FULL LOAD

100

LOAD (%)

LINE INPUT(VOLTS)

LINE INPUT (VOLTS)

24 VOLT EFFICIENCY Vs. LOAD

24 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE

24 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE

2.0

1.5

1.0

0.5

0.0

LINE = 18VDC

100% FULL LOAD

50% FULL LOAD

100% LOAD

50% LOAD

LINE = 24VDC

LINE = 36VDC

LOAD (%)

LINE INPUT(VOLTS)

LINE INPUT (VOLTS)

48 VOLT EFFICIENCY Vs. LOAD

48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE

48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE

1.00

0.75

0.50

0.25

0.00

100% FULL LOAD

LINE = 36VDC

100% LOAD

50% LOAD

50% FULL LOAD

LINE = 48VDC

LINE = 72VDC

LOAD (%)

LINE INPUT(VOLTS)

LINE INPUT (VOLTS)

OUTPUT IMPEDANCE Vs. FREQUENCY

DERATING

120

100

INFINITE HEAT SINK

NO HEAT SINK

↑

←

SAFE OPERATING AREA →

↓

100

1000

10000

100000

1000000

-40

-20

100

FREQUENCY (Hz)

AMBIENT TEMPERATURE (Deg C)

NOTES ON USING THE CURVES

1) The Input currents are for 20 Watts of output power. For ±5 Volt

output models the current is approximately 15% less.

2) The efficiency curves were generated for 12 Volt output models.

To use for other outputs adjust as follows:

±5 Volt outputs.......Subtract approximately 3%

±15 Volt outputs.....Add approximately 1%

2401 Stanwell Drive

•

Concord, California 94520

•

Ph: 925/687-4411 or 800/542-3355

•

Fax: 925/687-3333

•

www.calex.com

•

Email: sales@calex.com

eco: 010403-2

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