RB_T-2W series Single output 2W DC/DC converters, fixed input isolated & unregulated ultraminiature SMD package RoHS multi-country patent protection FEATURES APPLICATIONS High efficiency up to 82% Single voltage output ■ SMD package style ■ Industry standard pin-out ■ UL94-V0 package ■ No heat sink required ■ 1 kVDC isolation ■ High power density ■ Temperature range: -40°C~+85°C ■ No external component required ■ Low cost ■ Custom service available ■ RoHS compliance The RB_T-2W series is specially designed for applications where a single power supply is isolated from the input power supply in a distributed power supply system on a circuit board. ■ ■ MODEL SELECTION RB0505T-2W These products apply to: ■ Applications, where the voltage of the input power supply is fixed (voltage variation < ±10%). ■ Where isolation is necessary between input and output (isolation voltage = 1000VDC). ■ Where the regulation of the output voltage and the output ripple noise are not demanding - such as purely digital circuits ordinary low frequency analog circuits and IGBT power device driving circuits. These products don´t apply to: ■ Applications, where the input supply voltage varied (variation < ±10%). ■ Where the isolation voltage between input and output is required to be > 1000 VDC. ■ Circuits, in which the output voltage regulation is demanding. ■ When the actual output power is less than 0.25W the RB_T-W2 series is recommended. Rated power Package style Output voltage Input voltage Product series MODEL SELECTION GUIDE Part Number RB0505T-2W RB0509T-2W RB0512T-2W RB0515T-2W RB1209T-2W RB1212T-2W RB1215T-2W RB1515T-2W RB2405T-2W RB2415T-2W RB2424T-2W Input Voltage (VDC) Nominal Range 5 5 5 5 12 12 12 15 24 24 24 4.5~5.5 4.5~5.5 4.5~5.5 4.5~5.5 10.8~13.2 10.8~13.2 10.8~13.2 13.5~16.5 21.6~26.4 21.6~26.4 21.6~26.4 Output Voltage (VDC) 5 9 12 15 9 12 15 15 5 15 24 Output Current (mA) Max. Min. 400 222 167 133 222 167 133 133 400 133 83 40 23 17 14 23 17 14 14 40 14 8 Efficiency (% typ.) 75 75 76 77 75 76 77 81 77 80 82 COMMON SPECIFICATIONS Continuous short circuit protection Temperature rise at full load Cooling Operating temperature range Storage temperature range Lead temperature Storage humidity range Case material MTBF Automatic recovery 25°C max., 15°C typ. Free air convection -40°~+85°C -55°~+125°C 300°C < 95% plastic (UL 94-V0) > 3.500.000 hours ISOLATION SPECIFICATIONS Item Isolation voltage Isolation resistance Isolation capacitance Test conditions Tested for 1 minute Test at 500 VDC Min. 1000 1000 15 Unit VDC MOhm pF OUTPUT SPECIFICATIONS Output power Line regulation For Vin change of 1% min. 0.2W, max. 2W 1.2% Load regulation / Output voltage accuracy 10% to 100% load (3.3V, 5V output) 10% to 100% load (12V output) 10% to 100% load (15V output) See tolerance envelope graph 12.8%, 8.3% typ., 15% max. 6.8% typ., 15% max. 6.3% typ., 15% max. Temperature drift Output ripple Switching frequency Switching frequency ±0.03 max. %/°C 20 MHz Bandwidth Full load, nominal input Full load, nominal input (RB2424T-2W) 100% full load 100 mVp-p typ., 150 max. 200 KHz 400 KHz Note: All specification measured at TA = 25°C, humidity < 75%, nominal input voltage and rated output load unless otherwise specified. See below recommended circuits for more details TYPICAL CHARACTERISTICS PIN CONNECTIONS & RECOMMENDED FOOTPRINT DETAILS RBXXXX_T-2W OUTLINE DIMENSIONS RBXXXX_T- Note: All pins on a 2.54 mm pitch; all pin diameters are 0.50 mm; all dimensions in mm. Overload Protection Under normal operating conditions the output circuit of these products has no protection against over-current and short circuits. The simplest method is to connect a self-recovery fuse in series at the input end or add a circuit breaker to the circuit. Output voltage regulation and over-voltage protection circuit The simplest device for output voltage regulation, over voltage and over current protection is a linear voltage regulator with overheat protection that is connected to the input or output end in series (see figure 2). APPLICATION NOTES Filtering In some circuits, which are sensitive to noise and ripple, a filtering capacitor may be added to the DC/DC output end and input end to reduce the noise and ripple. However, the capacitance of the output filter capacitor must be proper. If the capacitance is too big, a startup problem might arise. For every channel of output, provided the safe and reliable operation is ensured, the greatest capacitance of its filter capacitor sees the external capacitor table. To get an extremely low ripple, an „LC“ filtering network may be connected to the input and output ends of the DC/DC converter, which may produce a more significant filtering effect. It should also be noted that the inductance and the frequency of the „LC“ filtering network should be staggered with the DC/DC frequency to avoid mutual interference (see figure 1). Requirement on output load To ensure this module can operate efficiently and reliably, a minimum load is specified for this kind of DC/DC converter in addition to a maximum load (namely full load). During operation, make sure the specified range of input voltage is not exceeded, the minimum output load is not less than 10% of the full load and that this product should never be operated under no load! If the actual output power is very small please connect a resistor with proper resistance at the output end in parallel to increase the load, or use our company´s products with a lower rated output power (RB_T-1W series). RSG Electronic Components GmbH ■ Sprendlinger Landstr. 115 ■ D-63069 Offenbach / Germany Tel. +49.69.984047-0 ■ Fax +49.69.984047-77 ■ [email protected] ■ www.rsg-electronic.de Änderungen vorbehalten / subject to change without notice.