Additional Resources: Product Page | 3D Model | PCB Footprint ddaattee 02/07/2019 ppaaggee 11 ooff 77 SERIES: PYB20 │ DESCRIPTION: DC-DC CONVERTER FEATURES • up to 20 W isolated output • industry standard pinout • 4:1 input range (9~36 Vdc, 18~75 Vdc) • smaller package • single/dual regulated outputs • 1,500 Vdc isolation • continuous short circuit, over current protection, over voltage protection • temperature range (-40~85°C) • UL 60950-1 approval • six-sided metal shielding • efficiency up to 90% MODEL input output output output ripple efficiency voltage voltage current power and noise2 typ range min max max max typ (Vdc) (Vdc) (Vdc) (mA) (mA) (W) (mVp-p) (%) PYB20-Q24-S3 24 9~36 3.3 250 5000 16.5 100 86 PYB20-Q24-S5 24 9~36 5 200 4000 20 100 90 PYB20-Q24-S12 24 9~36 12 84 1667 20 100 89 PYB20-Q24-S15 24 9~36 15 67 1333 20 100 90 PYB20-Q24-S24 24 9~36 24 42 834 20 100 90 PYB20-Q24-D5 24 9~36 ±5 ±100 ±2000 20 100 86 PYB20-Q24-D12 24 9~36 ±12 ±42 ±834 20 100 88 PYB20-Q24-D15 24 9~36 ±15 ±33 ±667 20 100 88 PYB20-Q48-S31 48 18~75 3.3 250 5000 16.5 100 86 PYB20-Q48-S51 48 18~75 5 200 4000 20 100 90 PYB20-Q48-S121 48 18~75 12 84 1667 20 100 89 PYB20-Q48-S151 48 18~75 15 67 1333 20 100 90 PYB20-Q48-S241 48 18~75 24 42 834 20 100 90 PYB20-Q48-D5 48 18~75 ±5 ±100 ±2000 20 100 86 PYB20-Q48-D12 48 18~75 ±12 ±42 ±834 20 100 88 PYB20-Q48-D15 48 18~75 ±15 ±33 ±667 20 100 89 Notes: 1. UL approved 2. 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 PYB20 - QXX - XXX - X Heatsink* Base Number "blank" = no heatsink Input Voltage Output Voltage Output H = with heatsink S = single D = dual Notes: *Discontinued heatsink versions. cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PYB20 │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 2 of 7 INPUT parameter conditions/description min typ max units 24 Vdc input models 9 24 36 Vdc operating input voltage 48 Vdc input models 18 48 75 Vdc 24 Vdc input models 9 Vdc start-up voltage 48 Vdc input models 17.8 Vdc 24 Vdc input models 7.5 Vdc under voltage shutdown1 48 Vdc input models 16 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 filter pi filter models ON (CTRL open or connect TTL high level, 2.5~12 Vdc) CTRL2 models OFF (CTRL connect GND or low level, 0~1.2 Vdc) input current (models OFF) 1 mA Notes: 1. Contact CUI if you are planning to use this feature in your application. 2. 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 5% to 100% load ±0.5 ±1 % dual output models: cross regulation main output 50% load, secondary output from ±5 % 10% to 100% load voltage accuracy ±1 ±3 % voltage balance3 dual output, balanced loads ±0.5 ±1 % adjustability4 ±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 Note: 3. For dual output models, unbalanced loads should not exceed ±5%. If ±5% is exceeded, it may not meet all specifications. 4. Output trimming available on single output models only. PROTECTIONS parameter conditions/description min typ max units short circuit protection hiccup, continuous, automatic recovery over current protection 160 % 3.3 Vdc output models 3.9 Vdc 5 Vdc output models 6.2 Vdc over voltage protection 12 Vdc output models 15 Vdc 15 Vdc output models 18 Vdc 24 Vdc output models 30 Vdc SAFETY AND COMPLIANCE parameter conditions/description min typ max units isolation voltage input to output for 1 minute at 1 mA max. 1,500 Vdc isolation resistance input to output at 500 Vdc 1,000 MΩ safety approvals5 UL 60950-1, CE Note: 5. See specific models noted on page 1, excludes heat sink versions. cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PYB20 │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 3 of 7 SAFETY AND COMPLIANCE (CONTINUED) parameter conditions/description min typ max units conducted emissions CISPR22/EN55022, class A, class B (external circuit required, see Figure 1-b) radiated emissions CISPR22/EN55022, class A, class B (external circuit required, see Figure 1-b) 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-a) surge IEC/EN61000-4-5, class B, ± 2kV (external circuit required, see Figure 1-a) 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 curves -40 85 °C storage temperature -55 125 °C storage