LRS3033N007N25W

LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion 3.3V 7A 1X1 Isolated Converter Features          High efficiency, 86% (3.3V/7A) Optimal thermal performance Industry standard footprint and pin out Low profile Robust stability Monotonic start-up Fixed frequency operation Basic Insulation, 2250Vdc input-to-output isolation Designed to meet UL 60950-1 2nd edition † Options    Negative/Positive enable logic Auto-restart after fault shutdown Various pin lengths Part Numbering System LRS Series Name: LRS 033 007 5 Input Voltage: Output Voltage: Enabling Logic: Rated Output Current: See suffix Unit: 0.1V 033:3.3V P: positive N:negative Mechanical Options Lead-free, (ROHS-6 Compliant) 5: open frame 3 Unit: A 007:7A Pin Length Options: K:0.110" N:0.145" R:0.180" Electrical Options: 0:latch-up 2:auto-restart W Suffix W:18-75V Input voltage † UL is a registered trademark of Underwriters Laboratory Inc. Datasheet LRS3033x007xxxW 02-22-2017 1 LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion Absolute Maximum Ratings Excessive stresses over these absolute maximum ratings can cause permanent damage to the converter. Operation should be limited to the conditions outlined under the Electrical Specification Section. Parameter Input Voltage (continuous) Input Voltage ( < 100ms, operating) Input Voltage (continuous, non-operating) Operating Ambient Temperature (See Thermal Consideration section) Storage Temperature Symbol Min Max Unit Vi Vi, trans Vi -0.5 - 75 100 100 Vdc Vdc Vdc To -40 85* ˚C Tstg -55 125 ˚C * Derating curves provided in this datasheet end at 85ºC ambient temperature. Operation above 85ºC ambient temperature is allowed provided the temperatures of the key components or the baseplate do not exceed the limit stated in the Thermal Considerations section. Electrical Specifications These specifications are valid over the converter’s full range of input voltage, resistive load, and temperature unless noted otherwise. Input Specifications Parameter Input Voltage Input Current Quiescent Input Current (Typical Vin) Standby Input Current Input Reflected-ripple Current, Peak-to-peak (5 Hz to 20 MHz, 12 μH source impedance) Input Ripple Rejection (120 Hz) Input Turn-on Voltage Threshold Input Turn-off Voltage Threshold Input Voltage ON/OFF Hysteresis Output Specifications Parameter Output Voltage Set Point (Typical Vin; Io = Io,max; Ta = 25°C) Output Voltage Set Point Accuracy (Typical Vin; Io = Io,max; Ta = 25°C) Output Voltage Set Point Accuracy(over all conditions) Output Regulation: Line Regulation (Over full input range, Io = 1/2 of load) Load Regulation (Io = Io,min to Io,max, typical Vin) Temperature (Ta = -40°C to 85 °C) Output Ripple and Noise Voltage RMS Peak-to-peak (5 Hz to 20 MHz bandwidth, Vin = 36V) External Load Capacitance Output Current Output Power Efficiency (Typical Vin; Io = Io,max, TA = 25ºC) Startup Delay (from the toggle of the enable to Vo reaching 10% of set point; Typical Vin; Io=Io,max; Ta = 25ºC) Startup Time (Vo from 10% to 90% of output set point; Typical Vin; Io = Io,max; Ta = 25ºC) Datasheet LRS3033x007xxxW Symbol Min Typical Max Unit Vi Ii,max Ii,Qsnt Ii,stdby 18 - 36 30 3 75 2.5 40 5 Vdc A mA mA - - 20 - mA - 16 14 1 17 15 2 18 16 3 dB V V V Symbol Min Typical Max Unit - 3.3 - Vdc +1.5 %Vo - -1.5 -3 - 3 %Vo - - 0.05 0.05 0.1 0.2 0.2 %Vo %Vo %Vo - - Io Po 0 0 20 60 - 30 100 500 7 23 mVrms mVp-p μF A W η - 86 - % 02-22-2017 1 ms 3 ms 2 LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion Output Specifications (continued) Parameter Total turn on time (from the toggle of the enable to Vo reaching in regulation of the output set point; Overall condition) Output Over Current Protection trip point/Iomax Output Over Voltage trip point Output ripple frequency Output Voltage Trim Range Dynamic Response (Typical Vin; Ta = 25°C; Load transient 0.1A/μs) Load step from 50% to 75% of full load: Peak deviation Settling time (to 10% band of Vo deviation) Load step from 50% to 25% of