E Class Converters EHS20 – 1.2V Model OBSOLETE PRODUCT Model Parameter 1.2V Output Voltage Setpoint Units 1.18 – 1.22 Vdc 0.1% / 0.2% % Vo Output total regulation 1.16 – 1.24 Vdc Output adjust (note 4) 90-110 %Vo,nom Line/Load Regulation Max Remote-sense Comp. Output Ripple & Noise (note 2) 10% Max Output Current Efficiency (48V, Full load, 25C) Typ External Capacitance Transient Response (typ) (note 3) 25% step, 1A/μs V mVp-p 0-20 A 85% % 1,000-10,000 μF ΔVo 150 mV Ts 400 μs 1.5 – 1.8 V 25 A Over-voltage trip point (latching) Over-current trip point (non-latching) 100 Typ All specifications, waveforms, charts at Ta=25C, Vin=48V, unless otherwise specified For full details go to www.murata-ps.com/rohs www.murata-ps.com/support 1 EHS20-012-6200991518 E Class Converters Murata Power Solutions EHS20 – 1.2V Model Parameter Input Conditions Input Voltage (Vin) Reflected Ripple Current Inrush Transient Input Voltage Transient Undervoltage Lockout Isolation Temperature Protection Over-voltage lockout Input-Output Resistance; input-output Operating Ambient Storage Over-Temperature Physical Information Dimensions MTBF Safety Min. Typ. Max. Units 36 48 25 75 0.2 Vdc ‘mA p-p A2s 100 V 35 34 81 Vdc Vdc Vdc Vdc Mohm °C °C See note (1) 100mS 10% duty cycle Turn-on (non-latching)Turn-off (non-latching)Turn-off (non-latching)Measured on PCB 32 31 77 1500 10 -40 -40 90 125 130 °C 2.30”L x 0.82” W x 0.37”H (58.4 x 20.8 x 9.3 mm) Calculated at 40C ambient, (Bellcore) 1,000,000 Hrs EHS15/20 Series Demonstrated at 40C ambient with 90% confidence: 2,800,000 Hrs Complies with IEC/EN/CSA/UL 60950, provides basic insulation, input to output. c-UL-us (US and Canada) recognized, TUV certified (Bauart). www.murata-ps.com/support 2 EHS20-012-6200991518 E Class Converters Murata Power Solutions EHS20 – 1.2V Model EHS20-012 Thermal Derating EHS20-012 Thermal Derating Airflow from Vin to Vo, Tj = 120ºC Airflow from Vo(-) to Vo(+), Tj= 120ºC 25 25 20 Output Current [A] Output Current [A] 20 15 10 400 LFM 300 LFM 200 LFM 100 LFM 15 10 5 25 35 45 55 65 75 400 LFM 300 LFM 200 LFM 100 LFM 5 85 25 Ambient Temperature [ºC] 35 45 55 65 Ambient Temperature [ºC] 75 85 EHS20-012 Enable with Pre-Bias EHS20-012 Efficiency 95 90 85 Efficiency [%] 80 75 70 65 Vin=36V Vin=48V Vin=75V 60 55 Output Voltage @ 0.2 V/div., 2 ms/div. Prebias voltage =0.6 Vdc. Input Voltage 48 V Load = 0 A, Load capacitance = 10000 uF. 50 45 40 4 6 8 10 12 14 16 18 20 22 24 Iout [Adc] 5.10 Vnom ( 100 Rup %) 0.6 % Where % ( Vout : 1.2V model 510 Rup (1.2 V) 10.2 K % Vnom) 100 1000 and, Vout = Target output voltage Vnom Rdown ( % ) 510 Where 10.2 K % % Resistance (Kohms Trim Up/Down Formula EHS20-012 Trim-up and Trim-down Resistance Rdown (1.2 V) 100 ( Vnom Vout ) 100 Vnom 10 0% 2% 4% 6% Delta (%) 8% 10% www.murata-ps.com/support 3 EHS20-012-6200991518 E Class Converters Murata Power Solutions EHS20 – 1.2V Model EHS20- 012 Startup Sequence from Enable EHS20- 012 Startup Sequence from Vin Top Trace: Vout @ 0.5 V/div. Bot. Trace: Vin @ 50V/div. Horiz. @ 50 ms/div. Load: 20 A. Turn-on delay: 110mS Top Trace: Vout @ 0.5 V/div. Bot. Trace: Venable @ 2 V/div. Horiz. @ 5 ms/div. Load: 20 A, 10000 uF Turn-on delay: 4.38 ms EHS20-012 Transient Response 50-75% step ,1A/μs EHS20-012 Transient Response 50- 25% step, 1A/μs CH1: Vout AC coupled CH2 : Step up Current (2A/div) CH1: Vout AC coupled CH2 : Step down Current (2A/div) EHS20- 012 Input Reflected Ripple Current EHS20-012 Output Ripple Voltage, Io=20A Input Current @ 5 mA/div., 20 us/div. (9.2 mApp) Input Voltage: 48 V, Load Current: 20 A Note: see test circuit on following page. www.murata-ps.com/support 4 EHS20-012-6200991518 E Class Converters Murata Power Solutions EHS20 – 1.2V Model Notes: 1. Input Reflected Ripple is specified when measured with the filter shown below is ic L2 Vin 1 2u F 2 2 0 uF , E S R < 0.1 O h m s @ 1 00 k H z 33uF, E S R < 0 .7 O hm s @ 1 0 0 kH z DC-DC Converter RTN 2. Output Ripple and noise is specified when measured with a 10uF tantalum and a 1uF ceramic capacitor at the converter output pins 3. Transient response is specified with a 470uF tantalum capacitor at the output of the converter 4. Trim resistor connection: Rtrim-up connected from Vo adj to Vo(+), Rtrim –down connected from Vo adj to Vo(-). EHS20-012 Enable Pin Connection Table NEGATIVE LOGIC VERSION POSITIVE LOGIC VERSION Note: ENABLE POWER SUPPLY 0V < Venable < 0.8V (internal pull-up > 50Kohms @ 5V) 2.5V < Venable < 15V (external pull-up > 1Kohms) DISABLE POWER SUPPLY 2.5V < Venable < 15V (external pull-up > 1Kohms) 0V < Venable < 0.8V (internal pull-up > 50Kohms @ 5V) Power Supply has internal pull-up resistor. Enable pin is in a valid “high” state if left open-circuit. Safety considerations The EHS series of converters are certified to IEC/EN/CSA/UL 60950. If this product is built into information technology equipment, the installation must comply with the above standard. An external input fuse (5A to 30A recommended), must be used to meet the above requirements. The output of the converter [Vo(+)/Vo(-)] is considered to remain within SELV limits when the input to the converter meets SELV or TNV-2 requirements. The converters and materials meet UL 94V-0 flammability ratings. www.murata-ps.com/support 5 EHS20-012-6200991518 E Class Converters Murata Power Solutions EHS20 – 1.2V Model Part Number Designations This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2012 Murata Power Solutions, Inc. www.murata-ps.com/support 6 EHS20-012-6200991518