Industrial 48v to 5v dc-dc converter XD50-48S5-POC

DC-DC Converters 50W Output 5V XD50-48S5-POC

 

 

Features

Output power: 50W

Wide input range: 36-72VDC

High conversion efficiency:88%

Line regulation to ±1%

Load regulation to ±1%

Fixed operating frequency

Isolation Voltage :1500V

Enable (On/Off) Control

Output over-voltage protection

Output over-load protection

Hiccup mode short circuit protection

Over-temperature protection

Input under-voltage lock-out

 

Product Overview

These DC-DC converter modules use advanced power

processing, control and packaging technologies to provide

the performance, flexibility, reliability and cost effectiveness

of a mature power component. High frequency Active Clamp

switching provides high power density with low noise and

high efficiency.

 

1. Electric Characteristics

Electrical characteristics apply over the full operating range of input voltage, output load (resistive) and base plate

temperature, unless otherwise specified. All temperatures refer to the operating temperature at the center of the base plate.

1.1 Absolute maximum ratings

Parameter	Min	Typ	Max	Units	Notes
Input Voltage			78	Vdc	Continuous, non-operating
			75	Vdc	Continuous, operating
			78	Vdc	Operating transient protection
Isolation voltage			2000	Vdc	IIn to out
Operating Temperature	-55		100	℃	In view of PCB Temperature
Storage Temperature	-55		125	℃
Enable to -Vin Voltage	-2		15	Vdc

 

1.2 Input Characteristics

Parameter	Min	Typ	Max	Units	Notes
Operating input voltage	36	48	72	Vdc	Continuous
Input Surge Withstand			78	Vdc	<100mS
Under-Voltage Lockout		35.5	36.0	Vdc	Turn - On Threshold
	32.5	33.5		Vdc	Turn - Off Threshold
Maximum Input Current		1.6		A	Full Load;36Vdc Input
Efficiency		88		%	Figures 1-2
Dissipation, Standby		2.0	3.5	W	No Load
Disabled Input Current			5	mA	Enable pin low
Recommend External Input Capacitance		100		uF	Typical ESR 0.1-0.2W

 

1.3 Output Characteristics

Parameter	Min	Typ	Max	Units	Notes
Output Voltage Set point	4.95	5.00	5.05	V	Nominal input; No load;25℃
Output Current Range	0.1		10	A	Subject to thermal derating;
Line Regulation		±0.2	±1	%	Low line to high line; full load
Load Regulation		±0.2	±1	%	No load to full load; nominal input
Temperature Regulation		±0.02		% / °C	Over operating temperature range
Current limit		13		A	Output voltage 90% of nominal
Short circuit current	0	10	25	A	Output voltage <250 mV
RMS			50	mVp-p	Nominal input; full load; 20 MHz bandwidth; See Figures 7
Peak-to-Peak			75	mVp-p
Maximum Output Cap.	220		6000	μF	Nominal input; full load
Output Voltage Trim	-8		+10	%	Nominal input; full load; 25°C

 

1.4 Dynamic Response Characteristics

Parameter	Min	Typ	Max	Units	Notes
Change in Output Current (di/dt= 0.1A/us)			250	mV	50% to 75% to 50% Iout max at nominal ambient air temperature; Figure 5
Change in Output Current (di/dt= 1.5A/us)			250	mV	50% to 75% to 50% Iout max at nominal ambient air temperature; Figure 6
Settling Time			300	uS	To within 1% Vout nom.
Turn-on Time		5		mS	Full load; Vout=90% nom. Figure 3
Shut-down fall time		2		mS	Full load; Vout=10% nom. Figure 4
Output voltage overshoot			5	%

 

1.5 Functional Characteristics

Parameter	Min	Typ	Max	Units	Notes
Switching Frequency	180	200	230	KHz	Regulation stage and Isolation stage
Trim(Pin6)					See part 6.2 Voltage Trim(Pin6)
Output Voltage Trim			10	%	Trim Up, Trim Pin to (-) Vout.
	8			%	Trim Down, Trim Pin to (+) Vout.
Enable(ON/OFF)Control(Pin1)					See part 6.1
Enable Voltage Enable Source Current			15	Vdc	Enable pin floating
			1	mA
Enable (On - Off Control) Positive Logic	1.0		15	%	On–Control, Logic high or floating
	-0.5		0.3	%	Off–Control, Logic low

 

1.6 Isolation Characteristics

Parameter	Min	Typ	Max	Units	Notes
Over-Voltage Protection		120		%	Type: Voltage-Limit Mode Minimum load at rated input voltage
Over-Load Protection		120		%	Current–Mode, Pulse by Pulse Current Limit Threshold,(%Rated Load)
Short – Circuit Protection			65	mΩ	Type: Hiccup Mode, Non–Latching, Auto–Recovery,Threshold,Short–Circuit Resistance
Over–Temperature Protection		125		℃	Type: Non–Latching, Auto-Recovery； Threshold, PCB Temperature
		25		℃	Hysteresis