full load Peak deviation Settling time (to 10% band of Vo deviation) General Specifications Parameter Symbol Min Typical Max 4 Io,cli - 110 115 340 80 125 370 - Unit ms 170 140 400 110 %Io %Vo kHz %Vo 4 100 %Vo μs 4 100 %Vo μs Symbol Min Typical Max Unit Logic Low – Module On Logic High – Module Off - - - - - Logic High – Module On Logic Low – Module Off - - - - - VON/OFF ION/OFF VON/OFF ION/OFF 0 3.5 - - 1.2 1.0 15 50 V mA V μA - 10 1500 - - pF MΩ Remote Enable Negative Logic: Positive Logic: Logic Low: Logic High: ION/OFF = 1.0mA VON/OFF = 0.0V ION/OFF = 0.0μA Leakage Current Isolation Capacitance Isolation Resistance Calculated MTBF (Telecordia SR-332, 2011, Issue 3), full load, 40°C, typical input voltage Datasheet LRS3033x007xxxW 11.8 02-22-2017 106 -hour 3 LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion Efficiency (%) Power Loss (W) Characteristic Curves Output Current (A) Output Current (A) o o Figure 2.Power Loss vs. Load Current (25 C) Figure 1.Efficiency vs. Load Current (25 C) Output Control (2V/div) Output Voltage Ripple (50mV/div) Output Voltage (1V/div) Vin = 18V Vin = 36V Vin = 75V Time – t (2μs/div) Figure 4.Output Ripple Voltage at Full Load Output Current 2A/div Output Current Output Voltage 200mV/div 2A/div Output voltage 200mV/div Time – t (2ms/div) Figure 3.Start-Up from Enable Control (Typical Vin, full load ) Time – t (200μs/div) Figure 5.Transient Load Response Datasheet LRS3033x007xxxW Time – t (200μs/div) Figure 6.Transient Load Response 02-22-2017 4 LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion 155℃ output Current (A) 140℃ 110℃ 80℃ 60℃ Airflow Direction 3 2 4 Air Flow 1 Ambient Air Temperature (°C) Figure 7.CurrentDeratingCurve for AirflowDirection3 (Ref.Fig.8for Airflow Direction; open frame unit soldered interface) Figure 8.Thermal Image for Airflow Direction 3 (7A output, 55°C ambient, 200 LFM, typical Vin, open frame unit using soldered interface) 155℃ Output Current (A) 140℃ 110℃ 80℃ 60℃ Airflow Direction 2 3 4 Air Flow 1 Ambient Air Temperature (°C) , Figure 9.CurrentDeratingCurve for AirflowDirection2 (Ref.Fig.10for Airflow Direction; open frame unit soldered interface) Datasheet LRS3033x007xxxW Figure 10.Thermal Image for Airflow Direction 2 (7A output, 55°C ambient, 200 LFM, typical Vin, open frame unit using soldered interface) 02-22-2017 5 LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion Feature Descriptions Remote ON/OFF The converter can be turned on and off by changing the voltage or resistance between the ON/OFF pin and Vin(-). The LRS3 Series of converters is available with factory selectable positive logic or negative enabling logic. For the negative control logic, the converter is ON when the ON/OFF pin is at a logic low level and OFF when the ON/OFF pin is at a logic high level. With positive control logic, the converter is ON when the ON/OFF pin is at a logic high level and OFF when the ON/OFF pin is at a logic low level. With the internal pull-up circuitry, a simple external switch between the ON/OFF pin and Vin(-) can control the converter. A few example circuits for controlling the ON/OFF pin are shown in Figures 11, 12 and 13. The logic low level is from 0V to 1.2V and the maximum sink current during logic low is 1mA. The external switch must be capable of maintaining a logic-low level while sinking up to this current. The logic high level is from 3.5V to 15V. The converter has an internal pull-up circuit that ensures the ON/OFF pin at a high logic level when the leakage current at ON/OFF pin is no greater than 50μA. TTL/ CMOS ON/OFF Vin(−) Figure 13.Direct Logic Drive Output Voltage Adjustment (Trim) The trim pin allows the user to adjust the output voltage set point. To increase the output voltage, an external resistor is connected between the TRIM pin and Vout(-). To decrease the output voltage, an external resistor is connected between the TRIM pin and Vout (+). The output voltage trim range is 80% to 110% of its specified nominal output