PT4120 Series 20-W 48-V Input Isolated DC/DC Converter SLTS092B (Revised 2/26/2002) Features * Input Voltage Range: 36V to 75V * 20W Rated * 82% Efficiency * 1500 VDC Isolation * Low Profile (8.5 mm) * Small Footprint: 1.52in x 1.73in * Remote On/Off * * * * * * * Short Circuit Protection Over Temperature Shutdown Under-Voltage Lockout UL1950 Recognized CSA 22.2 950 Certified EN60950 Approved 4x106 Hrs MTBF Description Ordering Information Pin-Out Information The PT4120 power modules are a series of isolated DC/DC converters housed a lowprofile package. Rated for 20 watts or 5A, the series includes standard output voltages ranging from as low as 1.5VDC to 15VDC. The output may be adjusted 10% of nominal. These converters are ideal for Telecom, Industrial, Computer, and other distributed power applications that require input-tooutput isolation. Using multiple PT4120 modules, system designers can implement a complete custom power supply solution. The flexibility of full isolation also allows the input or output to be configured for negative voltage operation. The PT4120 series requires no additional components for proper operation. PT4121H PT4122H PT4123H PT4124H PT4125H PT4126H PT4127H PT4128H PT4129H Pin = 3.3V/5A (16.5W) = 5.0V/4A = 12.0V/16A = 15.0V/13A = 5.2V/3*8A = 1.5V/5A (7.5W) = 1.8V/5A (9W) = 2.5V/5A (12.5W) = 1.65V/5A (8*25W) Order Suffix Package Code * A C Horizontal SMD (EGD) (EGE) * Previously known as package style 710. (Reference the applicable package code drawing for the dimensions and PC board layout) Standard Application +VIN -VIN 3 +VOUT 4 -VOUT PT4120 LOAD 2 1 Remote On/Off 5 6 Q1 BSS138 For technical support and more information, see inside back cover or visit www.ti.com VOAdj Remote On/Off 2 -Vin 3 +Vin 4 -Vout 5 +Vout 6 Vout Adjust For further information, see application notes. PT Series Suffix (PT1234x ) Case/Pin Configuration Function 1 PT4120 Series 20-W 48-V Input Isolated DC/DC Converter Specifications (Unless otherwise stated, Ta =25C, V in =48V, Cout =0F, and Io =Io max) Characteristic Symbol Output Current Io Conditions Over Vin range Input Voltage Range Set Point Voltage Tolerance Vin Vo tol Over Io Range Temperature Variation Line Regulation Regtemp Regline -40 Ta +85C Over Vin range Load Regulation Regload Over Io range Total Output Voltage Variation Votot Includes set-point, line load, -40 Ta +85C Efficiency Min Vo = 15V Vo = 12V Vo =5.0V Vo 3.3V Vo 5.0V Vo 3.3V Vo 5.0V Vo 3.3V Vo 5.0V Vo 3.3V Vo 5.0V Vo 3.3V Vo = 15V Vo = 12V Vo =5.0V Vo =3.3V Vo =1.8V Vo 5.0V Vo 3.3V Vo Ripple (pk-pk) Vr 20MHz bandwidth Transient Response ttr 0.1A/s, load step 50% to 100% Iomax Vo over/undershoot Vo 5.0V Vo 3.3V Vtr Short Circuit Current Switching Frequency Isc s Under-Voltage Lockout Remote On/Off (Pin 1) Input High Voltage Input Low Voltage Input Low Current UVLO VIH VIL IIL Over Vin range Referenced to -Vin (pin 2) Standby Input Current Internal Input Capacitance External Output Capacitance Isolation Voltage Capacitance Resistance Operating Temperature Range Storage Temperature Reliability Iin standby Cin Cout pins 1 & 2 connected Ta Ts MTBF Mechanical Shock -- Mechanical Vibration -- Weight Flammability -- -- Over Vin range -- Per Bellcore TR-332 50% stress, Ta =40C, ground benign Per Mil-Std-883D, method 2002.3, 1mS, half-sine, mounted to a fixture Per Mil-Std-883D, method 2007.2, 20-2000Hz, soldered in a PC board -- Materials meet UL 94V-0 Between +Vo and -Vo Input to output Vo 12.0V Vo 5.2V PT4120 SERIES Typ Max Units 0.1 (1) 0.1 (1) 0.1 (1) 0.1 (1) 36.