Additional Resources: Product Page | 3D Model | PCB Footprint ddaattee 02/07/2019 ppaaggee 11 ooff 77 SERIES: PQA50-D │ DESCRIPTION: DC-DC CONVERTER FEATURES • up to 50 W isolated output • 2:1 input range (18~36 Vdc, 36~75 Vdc) • smaller package • single, regulated output • 1,500 Vdc isolation • short circuit, over current, input under voltage protection • remote on/off • operating temperature range (-40~85°C) • six sided metal shielding • efficiency up to 93% MODEL input output output output ripple efficiency voltage voltage current power and noise1 typ range min max max max typ (Vdc) (Vdc) (Vdc) (mA) (A) (W) (mVp-p) (%) PQA50-D24-S3-D 24 18~36 3.3 500 10 33 150 91 PQA50-D24-S5-D 24 18~36 5 500 10 50 150 93 PQA50-D24-S12-D 24 18~36 12 208 4.167 50 150 93 PQA50-D24-S15-D 24 18~36 15 167 3.333 50 150 93 PQA50-D24-S24-D 24 18~36 24 104 2.083 50 150 93 PQA50-D48-S3-D 48 36~75 3.3 500 10 33 150 91 PQA50-D48-S5-D 48 36~75 5 500 10 50 150 93 PQA50-D48-S12-D 48 36~75 12 208 4.167 50 150 93 PQA50-D48-S15-D 48 36~75 15 167 3.333 50 150 93 PQA50-D48-S24-D 48 36~75 24 104 2.083 50 150 93 Notes: 1. Ripple and noise are measured at 20 MHz BW by "parallel cable" method with 1 μF ceramic and 10 μF electrolytic capacitors on the output. PART NUMBER KEY PQA50 - DXX - SXX - DX Base Number Heatsink* "blank" = no heatsink Input Voltage Packaging Style H = with heatsink Output Voltage DIP Notes: *Discontinued heatsink versions. cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PQA50-D │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 2 of 7 INPUT parameter conditions/description min typ max units 24 Vdc input models 18 24 36 Vdc operating input voltage 48 Vdc input models 36 48 75 Vdc input under voltage protection 24 Vdc input models 18 Vdc 48 Vdc input models 36 Vdc start-up voltage input over voltage protection 24 Vdc input models 36 Vdc 48 Vdc input models 75 Vdc input under voltage protection 24 Vdc input models 16 Vdc 48 Vdc input models 32 Vdc under/over voltage shutdown input over voltage protection 24 Vdc input models 40 Vdc 48 Vdc input models 81 Vdc for maximum of 1 second surge voltage 24 Vdc input models -0.7 50 Vdc 48 Vdc input models -0.7 100 Vdc start-up time nominal input, constant load 10 ms models ON (CTRL open or connect TTL high level, 3~12 Vdc) CTRL1 models OFF (CTRL connect GND or low level, 0~1.2 Vdc) input current (models OFF) 6 mA filter pi filter Note 1. CTRL pin voltage is referenced to GND. OUTPUT parameter conditions/description min typ max units line regulation full load, input voltage from low to high ±0.2 ±0.5 % load regulation 10% to 100% load ±0.5 ±1 % voltage accuracy ±1 ±3 % adjustability ±10 % switching frequency PWM mode 300 kHz transient recovery time 25% load step change 300 500 μs transient response deviation 25% load step change ±3 ±5 % temperature coefficient 100% load ±0.02 %/°C PROTECTIONS parameter conditions/description min typ max units 3.3 Vdc output models 3.9 Vdc 5 Vdc output models 6.2 Vdc over voltage protection2 12 Vdc output models 15 Vdc 15 Vdc output models 18 Vdc 24 Vdc output models 30 Vdc over current protection 135 % short circuit protection continuous, automatic recovery, hiccup over temperature protection 110 °C Note 2. Module needs to be re-started after over voltage protection. cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PQA50-D │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 3 of 7 SAFETY AND COMPLIANCE parameter conditions/description min typ max units isolation voltage input to output at 1 mA for 1 minute 1,500 Vdc isolation resistance input to output at 500 Vdc 1,000 MΩ isolation capacitance input to output at 100 kHz, 0.1 Vdc 2,000 pF conducted emissions CISPR22/EN55022 class B (external circuit required, see figure 1) radiated emissions CISPR22/EN55022 class B (external circuit required, see figure 1) ESD IEC/EN61000-4-2 class B, contact ± 4kV radiated immunity IEC/EN61000-4-3 class A, 10V/m EFT/burst IEC/EN61000-4-4 class B, ± 2kV (external circuit required, see figure 1) surge IEC/EN61000-4-5 class B, ± 2kV (external circuit required, see figure 1) conducted immunity IEC/EN61000-4-6 class A, 3 Vr.m.s voltage dips & interruptions IEC/EN61000-4-29 class B, 0%-70% MTBF as per MIL-HDBK-217F @ 25°C 1,000,000 hours RoHS 2011/65/EU ENVIRONMENTAL parameter conditions/description min typ max units operating temperature see derating curve -40 85 °C storage temperature -55 125 °C storage humidity non-condensing 5 95 % case temperature at full load, operating temperature curve range 105 °C vibration 10~55 Hz, 30 min. along x, y, and z 10 G SOLDERABILITY parameter conditions/description min typ max units hand soldering 1.5 mm from case for 10 seconds 300 °C wave soldering see wave soldering profile 260 °C Peak Temp. 260°C Max. 250 Wave Soldering Time 4 Sec. Max. 200 C) 10 Sec. Max. ° e (150 ur at er p100 m Te 50 0 Time (sec.) MECHANICAL parameter conditions/description min typ max units board mount: 50.80 x 25.40 x 11.80 mm dimensions board mount with heatsink: 50.80 x 25.40 x 16.30 mm case material aluminum alloy board mount 35 g weight board mount with heatsink 43 g cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PQA50-D │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 4 of 7 MECHANICAL DRAWING BOARD MOUNT units: mm[inch] tolerance: ±0.30[±0.012] pin diameter tolerance: ±0.10[±0.004] pin height tolerance: ±0.50[±0.020] 0] 50.80[2.000] Grid Size: 20 45.72[1.800] ∅1.50[0.059] 2.54mm x 2.54mm 0. PIN CONNECTIONS 8[ 0 PIN Function 5. 