voltage. The circuit configuration for trim down operation is shown in Figure14. To decrease the output voltage, the value of the external resistor should be Rdown = ( (Vadj − 1.225) ⋅10 − 0.511)(kΩ) Vnom − Vadj Where ON/OFF Vnom= Typical Output Voltage Vadj= Adjusted Output Voltage The circuit configuration for trim up operation is shown in Figure15.To increase the output voltage, the value of the resistor should be Vin(−) Rup = ( Figure 11.Opto Coupler Enable Circuit 1.225 ⋅ 10 − 0.511)(kΩ) Vadj − Vnom Where ON/OFF Vin(−) Vnom= Typical Output Voltage Vadj= Adjusted Output Voltage As the output voltage at the converter output terminals are higher than the specified nominal level when using the trim up and/or remote sense functions, it is important not to exceed the maximum power rating of the converter as given in the Specifications table. Figure 12.Open Collector Enable Circuit Datasheet LRS3033x007xxxW 02-22-2017 6 LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion Output Over-Voltage Protection (OVP) Load Vo(+) TRIM Rdown With the auto-restart version, the converter will operate in a hiccup mode (repeatedly try to restart) until the cause of the over-voltage condition is cleared. Vo(−) Figure14.Circuit to Decrease Output Voltage Vo(+) Rup Load TRIM With the latch-off version, the converter will latch off when the output voltage exceeds the limit. The converter can be restarted by toggling the ON/OFF switch or recycling the input voltage. Vo(−) Figure15.Circuit to Increase Output Voltage Over Temperature Production (OTP) With the latch-off version, the converter will shut down and latch off if an over-temperature condition is detected. The converter has a temperature sensor located at a carefully selected position in the converter circuit board, which represents the thermal condition of key components of the converter. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensor reaches 120°C. The module can be restarted by toggling the ON/OFF switch or recycling the input voltage. With the auto-restart version, the converter will resume operation after the converter cools down. Input Under-Voltage Lockout This feature prevents the converter from starting until the input voltage reaches the turn-on voltage threshold, and keeps the converter running until the input voltage falls below the turn-off voltage threshold. Both turn-on and turn-off voltage thresholds are defined in the Input Specifications table. The hysteresis prevents oscillations. Output Over-Current Protection (OCP) This converter can be ordered in either latch-off or auto-restart version upon OCP, OVP, and OTP. With the latch-off version, the converter will latch off when the load current exceeds the limit. The converter can be restarted by toggling the ON/OFF switch or recycling the input voltage. With the auto-restart version, the converter will operate in a hiccup mode (repeatedly try to restart) until the cause of the over-current condition is cleared. Datasheet LRS3033x007xxxW Design Considerations As with any DC/DC converter, the stability of the LRS3 converters may be compromised if the source impedance is too high or inductive. It’s desirable to keep the input source ac-impedance as low as possible. Although the converters are designed to be stable without adding external input capacitors for typical source impedance, it is recommended to add 220 µF low ESR electrolytic capacitors at the input of the converter for each 100W output power, which reduces the potential negative impact of the source impedance on the converter stability. These electrolytic capacitors should have sufficient RMS current rating over the operating temperature range. The converter is designed to be stable without additional output capacitors. To further reduce the output voltage ripple or improve the transient response, additional output capacitors are often used in applications. When additional output capacitors are used, a combination of ceramic capacitors and tantalum/polymer