SRL10A-12 Miniature Surface Mount 10A Output, Switching POL Regulators Electrical Specifications Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice. Key Features: • 10A Output Current • Wide 9.0V - 14V Input Range • Efficiency to 95% • EN 60950 Approved (UL) • Miniature SMT Construction • Short Circuit Protected • Thermal Shutdown • Remote On/Off Control • Industry Standard Footprint Input Parameter Input Voltage Range Conditions Under Voltage Lockout, Power Up Maximum Input Current Off Input Current Turn On Delay Time Input Filter Input Reflected Ripple Current VOUT 4.5V Turn On Voltage Threshold Turn Off Voltage Threshold Lockout Hysteresis Voltage IOUT = 100%, VIn = 0 to 14 VDC Input Idle Current Min. 9.0 Typ. 12.0 8.0 7.7 0.3 Max. 14.0 VDC 7.0 10 Capacitive See Note 1 Units VDC 3.5 A mA mS 200 mA P-P Output Parameter Output Voltage/Current Output Voltage Tolerance Line Regulation Load Regulation Conditions Min. Typ. See Model Selection Guide VIN = Min to Max IOUT = 0% to 100% Ripple & Noise (20 MHz) See Note 2 Transient Recovery Time, See Note 3 Temperature Coefficient Short Circuit Protection Over Temperature Protection Overload Protection 50% Load Change Continuous (Hiccup Mode) See Note 4 120 See Note 5 15 17 Max. Units ±1.5 ±0.2 ±0.5 50 20 200 ±0.03 % % % mV P-P mV RMS µSec %/°C 20 °C A Max. Units General Parameter Isolation Voltage Switching Frequency Remote On/Off, See Note 6 Parameter Unit On Unit Off On/Off Current Conditions Min. Not Isolated Fixed Conditions Min. Logic High Logic Low VON/VOFF = 0.0V 0.0 Typ. 300 kHz Typ. Max. Open or VIN 0.4 1 Units VDC mA Environmental MicroPower Direct 292 Page Street Suite D Stoughton, MA 02072 USA T: (781) 344-8226 F: (781) 344-8481 E: [email protected] W: www.micropowerdirect.com Parameter Operating Temperature Range Storage Temperature Range Cooling Humidity Physical Size Weight Conditions Min. Typ. Max. -40 +25 +85 -55 +125 Free Air Convection (See Derating Curves) RH, Non-condensing 93 Ambient Units °C °C % 1.3 x 0.53 x 0.346 Inches (33.0 x 13.46 x 8.8 mm) 0.299 Oz (8.5g) Reliability Specifications Parameter MTBF Safety Standards Conditions Min. Typ. MIL HDBK 217F, 25°C, Gnd Benign 980 UL 60950, EN 60950 www.micropowerdirect.com Max. Units kHours www.micropowerdirect.com Model Selection Guide Model Number SRL10A-12-5.0 Input Voltage (VDC) Current (mA) Voltage Range Full-Load No-Load (VDC) 992 40 0.75 1,163 50 1.20 1,404 50 1.50 1,666 60 1.80 9.0 - 14.0 1,823 60 2.00 2,264 60 2.50 2,956 70 3.30 4,385 70 5.00 Notes: 1. Measured over a bandwidth of 5 Hz to 20 MHz using a 1 µH inductor. 2. Output ripple is measured at 20 MHz bandwidth using a 1.0 µF ceramic capacitor and a 10 µF tantalum capacitor connected in parallel as close to the output terminals as possible. 3. Transient recovery is measured to within a 200 mV error band for a 50% load change. 4. These units include a non-latching over temperature protection circuit. If the temperature exceeds approximately 120°C at the monitored “hot spot”, the unit will be shut down. When the temperature decreases, the unit will automatically restart. See page 3 for temperature measurement information. 5. These units will provide up to 150% of rated current. In the event of an over current fault, the unit will go into hiccup mode until the fault is removed. 6. Standard units feature an active high remote control input. See the note and diagram at right. 7. These units do not include an internal fuse. It is recommended that an external slow-blow fuse be used with a rating as shown in the table above. Output Current Current (A, Max) (A, Min) 10.0 0.0 Fuse Rating Efficiency Capacitive Load Slow-Blow (%, Typ) 82 86 89 90 91 92 93 95 (µF Max) (A) 8,000 20 Remote On/Off These units include an active high On/OFF control input. The unit is “ON” if the input to the control pin (pin 2) is high; or if the pin is left open (or floating). The signal level of the control input is referenced to ground. A recommended drive circuit for the control pin is shown at left. The resistors R1 & R2 have been added to help reduce possible false triggering of the control input due to leakage currents. Units are available with an active low control input. With this input, the unit will remain off if the control input remains above 2.8 VDC. For more information on the active low option, contact the factory. Typical Connection Notes: Fuse: Input Filter: SRL10A-12 regulators do not include an internal fuse. For