1 6 1600] 0] 3 4 1234 GTCVrNtiimnrDl 10.16[0.400] 23 54 10.10.16[0.4[0.400] 25.40[1.00 12 65 5 0V Bottom View 6 +Vo PCB Layout Top View 05] 86 11.0.4 [ ∅1.00[0.039] 4.10 [0.161] Front View BOARD MOUNT WITH HEATSINK units: mm[inch] tolerance: ±0.30[±0.012] pin diameter tolerance: ±0.10[±0.004] pin height tolerance: ±0.50[±0.020] Grid Size: ∅1.50[0.059] 2.54mm x 2.54mm PIN CONNECTIONS PIN Function 4 3 1 Vin 2 GND 5 2 3 Ctrl 4 Trim 1 6 5 0V Top View 6 +Vo PCB Layout Top View Front View cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PQA50-D │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 5 of 7 DERATING CURVES Output Voltage ≤ 5Vdc Output Voltage > 5Vdc With heatsink With heatsink 100 100 Without heatsink Without heatsink %) 80 %) 80 Load ( 6400 Safe operating area Load ( 6400 Safe operating area 20 20 -40 -20 0 20 40 55 65 85 100 -40 -20 0 20 40 60 70 85 100 Ambient Temperature (°C) Ambient Temperature (°C) EMC RECOMMENDED CIRCUIT Figure 1 Table 1 Recommended external circuit components LCM CY1 Vin Vin +Vo Vin (Vdc) 24 48 C0 330μF/50V 330μF/100V Cout DC/DC LOAD C0 CY1, CY2 1nF/2kV 1nF/2kV GND GND 0V LCM 2.2mH 2.2mH CY2 Note: 1. See Table 3 for Cout values. TEST CONFIGURATION Figure 2 Table 2 Oscilloscope External components Lin Lin 4.7μH Current 220μF, ESR < 1.0Ω Cin Probe DC DC Load Cin at 100 kHz Lin(4.7µH) Cin(220µF, ESR < 1.0Ω at 100 KHz) Note: 1. Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance. cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PQA50-D │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 6 of 7 APPLICATION NOTES 1. Requirement on output load To ensure this module can operate efficiently and reliably, the minimum output load cannot be less than 5% of the full load during operation. If the actual output power is small, please connect a resistor at the output end in parallel to increase the load. 2. Recommended circuit This series has been tested according to the following recommended testing circuit before leaving the factory. This series should be tested under load (see Figure 3). If you want to further decrease the input/output ripple, you can increase capacitance properly or choose capacitors with low ESR (see table 3). However, the capacitance must not exceed the maximum capacitive load or a start-up problem might arise (see table 4). Figure 3 Vin +Vout Cin DC DC GND 0V Table 3 Table 4 Vout Cin Cout Max. Vout (Vdc) (µF) (µF) Capacitive Load (Vdc) (μF) 3.3 100 220 3.3 27000 5 100 220 5 18900 12 100 100 12 3700 15 100 100 24 100 47 15 2000 24 1000 3. Output Voltage Trimming Leave open if not used. Figure 4 Formula for Trim Resistor Application Circuit for Trim Pin (part in broken line is the interior of models) aR2 Vref up: RT= R2-a -R3 a=Vo’-Vref R1 +Vo +Vo aR1 Vo’-Vref R1 down: RT= R1-a -R3 a= Vref R2 Vref R3 Trim VRre1f R 3 RT Trim Note: Value for R1, R2, R3, and Vref (see Table 5) R2 RT R2 RT: Trim Resistor a: User-defined parameter, no actual meanings Vo': The trim up/down voltage 0V 0V Trimup Trimdown Vout R1 R2 R3 Vref (Vdc) (kΩ) (kΩ) (kΩ) (V) 3.3 4.788 2.87 15 1.24 Table 5 5 2.87 2.87 12.1 2.5 12 11 2.87 22 2.5 15 15 3 22 2.5 24 20 2.308 15 2.5 Notes: 1. Minimum load shouldn't be less than 5%, otherwise ripple may increase dramatically. Operation under minimum load will not damage the converter, however, they may not meet all specifications listed. 2. Maximum capacitive load is tested at input voltage range and full load. 3. All specifications are measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified. cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PQA50-D │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 7 of 7 REVISION HISTORY rev. description date 1.0 initial release 07/01/2013 1.01 added heat sink option, updated spec 10/29/2013 1.02 updated datasheet 07/14/2015 1.03 discontinued heat sink versions 02/07/2019 The revision history provided is for informational purposes only and is believed to be accurate. Headquarters 20050 SW 112th Ave. Fax 503.612.2383 Tualatin, OR 97062 cui.com 800.275.4899 techsupport@cui.com CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website. CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use. CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.