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 600 800 -- -- -- -- -- 48.0 1 -- 0.5 0.2 7 0.4 13 2 67 86 83 82 78 67 0.5 15 100 3.0 150 2xIomax 650 850 31 1.3 1.6 4.0 5.0 75.0 1.5 50 -- 1.0 33 1.0 33 -- -- -- -- -- -- -- -- -- -- -- -- -- 700 900 -- 2.5 -0.2 -- -- -- 0 1500 -- 10 -40 -40 -- -- -10 7 0.5 -- -- 1100 -- -- -- 7.0 (2) +0.8 - 50 -- 200 -- -- -- +85 (3) +125 A mA F F V pF M C C 4.0 -- -- 106 Hrs -- 500 -- G's -- 15 -- G's -- 23 -- grams A VDC %Vo mV %Vo %Vo mV %Vo mV %Vo mV % %Vo mVpp s %Vo mV A kHz V V Notes: (1) The DC/DC converter will operate at no load with reduced specifications. (2) The Remote On/Off (pin 1) has an internal pull-up, and if it is left open circuit the PT4120 will operate when input power is applied. Refer to the application notes for interface considerations. (3) See Safe Operating Area curves or contact the factory for the appropriate derating. For technical support and more information, see inside back cover or visit www.ti.com Typical Characteristics PT4120 Series 20-W 48-V Input Isolated DC/DC Converter PT4121, 3.3 VDC PT4122, 5.0 VDC (See Note A) PT4123, 12.0 VDC (See Note A) Efficiency vs Output Current Efficiency vs Output Current 90 Efficiency vs Output Current 90 90 36.0V 48.0V 75.0V 70 60 85 80 Vin 75 36.0V 48.0V 75.0V 70 65 60 Efficiency - % Vin Efficiency - % Efficiency - % 85 80 55 50 1 2 3 4 5 0.5 1 1.5 2.5 3 3.5 0 75.0V 48.0V 36.0V 6 4 0 4 Vin 10 75.0V 48.0V 36.0V 8 6 5 1 1.5 3 3.5 3 2 0 0 3 4 5 0.4 75.0V 48.0V 36.0V 60 50 40 30 20 1 1.5 2 2.5 3 3.5 5 1.6 Vin 75.0V 48.0V 36.0V 2 4 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Iout (A) Safe Operating Area, Vin =48V (See Note B) 90 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 4 1.4 0 0.5 Ambient Temperature (C) 200LFM 120LFM 60LFM Nat conv 1.2 3 Safe Operating Area, Vin =48V (See Note B) Ambient Temperature (C) Airflow 70 1 1 90 80 0.8 4 Iout (A) Safe Operating Area, Vin =48V (See Note B) 0.6 5 Vin 0 90 Iout (A) 0.2 Power Dissipation vs Output Current 2 0 3 20 6 3 1 2 75.0V 48.0V 36.0V 30 Iout (A) 4 1 1 Vin 4 Pd - Watts 75.0V 48.0V 36.0V Pd - Watts Pd - Watts 2.5 5 Vin 1.6 40 Power Dissipation vs Output Current Iout (A) Ambient Temperature (C) 2 6 4 1.4 50 Iout (A) 5 1.2 0 0.5 Iout (A) Power Dissipation vs Output Current 1 10 0 6 0.8 60 12 0 3 0.6 Ripple vs Output Current 2 0 0.4 70 4 2 2 0.2 Iout (A) Ripple - mV 8 Ripple - mV Vin 1 60 4 14 10 Ripple - mV 2 16 0 65 Ripple vs Output Current Ripple vs Output Current 2 36.0V 48.0V 75.0V 70 Iout (A) 12 1 Vin 75 50 0 Iout (A) 0 80 55 50 0 (See Note A) 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 0 1 2 3 4 Iout (A) 0 0.25 0.5 0.75 1 Iout (A) Note A: Characteristic data has been developed from actual products tested at 25C. This data is considered typical data for the Converter. Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures For technical support and more information, see inside back cover or visit www.ti.com 1.25 1.5 1.75 Application Notes PT4120/4140 Series Using the Remote On/Off Function on the PT4120/ PT4140 Series of Isolated DC/DC Converters For applications requiring output voltage on/off control, the PT4120/4140 series of DC/DC converters incorporate a remote on/off function. This function may be used in applications that require battery conservation, power-up/ shutdown sequencing, and/or to co-ordinate the powerup of the regulator for active in-rush current control. (See the related application note, AN21). This function is provided by the Remote On/Off control, pin1. If pin 1 is left open-circuit, the converter provides a regulated