safety and protection, a external slow-blow fuse should be placed in the input (+VIN) line. A 20A fuse is recommended. The unit must be connected to a low AC impedance source, and to avoid loop stability issues, the source inductance should also be low. To significantly reduce ripple caused by the switching action of the POL, the SRL10A-12 includes onboard filtering. However, adding input capacitors C1 and C2 will further reduce ripple currents (C1) and high frequency noise spikes (C2). These capacitors should be placed as close to the input pins as possible (see board layout at right). It is recommended that low ESR (<100 m) and low ESL ceramic capacitors be used. Recommended values are: C1 33 µF to 250 µF C2 0.01 µF 292 Page Street Ste D Stoughton, MA 02072 Remote ON/OFF: See note above Output Trim: See note on page 4 Remote Sense: The remote sense helps regulate the output voltage at the point of load by minimizing the effects of distribution losses. The voltage between the sense pin (Pin 3) and the point of load should not exceed 500 mV. When using the remote sense function, the output voltage level may rise. Care must be taken not to exceed the maximum rated output power of the regulator. When not in use, the remote sense pin should be tied to the output pin of the regulator. Output Filter: Output filtering is not required, but may be used to further reduce output ripple & noise; or to adjust the transient response time of the unit. Care must be taken not to exceed 8,000 µF, the maximum value of output capacitance the unit is rated for. The values given in the connection diagram are typical for light filtering. • TEL: (781) 344-8226 • FAX: (781) 344-8481 • E-Mail: [email protected] www.micropowerdirect.com Derating Curves SRL10A-12W-5.0 - VIN = 12 VDC, VOUT = 5.0 VDC SRL10A-12W-5.0 - VIN = 12 VDC, VOUT = 3.3 VDC SRL10A-12W-5.0 - VIN = 12 VDC, VOUT = 2.5 VDC SRL10A-12W-5.0 - VIN = 12 VDC, VOUT = 2.0 VDC SRL10A-12W-5.0 - VIN = 12 VDC, VOUT = 1.8 VDC SRL10A-12W-5.0 - VIN = 12 VDC, VOUT = 1.5 VDC SRL10A-12W-5.0 - VIN = 12 VDC, VOUT = 1.2 VDC SRL10A-12W-5.0 - VIN = 12 VDC, VOUT = 0.75 VDC Temperature Measurement These switching regulators may be used in a wide variety of thermal environments, but must be properly cooled to ensure long reliable operation. The derating curves shown above are approximations of the ambient temperature and airflow required to maintain the switching regulator temperature below its maximum rating. Airflow should move across the unit, as shown above. Proper cooling can be verified by measuring the temperature at the reference point (as shown at left). The thermocouple should be mounted approximately 0.5 in. off the unit board. The temperature at this location should not exceed 120°C. MicroPower Direct • 292 Page Street Ste D Stoughton, MA 02072 • TEL: (781) 344-8226 • FAX: (781) 344-8481 • E-Mail: [email protected] www.micropowerdirect.com Output Voltage Trim The output voltage level of the SRL10A-12 series is adjustable over a wide range by the simple addition of an external resistor. This trim resistor is connected between the circuit common and the trim input, as shown in the diagram at left. The required resistor value for various output levels is given in the table above. To calculate the correct value for a different output level, the formula is: R TRIM = SRL10A-12-5.0 VOUT (VDC) RTRIM (k) 0.75 Open 1.20 22.33 1.50 13.00 1.80 9.00 2.00 7.40 2.50 5.00 3.30 3.12 5.00 1.47 10, 500 - 1, 000 VOUT - 0.75 Where: RTRIM = The external trim resistor VOUT = The desired output voltage If a trim resistor is not connected, the output is 0.75 VDC. Suggested Board Layout This diagram illustrates a simple board layout for use with the SRL10A-12 series. As recommended, external components are placed as close to the unit as possible. To help shield external circuitry, the ground plane has been extended under the unit. Any signal traces should not be routed underneath the unit (unless they are on a layer under the ground plane) to avoid unwanted noise interference. Pin Connections Pin 1 2 4 Suggested Solder Reflow Profile Description +V Input Sense Common Pin 5 6 7 Description +V Output Trim Sense Mechanical Dimensions Notes: • All dimensions are typical in inches (mm) • Tolerance x.xx = ±0.02 (±0.50) MicroPower Direct We Power Your Success - For Less! 292 Page Street Ste D Stoughton, MA 02072 • TEL: (781) 344-8226 • FAX: (781) 344-8481 • E-Mail: [email protected]