JRW040A0A1-H Datasheet JRW040A0A1-H | P13-P15

Data Sheet

JRW017-070 Series Power Modules DC-DC Converters

36-75Vdc Input; 1.2Vdc to 12Vdc Output

Test Configurations

Note: Measure input reflected-ripple current with a simulated source

inductance (LTEST) of 12 µH. Capacitor CS offsets possible battery

impedance. Measure current as shown above.

Figure 43. Input Reflected Ripple Current Test Setup.

Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or tantalum

capacitor. Scope measurement should be made using a BNC socket.

Position the load between 51 mm and 76 mm (2 in. and 3 in.) from the

module.

Figure 44. Output Ripple and Noise Test Setup.

Note: All measurements are taken at the module terminals. When socketing, place

Kelvin connections at module terminals to avoid measurement errors due to socket

contact resistance.

Figure 45. Output Voltage and Efficiency Test Setup.

Design Considerations

Input Source Impedance

The power module should be connected to a low

ac-impedance source. A highly inductive source

impedance can affect the stability of the power module.

For the test configuration in Figure 43, a 100F

electrolytic capacitor (ESR< 0.7 at 100kHz), mounted

close to the power module helps ensure the stability of

the unit. Consult the factory for further application

guidelines.

Output Capacitance

High output current transient rate of change (high di/dt)

loads may require high values of output capacitance to

supply the instantaneous energy requirement to the

load. To minimize the output voltage transient drop

during this transient, low E.S.R. (equivalent series

resistance) capacitors may be required, since a high

E.S.R. will produce a correspondingly higher voltage drop

during the current transient.

Output capacitance and load impedance interact with

the power module’s output voltage regulation control

system and may produce an ’unstable’ output condition

for the required values of capacitance and E.S.R..

Minimum and maximum values of output capacitance

and of the capacitor’s associated E.S.R. may be dictated,

depending on the module’s control system.

The process of determining the acceptable values of

capacitance and E.S.R. is complex and is load-

dependant. GE provides Web-based tools to assist the

power module end-user in appraising and adjusting the

effect of various load conditions and output

capacitances on specific power modules for various load

conditions.

Safety Considerations

For safety-agency approval of the system in which the

power module is used, the power module must be

installed in compliance with the spacing and separation

requirements of the end-use safety agency standard, i.e.,

UL* 60950-1 Recognized, CSA

†

C22.2 No. 60950-3-01

Certified, and EN 60950-1 (VDE

‡

0805): 2001-12 Licensed.

These converters have been evaluated to the spacing

requirements for Basic Insulation per the above safety

standards. For Basic Insulation models (“-B” Suffix), 1500

Vdc is applied from Vi to Vo to 100% of outgoing

production.

For end products connected to –48V dc, or –60Vdc

nominal DC MAINS (i.e. central office dc battery plant), no

further fault testing is required.

Data Sheet

JRW017-070 Series Power Modules DC-DC Converters

36-75Vdc Input; 1.2Vdc to 12Vdc Output

Safety Considerations (continued)

*Note: -60V dc nominal battery plants are not available

in the U.S. or Canada.

For all input voltages, other than DC MAINS, where the

input voltage is less than 60V dc, if the input meets all of

the requirements for SELV, then:

 The output may be considered SELV. Output

voltages will remain within SELV limits even with

internally-generated non-SELV voltages. Single

component failure and fault tests were performed

in the power converters.

 One pole of the input and one pole of the

output are to be grounded, or both circuits are to

be kept floating, to maintain the output voltage to

ground voltage within ELV or SELV limits.

For all input sources, other than DC MAINS, where the

input voltage is between 60 and 75V dc (Classified as

TNV-2 in Europe), the following must be meet, if the

converter’s output is to be evaluated for SELV:

 The input source is to be provided with reinforced

insulation from any hazardous voltage, including the

ac mains.

 One Vi pin and one Vo pin are to be reliably

earthed, or both the input and output pins are to be

kept floating.

 Another SELV reliability test is conducted on the

whole system, as required by the safety agencies, on

the combination of supply source and the subject

module to verify that under a single fault, hazardous

voltages do not appear at the module’s output.