output whenever a valid source voltage3 is applied between +Vin(pin 3), and -Vin (pin 2). Applying a low-level ground signal 1 to pin 1 will disable the regulator output 5. Table 1 provides details of the threshold requirements for the Remote On/Off pin. Figure 1 shows how a discrete MOSFET (Q1) 4, may be referenced to the negative input voltage rail and used with this control input. Table 1 Inhibit Control Thresholds Parameter min max Enable (VIH) 2.5V (Open Circuit) 2, 4 Disable (VIL) -0.3V 0.8V Notes: 1. The on/off control uses -Vin (pin 2), the primary side of the converter as its ground reference. All voltages specified are with respect to -Vin. 2. The on/off control internal circuitry is a high impedance 10A current source. The open-circuit voltage may be as high as 8.3Vdc. 3. The PT4120/40 series incorporates an "Under Voltage Lockout" (UVLO) function. This function automatically inhibits the converter output until there is sufficient input voltage for the converter to produce a regulated output. Table 2 gives the applicable UVLO thresholds. Table 2 UVLO Thresholds Series UVLO Threshold PT4120 PT4140 31V Typical 15V Typical 6. Keep the on/off transition to less than 1ms. This prevents erratic operation of the ISR, whereby the output voltage may drift un-regulated between 0V and the rated output during power-up. Figure 1 +V o 3 +V in +V in +Vout 5 PT4121 2 -V in -V out Remote On/Off 1 4 V o (adj) 6 -V o Q1 BSS138 Inh Note 2 -V in Turn-On Time: The converter typically produces a fully regulated output voltage within 50ms after the application of power, or the removal of the low voltage signal 6 from the Remote On/Off pin. The actual turn-on time will vary with the input voltage, output load, and the total amount of capacitance connected to the output. Using the circuit of Figure 1, Figure 2 shows the output voltage and input current waveforms of a PT4121 after Q1 is turned off. The turn off of Q1 corresponds to the drop in Q1 Vgs voltage. The waveforms were measured with a 48Vdc input voltage, and 2.75-A resistive load. Figure 2 Vout (2V/Div) Vin Range 36 - 75V 18 - 40V Iin (0.2A/Div) 4. The Remote On/Off input of the PT4120/40 series regulators must be controlled with an open-collector (or open-drain) discrete transistor or MOSFET. Do not use a pull-up resistor. 5. When the converter output is disabled, the current drawn from the input supply is typically reduced to 8mA (16mA maximum). Q1 Vgs (10V/Div) HORIZ. SCALE: 5ms/Div For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT4120/4140 Series Adjusting the Output Voltage of the PT4120/ PT4140 Series of Isolated DC/DC Converters The factory pre-set output voltage of Power Trends' PT4120 and PT4140 series of isolated DC/DC converters may be adjusted within 10% of nominal. Adjustment is made from the secondary side of the regulator1 with a single external resistor. For the input voltage range specified in the data sheet Table 1 gives the allowable adjustment range for each model, as Vo (min) and Vo (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor, R2 between pin 6 (Vo adjust), and pin 4 (-Vout). 4. Never connect capacitors to Vo adjust. Any capacitance added to the Vo adjust control pin will affect the stability of the ISR. The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. (R1) = Ko (Va - Vr) Vr (Vo - Va) - Rs k R2 = Ko (Va - Vo) - Rs k Adjust Down: Add a resistor (R1), between pin 6 (Vo adjust) and pin 5 (+Vout). Refer to Figure 1 and Table 2 for both the placement and value of the required resistor, (R1) or R2. Notes: 1. The PT4120 and PT4140 series of DC/DC converters incorporate isolation between the Vin and Vo terminals. Adjustment of the output voltage is made to the regulation circuit on the secondary or output side of the converter. 