humidity non-condensing 5 95 % case temperature at full load, Ta=71°C 105 °C vibration 10~55 Hz for 30 min. along X, Y and Z axis 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(cid:263)Max 250 Every Wave Soldering Time 4 sec.Max 200 (cid:263)) 10 Sec Max e (150 ur at er p100 m e T 50 0 Time (sec.) MECHANICAL parameter conditions/description min typ max units board mount: 50.8 x 25.4 x 11.8 mm dimensions board mount with heatsink: 50.8 x 25.4 x 16.3 mm case material aluminum alloy board mount 28 g weight board mount with heatsink 36 g cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PYB20 │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 4 of 7 MECHANICAL DRAWING BOARD MOUNT units: mm[inch] tolerance: ±0.3[±0.012] pin diameter tolerance: ±0.10[±0.004] pin height tolerance: ±0.50[±0.020] Grid Size: 2.54mm x 2.54mm PIN CONNECTIONS Single Dual PIN Output Output 1 GND GND Front View 2 Vin Vin 3 +Vo +Vo 4 Trim 0V 5 0V -Vo PCB Layout 6 CTRL CTRL Top View Bottom View BOARD MOUNT WITH HEATSINK units: mm[inch] tolerance: ±0.3[±0.012] pin diameter tolerance: ±0.10[±0.004] pin height tolerance: ±0.50[±0.020] Grid Size: 2.54mm x 2.54mm PIN CONNECTIONS Single Dual PIN Output Output 1 GND GND 2 Vin Vin Front View 3 +Vo +Vo 4 Trim 0V PCB Layout Top View 5 0V -Vo 6 CTRL CTRL Top View cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PYB20 │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 5 of 7 DERATING CURVES With heatsink 100 80 ) % Without heatsink ( d 60 a o Safe operating area L 40 20 -40 -20 0 20 40 5560 85 Ambient Temperature (°C) EMC RECOMMENDED CIRCUIT Table 1 Figure 1 Recommended external circuit components Vin (Vdc) 24 48 FUSE LDM1 CY1 FUSE Choose according to input current Vin Vin +Vo MOV S14K35 S14K60 + MOV C0 C1 DC/DC Cout LOAD LDM1 4.7μH 4.7μH GND GND -Vo C0 330μF/50V 330μF/100V (a) (b) (0V) CY2 C1 1μF/50V 1μF/100V CY1 1nF/2kV 1nF/2kV CY2 1nF/2kV 1nF/2kV Note: 1. See Table 2 for Cout values. cui.com

Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc │ SERIES: PYB20 │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 6 of 7 APPLICATION NOTES 1. 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 2). If you want to further decrease the input/output ripple, you can increase the capacitance accord- ingly or choose capacitors with low ESR (see Table 2). However, the capacitance of the output filter capacitor must be appropriate. If the capacitance is too high, a startup problem might arise. For every channel of the output, to ensure safe and reliable operation, the maximum capacitance must be less than the maximum capacitive load (see Table 3). Figure 2 Single Output Dual Output +Vo Vin +Vo Vin Cout Cin DC DC Cout Cin DC DC 0V Cout GND 0V GND -Vo Table 2 Table 3 Sing le Vout Cin Cout Dual Vout Cin Cout1 Single Vout Max. Capacitive Load Dual Vout Max. Capacitive Load1 ( Vdc) (µF) (µF) (Vdc) (µF) (µF) (Vdc) (μF) (Vdc) (μF) 3.3 100 470 -- -- -- 3.3 10200 -- -- 5 100 470 ±5 100 220 5 4020 5 4800 12 100 220 ±12 100 100 12 1035 12 800 15 100 220 ±15 100 100 15 705 15 500 24 100 100 -- -- -- 24 470 -- -- Note: 1. For each output. Note: 1. For each output. 2. Output voltage trimming Leave open if not used. Figure 3 Application Circuit for Trim pin Formula for Trim Resistor (part in broken line is the interior of models) +Vo +Vo up: RT= aRR2- 2a -R3 a=VoV’ r- eVfref R1 VRre1f R3 Trim VRre1f R3 RT Trim down: RT= aRR1- 1a -R3 a=VoV’ r- eVfref R2 R2 RT Note: Value for R1, R2, R3, and Vref refer to Table 4 R2 R: Trim Resistor T a: User-defined parameter, no actual meanings 0V 0V Vo': The trim up/down voltage Trimup Trimdown Vout R1 R2 R3 Vref (Vdc) (kΩ) (kΩ) (kΩ) (V) 3.3 4.801 2.863 15 1.24 Table 4 5 2.883 2.864 10 2.5 12 10.971 2.864 17.8 2.5 15 14.497 2.864 17.8 2.5 24 24.872 2.863 20 2.5 Note: 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: PYB20 │ DESCRIPTION: DC-DC CONVERTER date 02/07/2019 │ page 7 of 7 REVISION HISTORY rev. description date 1.0 initial release 06/26/2013 1.01 updated spec 08/15/2013 1.02 added CE safety approval 10/29/2013 1.03 updated spec 08/18/2014 1.04 added UL approval to some models 06/16/2015 1.05 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.