 

1.7 Safety Standard

Parameter	Min	Typ	Max	Units	Notes
Isolation Voltage	1500			Vdc	In to Out
Isolation Resistance	10			MΩ	At 500VDC to test it when atmospheric pressure and R.H. is 90%
Isolation Capacitance		1000		pF

 

 

2. General Characteristics

Parameter	Min	Typ	Max	Units	Notes
Operating Temperature	-55		+100	℃	Extended, base PCB temperature
Storage Temperature	-55		+125	℃	Ambient
Temperature Coefficient			±0.02	%/℃
Humidity	10		95	%R.H.	Relative Humidity, Non - Condensing
Weight		0.88(25)		Oz (g)	Open Frame
MTBF ( calculated )	1			MHrs	TR-NWT-000332; 80% load,300LFM, 40℃ Ta

 

3.Standards Compliance

Parameter	Notes
UL/cUl60950
EN60950
72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)	test on entire assembly; board & plastic components UL94V-0 compliant
IEC 61000-4-2	ESD test, 8kV - NP, 15kV air - NP (Normal Performance)
GR-1089-CORE	Section 7 - electrical safety, Section 9 - bonding/grounding
Telcordia (Bell core) GR-513

·An external input fuse must always be used to meet these safety requirements. Contact Ours for official safety

certificates on new releases or download from the ENARGY CORP. website.

 

4. QUALIFICATION TESTING

Parameter.	# Units	Conditions
Life Test	32	95% rated Vin and load, units at derating point, 1000 hours
Vibration	5	10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
Mechanical Shock	5	100g minimum, 2 drops in x and y axis, 1 drop in z axis
Temperature Cycling	10	-40°C to 100°C, unit temp. ramp 15°C/min., 500 cycles
Power/Thermal Cycling	5	Tolerating = min to max, Vin = min to max, full load, 100 cycles
Design Marginality	5	Tmin-10°C to Tmax+10°C, 5°C steps, Vin = min to max, 0-105% load
Humidity	5	85°C, 85% RH, 1000 hours, 2 minutes on and 6 hours off
Solderability	15 pins	MIL-STD-883, method 2003

·Extensive characterization testing of all ENARGY CORP. Products and manufacturing processes is performed to

ensure that we supply robust, reliable product. Contact factory for official product family qualification document.

··OPTIONS
ENARGY CORP. provides various options for Logic Sense, Pin Length and Feature Set for this family of DC/DC
converters. Please consult the page 10 of this specification sheet for information on available options.

 

5. WORK CURVE&WAVE

Figure 1: Efficiency at nominal output voltage vs. load
current for minimum, nominal, and maximum input voltage
at 25°C.

Figure 2: Power dissipation at nominal output voltage vs.
load current for minimum, nominal, and maximum input
voltage at 25°C.

 

Figure 3: Turn-on transient at full load (resistive load)
(4ms/div).Input voltage pre-applied.
Ch 1: Vout (5V/div).
Ch 2: ON/OFF input(1V/div)

Figure 4: Shut-down fall time at full load (20ms/div).
Ch 1: Vout (5V/div)
Ch 2: ON/OFF input (1V/div)

 

Figure 5: Output voltage response to step-change in load
current (50%-75%-50% of Iout(max); dI/dt = 0.1A/μs). Load
cap: 200μF, 45m Ω ESR tantalum capacitor and 1μF
ceramic capacitor. Ch 1: Vout (500mV/div, 400uS /div).

Figure 6: Output voltage response to step-change in load
current (50%-75%-50% of Iout(max): dI/dt = 2.5A/μs). Load
cap: 200μF, 45m Ω ESR tantalum capacitor and 1μF
ceramic cap. Ch 1: Vout (200mV/div,400uS/div).

 

Figure 7: Output voltage ripple at nominal input voltage and
rated load current (20mV/div). Load capacitance: 1μF
ceramic capacitor and 10μF tantalum capacitor. Bandwidth:
20 MHz.

 

6. Pin Function Description
6.1 Enable (ON/OFF) Control (Pin 1) 

The Enable pin allows the power module to be switched on and off electronically. The Enable (On/Off) function is
useful for conserving battery power, for pulsed power application or for power up sequencing.
The Enable pin is referenced to the -Vin. It is pulled up internally, so no external voltage source is required. An open
collector (or open drain) switch is recommended for the control of the Enable pin.
When using the Enable pin, make sure that the reference is really the -Vin pin, not ahead of EMI filtering or
remotely from the unit. Optically coupling the control signal and locating the opto coupler directly at the module will
avoid any of these problems. If the Enable pin is not used, it can be left floating (positive logic) or connected to the -Vin
pin (negative logic).Figure A details five possible circuits for driving the ON/OFF pin. Figure B is a detailed look of
the internal ON/OFF circuitry.