2. The maximum rated output power for this series is 20W. An increase in the output voltage may therefore require a corresponding reduction in the maximum output current (see Table 1). The revised maximum output current must be determined as follows:Io(max) = 20 A, Va = Original output voltage = Adjusted output voltage = Reference voltage (Table 1) = Multiplier constant (Table 1) = Internal series resistance (Table 1) Where Vo Va Vr Ko Rs Figure 1 + Vo + V in (R1) Adj Down 3 +V in +V out PT4120/40 2 -V in -V out Remote On/Off or 5A, whichever is less. 5 1 -V in 4 R2 Adj Up V o (adj) 6 -V o Where Va is the adjusted ouput voltage. 3. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the ISR as possible. Table 1 DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # 48V Bus 24V Bus Max Current 2 Vo(nom) Va(min) Va(max) Vr ) Ko (V*k ) Rs (k PT4126 PT4146 5A 1.5 1.35 1.65 1.225 67.07 43.2 PT4129 5A 1.65 1.49 1.81 1.225 63.9 66.5 PT4127 PT4147 5A 1.8 1.62 1.98 1.225 69.7 110.0 PT4128 PT4148 5A 2.5 2.25 2.75 1.225 64.2 187.0 PT4121 PT4141 5A 3.3 2.95 3.65 1.225 69.3 187.0 For technical support and more information, see inside back cover or visit www.ti.com PT4122 PT4142 4A 5.0 4.5 5.5 2.5 125.2 187.0 PT4125 3.8A 5.2V 4.75 5.75 2.5 134.7 243.0 PT4123 PT4143 1.6A 12.0 10.8 13.2 2.5 139.8 110.0 PT4124 PT4144 1.3A 15.0 13.5 16.5 2.5 137.6 90.9 Application Notes continued PT4120/4140 Series Table 2 DC/DC CONVERTER SERIES ADJUSTMENT RESISTOR VALUES Series Pt # 48V Bus 24V Bus Vo(nom) Va(req'd) 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 R1 = (Blue) PT4126 PT4146 1.5Vdc PT4127 PT4147 1.8Vdc PT4128 PT4148 2.5Vdc PT4121 PT4141 3.3Vdc PT4122 PT4142 5.0Vdc Va(req'd) (2.8)k (53.2)k (204.0)k 1.3M 627.0k 404.0k 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 (51.7)k (161.0)k (489.0)k 1.28M 587.0k 355.0k (26.5)k (92.9)k (203.0)k (425.0)k (1.09)M 1.09M 450.0k 237.0k 131.0k 67.7k (90.7)k (146.0)k (224.0)k (341.0)k (536.0)k (926.0)k (2.09)M PT4123 PT4143 12.0Vdc PT4124 PT4144 15.0Vdc Va(req'd) (12.6)k (40.3)k (75.0)k (120.0)k (179.0)k (262.0)k (387.0)k (595.0)k (1.01)M 1.06M 645.0k 437.0k 312.0k 229.0k 169.0k 125.0k 90.2k 62.4k 10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 13.2 13.5 13.6 13.8 14.0 14.2 14.4 14.6 14.8 15.0 15.2 15.4 15.6 15.8 16.0 16.5 (276.0)k (365.0)k (497.0)k (719.0)k (1.16)M 588.0k 239.0k 123.0k 64.6k 29.7k 6.4k (312.0)k (345.0)k (427.0)k (542.0)k (713.0)k (1.0)M (1.57)M 597.0k 253.0k 138.0k 81.0k 46.6k 0.8k 1.19M 502.0k 272.0k 158.0k 88.7k 42.7k 9.9k R2 = Black For technical support and more information, see inside back cover or visit www.ti.com PACKAGE OPTION ADDENDUM www.ti.com 13-Aug-2011 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) PT4121C NRND DIP MODULE EGE 6 16 Pb-Free (RoHS) Call TI Level-1-215C-UNLIM PT4122A NRND DIP MODULE EGD 6 16 Pb-Free (RoHS) Call TI N / A for Pkg Type PT4122C NRND DIP MODULE EGE 6 16 Pb-Free (RoHS) Call TI Level-1-215C-UNLIM PT4123A NRND DIP MODULE EGD 6 16 Pb-Free (RoHS) Call TI N / A for Pkg Type PT4124A NRND DIP MODULE EGD 6 16 Pb-Free (RoHS) Call TI N / A for Pkg Type PT4124C NRND DIP MODULE EGE 6 16 Pb-Free (RoHS) Call TI Level-1-215C-UNLIM PT4126A NRND DIP MODULE EGD 6 16 Pb-Free (RoHS) Call TI N / A for Pkg Type (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. 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