SRL16A-12W Miniature Surface Mount 16A 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: • 16A Output Current • Wide 6V - 14V Input Range • Efficiency to 94% • EN 60950 Approved (UL) • Miniature SMT Construction • Short Circuit Protected • Thermal Shutdown • Remote On/Off Control • Sequencing Capability • Industry Standard Footprint Input Parameter Conditions Input Voltage Range Under Voltage Lockout, Power Up Maximum Input Current Off Input Current Input Filter Input Reflected Ripple Current Min. VOUT 4.5V 6.0 6.5 VOUT 5.0V Turn On Voltage Threshold Turn Off Voltage Threshold Lockout Hysteresis Voltage IOUT = 100%, VIn = 0 to 14 VDC Input Idle Current Capacitive See Note 1 Typ. 12.0 12.0 5.0 4.0 1.0 Max. 14.0 14.0 Units VDC VDC 15.0 10 200 A mA 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 Power Good Signal (Optional) Short Circuit Protection Over Temperature Protection Overload Protection 50% Load Change Logic High 90 Continuous (Hiccup Mode) See Note 4 130 See Note 5 19.2 25 Max. Units ±1.5 ±0.2 ±0.5 75 30 200 ±0.03 110 % % % mV P-P mV RMS µSec %/°C %VOUT 32 °C A Max. Units General Parameter Isolation Voltage Switching Frequency Conditions Min. Not Isolated Fixed Typ. Min. Typ. 10 300 kHz Sequencing Parameter Sequencing Delay Time Sequencing Slew Rate Conditions dVSEQ/dt Power Up Power Down Tracking 0.1 Max. 1.0 200 400 Units mSec V/mSec mV Remote On/Off, See Note 6 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 Unit On Unit Off On/Off Current Conditions Min. Logic High Logic Low VON/VOFF = 0.0V 0.0 Typ. Max. Open or VIN 0.4 1 Units VDC mA Environmental 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 Input Model Voltage (VDC) Current (mA) Voltage Number Range Full-Load No-Load (VDC) 1,250 40 0.75 1,882 40 1.20 2,273 50 1.50 6.0 - 14.0 2,697 60 1.80 SRL16A-12W-5.0 2,963 60 2.00 3,663 65 2.50 4,731 75 3.30 6.5 - 14.0 7,092 95 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) 16.0 0.0 Fuse Rating Efficiency Capacitive Load Slow-Blow (%, Typ) 80 85 88 89 90 91 93 94 (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: SRL16A-12W 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 SRL16A-12W 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 Sequence: C2 0.01 µF See note on page 4 292 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 SRL16A-12W-5.0 - VIN = 12 VDC, VOUT = 5.0 VDC SRL16A-12W-5.0 - VIN = 12 VDC, VOUT = 3.3 VDC SRL16A-12W-5.0 - VIN = 12 VDC, VOUT = 2.5 VDC SRL16A-12W-5.0 - VIN = 12 VDC, VOUT = 2.0 VDC SRL16A-12W-5.0 - VIN = 12 VDC, VOUT = 1.8 VDC SRL16A-12W-5.0 - VIN = 12 VDC, VOUT = 1.5 VDC SRL16A-12W-5.0 - VIN = 12 VDC, VOUT = 1.2 VDC SRL16A-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 SRL16-12W 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. SRL16A-12W-5.0 VOUT (VDC) RTRIM (k) 0.75 Open 1.20 22.46 1.50 13.05 1.80 9.024 Sequencing SRL16A-12W-5.0 VOUT (VDC) RTRIM (k) 2.00 7.417 2.50 5.009 3.30 3.122 5.00 1.472 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 = 10, 500 - 1, 000 VOUT - 0.7525 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 SRL16A-12W 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. The outputs of multiple SRL16A-12W modules may be controled via the sequencing feature. When not using this feature, the SEQ input should be left open or tied to VIN. Connecting modules (as shown above), allows users to control the timing of the outputs of multiple modules. For proper sequencing, the input voltage is applied to the module. The On/Off input of each module is left open so that the module is on by default. A minimum 10 mS delay (after the input voltage is applied) is required before applying a voltage on the SEQ input. As a voltage is applied to the SEQ input, the module output voltage will track this control voltage (on a oneto-one volt basis) until the set-point voltage level is reached. To achieve a simultaneous shutdown of the modules, the SEQ input voltage is lowered in a controlled manner. The module output voltages will track this input below their set-point voltages on a one-to-one basis. The input voltage must be maintained within specified limits until the tracking and output voltages reach ground potential. Suggested Solder Reflow Profile 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 • Pin Connections Pin 1 2 3 4 Description +V Input Sense Sequence Common Pin 5 6 7 8 Description +V Output Trim Sense Power Good The power Good Signal is optional FAX: (781) 344-8481 • E-Mail: [email protected]