The power module has ELV (extra-low voltage) outputs

when all inputs are ELV.

All flammable materials used in the manufacturing of

these modules are rated 94V-0.

The input to these units is to be provided with a

maximum 20A fast-acting (or time-delay) fuse in the

unearthed lead.

Data Sheet

JRW017-070 Series Power Modules DC-DC Converters

36-75Vdc Input; 1.2Vdc to 12Vdc Output

Feature Descriptions

Remote On/Off

Two remote on/off options are available. Positive logic

remote on/off turns the module on during a logic-high

voltage on the ON/OFF pin, and off during a logic low.

Negative logic remote on/off turns the module off during

a logic high and on during a logic low. Negative logic,

device code suffix "1," is the factory-preferred

configuration. To turn the power module on and off, the

user must supply a switch to control the voltage

between the on/off terminal and the VI (-) terminal

(Von/off). The switch can be an open collector or

equivalent (see Figure 46). A logic low is Von/off = 0 V to

I.2 V. The maximum Ion/off during a logic low is 1 mA.

The switch should maintain a logic-low voltage while

sinking 1 mA. During a logic high, the maximum Von/off

generated by the power module is 15 V. The maximum

allowable leakage current of the switch at Von/off = 15V

is 50 µA. If not using the remote on/off feature, perform

one of the following to turn the unit on:

For negative logic, short ON/OFF pin to VI(-).

For positive logic: leave ON/OFF pin open.

Figure 46. Remote On/Off Implementation.

Overcurrent Protection

To provide protection in a fault output overload

condition, the module is equipped with internal current-

limiting circuitry and can endure current limit for few

seconds. If overcurrent persists for few seconds, the

module will shut down and remain latch-off. The

overcurrent latch is reset by either cycling the input

power or by toggling the on/off pin for one second. If the

output overload condition still exists when the module

restarts, it will shut down again. This operation will

continue indefinitely until the overcurrent condition is

corrected.

An auto-restart option is also available.

Input Undervoltage Lockout

At input voltages below the input undervoltage lockout

limit, the module operation is disabled. The module will

begin to operate at an input voltage above the

undervoltage lockout turn-on threshold.

Overtemperature Protection

These modules feature an overtemperature protection

circuit to safeguard against thermal damage. The circuit

shuts down and latches off the module when the

maximum device reference temperature is exceeded.

The module can be restarted by cycling the dc input

power for at least one second or by toggling the remote

on/off signal for at least one second.

Over Voltage Protection

The output overvoltage protection consists of circuitry

that monitors the voltage on the output terminals. If the

voltage on the output terminals exceeds the over

voltage protection threshold, then the module will

shutdown and latch off. The overvoltage latch is reset by

either cycling the input power for one second or by

toggling the on/off signal for one second. The protection

mechanism is such that the unit can continue in this

condition until the fault is cleared.

Remote sense

Remote sense minimizes the effects of distribution losses

by regulating the voltage at the remote-sense

connections. The voltage between the remote-sense

pins and the output terminals must not exceed the

output voltage sense range given in the Feature

Specifications table i.e.:

[Vo(+) – Vo(-)] – [SENSE(+) – SENSE(-)]  10% of V

o,nom

The voltage between the Vo(+) and Vo(-) terminals must

not exceed the minimum output overvoltage shut-down

value indicated in the Feature Specifications table. This

limit includes any increase in voltage due to remote-

sense compensation and output voltage set-point

adjustment (trim). See Figure 47. If not using the remote-

sense feature to regulate the output at the point of load,

then connect SENSE(+) to Vo(+) and SENSE(-) to Vo(-) at

the module.

Although the output voltage can be increased by both

the remote sense and by the trim, the maximum

increase for the output voltage is not the sum of both.

The maximum increase is the larger of either the remote

sense or the trim. The amount of power delivered by the

module is defined as the voltage at the output terminals

multiplied by the output current. When using remote

sense and trim: the output voltage of the module can be

increased, which at the same output current would

increase the power output of the module. Care should be

taken to ensure that the maximum output power of the

module remains at or below the maximum rated power.

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