Figure A: Various circuits for driving the ON/OFF pin.

Figure B: Internal ON/OFF pin circuitry.

 

 

6.2 Voltage Trim (Pin 6)
Output voltage can be adjusted up or down with an external resistor. There are positive trim logic and negative
trim logic available. For positive logic, the output voltage will increase when an external trimming resistor is connected
between the Trim and Vout(+) pin. The output voltage will decrease when an external trimming resistor is connected
between Trim and Com pin. A multi-turn 20Ký trim pot can also be used to adjust the output voltage up or down.(Figure
C & D).

 

Output Trim

Trim-Up	Trim Pin to Com
Trim-Down	Trim Pin to Vout(+)

 

 

Figure C: Output-voltage Trim external circuit

Figure D: Trim Pot Connection.

 

7. Basic Operation and Features Application
7.1 Output Ripple & Noise Test
The output ripple is composed of fundamental frequency ripple and high frequency switching noise spikes. The
fundamental switching frequency ripple (or basic ripple) is in the 100KHz to 1MHz range; the high frequency switching
noise spike (or switching noise) is in the 10 MHz to 50MHz range. The switching noise is normally specified with 20
MHz bandwidth to include all significant harmonics for the noise spikes.
The easiest way to measure the output ripple and noise is to use an oscilloscope probe tip and ground ring pressed
directly against the power converter output pins, as shown below. This makes the shortest possible connection across
the output terminals.The oscilloscope probe ground clip should never be used in the ripple and noise measurement. The
ground clip will not only act as an antenna and pickup the radiated high frequency energy, but it will introduce the
common-mode noise to the measurement as well.
The standard test setup for ripple & noise measurements is shown in Figure E. A probe socket (Tektronix, P.N.
131.0258-00) is used for the measurements to eliminate noise pickup associated with long ground clip of scope probes.

Figure E: Ripple & Noise Standard Testing Means.

 

7.2 Typical Application Circuit

Figure F: Typical application circuit (negative logic unit, permanently enabled).

Application Circuits: Figure F below provides a typical circuit diagram which details the input filtering and
voltage trimming.

 

7.3 Input Filtering

DC-DC converters, by nature, generate significant levels of both conducted and radiated noise. There are two types
of conducted noise: common mode and differential mode noise. The common mode noise is directly related to the
effective parasitic capacitance between the power module input conductors and chassis ground. The differential mode
noise is across the input conductors. It is recommended to have some level of EMI suppression to the power module.
Conducted noise on the input power lines can occur as either differential or common-mode noise currents. The
required standard for conducted emissions is EN55022 Class A (FCC Part15). (See Figure G)

Figure G: Input Filtering

 

7.4 Input Reflected Ripple Current

The converter is drawing current from input power
source only when the input switch is on. This creates a
pulsation current flow from the input source. The reflected
ripple current is measured as a peak-to-peak current with a
current probe over 0 to 20MHz bandwidth. Ripple current
can be suppressed by an external Π (pi) filter as shown
below. see Figure H.

Figure H: Input Reflected Ripple Current.

 

7.5 Protection Features
·Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping avoid
an input system instability problem, The lockout circuitry is a comparator with DC hysteresis. When the input voltage is
rising, it must exceed the typical Turn-On Voltage Threshold value(listed on the specification page) before the converter
will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value
before the converter will turn off.
·Output Current Limit: The maximum current limit remains constant as the output voltage drops. However, once the
impedance of the short across the output is small enough to make the output voltage drop below the specified Output
DC Current-Limit Shutdown Voltage, the converter into hiccup mode indefinite short circuit protection state until the
short circuit condition is removed. This prevents excessive heating of the converter or the load board.
·Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module.
The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches
the Over-Temperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed
location falls by the amount of the Over-Temperature Shutdown Restart Hysteresis value.

 

8. MECHANICAL DIAGRAM

 

NOTES:
1. All pins are 0.040” (1.02mm) dia. with 0.09” (2.2mm) dia. standoff shoulders.

 

8.1 Pin Designations

Pin No.	Name	Function
1	Enable	TTL input to turn converter on and off, referenced to Vin(-), with internal pull up.
2	Vin(-)	Negative input voltage
3	Vin(+)	Positive input voltage
4	Vout(+)	Positive output voltage
5	Com	Ground
6	Vout(-)	Negative output voltage