capacitors shall be used to provide good filtering while assuring the 02-22-2017 7 LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion stability of the converter. opening, a board-to-board spacing of 1”, and the converter is soldered to the test board with thermal relieves. Safety Considerations Note that the natural convection condition was measured at 0.05 m/s to 0.15 m/s (10ft./min. to 30 ft./min. The LRS3 Series of converters are designed in accordance with EN 60950 Safety of Information Technology Equipment Including Electrical Equipment. Flammability ratings of the PWB and plastic components in the converter meet 94V-0. To protect the converter and the system, an input line fuse is highly recommended on the un-grounded input end. Thermal Considerations The LRS3 Series of converters can operate in various thermal environments. Due to the high efficiency and optimal heat distribution, these converters exhibit excellent thermal performance. The maximum allowable output power of any power converter is usually determined by the electrical design and the maximum operating temperature of its components. The LRS3 Series of converters have been tested comprehensively under various conditions to generate the derating curves with the consideration for long term reliability. The thermal derating curves are highly influenced by the test conditions. One of the critical variables is the interface method between the converter and the test fixture board. There is no standard method in the industry for the derating tests. Some suppliers use sockets to plug in the converter, while others solder the converter into the fixture board. It should be noticed that these two methods produce significantly different results for a given converter. When the converter is soldered into the fixture board, the thermal performance of the converter is significantly improved compared to using sockets due to the reduction of the contact loss and the thermal impedance from the pins to the fixture board. Other factors affecting the results include the board spacing, construction (especially copper weight, holes and openings) of the fixture board and the spacing board, temperature measurement method and ambient temperature measurement point. The thermal derating curves in this datasheet are obtained using a PWB fixture board and a PWB spacing board with no Datasheet LRS3033x007xxxW Heat Transfer With single-board DC/DC converter designs, convection heat transfer is the primary cooling means for converters without a baseplate. Therefore, airflow speed should be checked carefully for the intended operating environment. Increasing the airflow over the converter enhances the heat transfer via convection. Figure 16 shows a recommended temperature monitoring point for open frame modules. For reliable operation, the temperature at this location should not continuously exceed 120 °C. Figure 16.Temperature Monitoring Location EMC Considerations The EMC performance of the converter is related to the layout and filtering design of the customer board. Careful layout and adequate filtering around the converter are important to confine noise generated by the switching actions in the converter and to optimize system EMC performance. 02-22-2017 8 LRS3033x007xxxW 18-75V Input, 3.3V/7A Output Leading the Advancement of Power Conversion Mechanical Information Notes: 1) 2) 3) 4) 5) 6) Datasheet LRS3033x007xxxW All dimensions in mm (inches) Tolerances: .x + .5 (.xx + 0.02) .xx + .25 (.xxx + 0.010) Input and function pins are 1.02mm (0.040”) dia. with +/- 0.10mm (0.004”) tolerance. The recommended diameter of the receiving hole is 1.42mm (0.056’’). Output pins are 1.02mm (0.040”) dia. with +/- 0.10mm (0.004”) tolerance. The recommended diameter of the receiving hole is 1.42mm (0.056’’). All pins are coated with 90%/10% solder, Gold, or Matte Tin finish with Nickel under plating. Weight: 10g open frame converter Workmanship meets or exceeds IPC-A-610 Class II 02-22-2017 9