1-1-3 DC/DC Converter ICs SI-8000S Series Full-Mold, Separate Excitation Step-down Switching Mode ■Features ■Lineup • Compact full-mold package (equivalent to TO220) Part Number SI-8033S SI-8050S SI-8090S SI-8120S SI-8150S VO(V) 3.3 5.0 9.0 12.0 15.0 IO(A) • Output current: 3.0A • High efficiency: 79 to 91% 3.0 ■Absolute Maximum Ratings • Requires only 4 discrete components Parameter Symbol Ratings VIN 43* V PD1 18(With infinite heatsink) W PD2 1.5(Without heatsink, stand-alone operation) W Tj +125 °C Storage Temperature Tstg –40 to +125 °C SW Terminal Applied Reverse Voltage VSW –1 V Thermal Resistance(junction to case) θ j-c 5.5 °C/W • Internally-adjusted phase correction and output voltage DC Input Voltage • Built-in reference oscillator (60kHz) Power Dissipation • Built-in overcurrent and thermal protection circuits Junction Temperature • Built-in soft start circuit (Output ON/OFF available) Unit *35V for SI-8033S ■Applications • Power supplies for telecommunication equipment • Onboard local power supplies ■Recommended Operating Conditions Ratings Parameter Symbol SI-8033S SI-8050S SI-8090S SI-8120S SI-8150S 5.5 to 28 7 to 40 12 to 40 15 to 40 18 to 40 Unit DC Input Voltage Range VIN Output Current Range IO 0 to 3.0 A Tjop –30 to +125 °C Operating Junction Temperature Range V ■Electrical Characteristics (Ta=25°C) Ratings Parameter Symbol SI-8000S*1 Output Voltage SI-8000SS VO SI-8033S min. typ. 3.17 3.234 Conditions Conditions Oscillation Frequency Line Regulation Load Regulation Temperature Coefficient of Output Voltage Overcurrent Protection Starting Current Soft Start Pin*2 f Conditions Conditions VSSL Outflow Current at Low Voltage ISSL typ. max. min. typ. max. min. typ. max. 3.30 3.43 4.80 5.00 5.20 8.55 9.00 9.45 11.50 12.00 12.50 14.25 15.00 15.75 3.30 3.366 4.90 5.00 5.10 VIN=21V, IO=1.0A ICs VIN=24V, IO=1.0A VIN=25V, IO=1.0A 79 84 88 90 91 VIN=15V, IO=1.0A VIN=20V, IO=1.0A VIN=21V, IO=1.0A VIN=24V, IO=1.0A VIN=25V, IO=1.0A 60 60 60 60 60 VIN=15V, IO=1.0A VIN=20V, IO=1.0A VIN=21V, IO=1.0A VIN=24V, IO=1.0A VIN=25V, IO=1.0A 80 40 100 50 120 60 130 60 % kHZ 130 VIN=15 to 30V, IO=1.0A VIN=18 to 30V, IO=1.0A VIN=21 to 30V, IO=1.0A 10 10 10 10 30 VIN=15V, IO=0.5 to 1.5A VIN=20V, IO=0.5 to 1.5A ±0.5 40 VIN=21V, IO=0.5 to 1.5A ±0.5 3.1 15 40 40 VIN=24V, IO=0.5 to 1.5A ±1.0 3.1 3.1 VIN=20V VIN=21V VIN=24V VIN=25V 0.2 25 0.2 25 0.2 25 0.2 25 0.2 25 15 35 Conditions 15 35 15 mV mV/°C ±1.0 3.1 VIN=15V 35 mV 40 VIN=25V, IO=0.5 to 1.5A ±1.0 3.1 *1:“S” may be printed to the right of the marking (except SI-8090S, SI-8120S, SI-8150S). *2:Pin 5 is a soft start pin. Soft start at power on can be performed with a capacitor connected to this pin. The output can also be turned ON/OFF with this pin. The output is stopped by setting the voltage of this pin to VSSL or lower. Soft-start pin voltage can be changed with an open-collector drive circuit of a transistor. When using both the soft-start and ON/OFF functions together, the discharge current from C3 flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the transistor if C3 capacitance is large. The ON/OFF pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited. If this pin is not used, leave it open. 46 V VIN=20V, IO=1.0A VIN=10 to 30V, IO=1.0A Conditions Low-Level Voltage Unit min. 10 ∆VO/∆Ta IS1 SI-8150S max. VIN=8 to 28V, IO=1.0A ∆VOLOAD Conditions SI-8120S typ. 25 ∆VOLINE SI-8090S min. VIN=15V, IO=1.0A η Efficiency SI-8050S max. 35 15 A V 35 VSSL=0.2V µA SI-8000S SI-8000S SI-8000S 5 ON/OFF 5 ON/OFF 5 ON/OFF C3 VOUT. ON/OFF Soft start C3 Soft start +VOUT. ON/OFF SI-8000S Series ■External Dimensions (TO220F-5) (Unit : mm) ±0.2 4.2 2.8±0.2 ±0.2 (17.9) 16.9±0.3 4.0±0.2 7.9±0.2 φ 3.2±0.2 0.5 10.0 Pin Assignment q VIN w SWOUT e GND r VOS t S.S (2.0) 2.6±0.1 0.95±0.15 (8.0) (4.6) +0.2 0.85 –0.1 +0.2 0.45 –0.1 P1.7±0.7×4=6.8±0.7 3.9±0.7 (4.3) 8.2±0.7 Plastic Mold Package Type Flammability: UL94V-0 Product Mass: Approx. 2.3g Forming No. 1101 1 2 3 4 5 ■Block Diagram VIN 1 2 SWOUT OCP Reg. OSC Reset Drive Comp. TSD 4 VOS Amp. VREF 5 S.S. 3 GND ■Typical Connection Diagram VIN 1 L1 2 VIN SI-8000S + VO SWOUT D1 + C1 C2 VOS S.S GND 5 3 C1,2 : 1000µF L1 : 150µH D1 : RK46(Sanken) 4 GND GND ■Ta-PD Characteristics PD=VO•IO 20 Power Dissipation PD (W) Infinite heatsink 15 With Silicone Grease Heatsink: Aluminum 200×200×2mm (2.3°C/W) 100×100×2mm 10 (5.2°C/W) 5 Without heatsink 0 –25 0 25 50 75 100 –VF•IO 1– VO VIN The efficiency depends on the input voltage and the output current. Therefore, obtain the value from the efficiency graph and substitute the percentage in the formula above. VO VIN IO ηx VF 75×75×2mm (7.6°C/W) 100 –1 ηχ : : : : : Output voltage Input voltage Output current Efficiency (%) Diode D1 forward voltage 0.5V(RK46) 125 Operating Ambient Temperature Ta (°C) Thermal design for D1 must be considered separately. ICs 47