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STA811M Arkusz danych(PDF) 1 Page - Sanken electric |
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STA811M Arkusz danych(HTML) 1 Page - Sanken electric |
1 / 3 page 86 ICs ■Features • Output current: 1.5A • High efficiency: TYP83% (STA811M) • Built-in flywheel diode (schottky-barrier diode) • Requires only 3 discrete components: output coil, input and output capacitors • Phase correction and output voltage adjustment performed internally • Built-in reference oscillator (125kHz) • Built-in foldback-overcurrent and thermal protection circuits • Built-in ON/OFF circuit (soft start available) ■Applications •Power supplies for telecommunication equipment • Onboard local power supplies •OA equipment •For stabilization of the secondary-side output voltage of switching power supplies ■Lineup Part Number Output Voltage (V) STA811M 6.5 ■Absolute Maximum Ratings*1 Unit V A W W °C °C °C/W °C/W Ratings 43 1.5 18.2 (With infinite heatsink) 2.7 (Without heatsink, stand-alone operation) +125 –40 to +125 5.5 37 Symbol VIN IO PD1 PD2 Tj Tstg θ j-c θ j-a Parameter DC Input Voltage Output Current Power Dissipation*2 Junction Temperature Storage Temperature Thermal Resistance (junction to case) Thermal Resistance (junction to ambient air) Output voltage: 2.5V, 3.3V, 5V, 9V, 12V and adjustable types are projected. *1: Absolute maximum ratings show the destructive limit. No parameter should exceed the ratings in transient or normal operations. *2: Limited by thermal protection. ■Recommended Operating Conditions*1 Parameter DC Input Voltage Range Output Current Range*2 Operating Junction Temperature Range Operating Temperature Range*2 Symbol VIN1 VIN2 IO Tjop Top Conditions IO=0 to 1A IO=0 to 1.5A VIN ≥ 9.5V *1: Recommended operating conditions show operating conditions required for normal circuit function described in the electrical characteristics. These conditions must be followed in actual use. *2: Limited by Ta-PD characteristics. Ratings STA811M min. max. 8.5 9.5 9.5 40 0 1.5 –30 +125 –30 +80 Unit V V A °C °C ■Electrical Characteristics Unit V % kHz mV mV mV/ °C A V µA mA µA Parameter Output Voltage Efficiency*1 Oscillation Frequency Line Regulation Load Regulation Overcurrent Protection Starting Current ON/OFF Low Level Voltage Terminal*2 Outflow Current at Low Voltage Quiescent Circuit Current 1 Quiescent Circuit Current 2 Symbol VO Conditions η Conditions fO Conditions VLine Conditions VLoad Conditions ∆VO/∆T IS Conditions VSSL ISSL Conditions Iq Conditions Iq(OFF) Conditions (Ta=25 °C) Ratings STA811M min. typ. max. 6.37 6.5 6.63 VIN=28V, IO=1A 83 VIN=28V, IO=1A 125 VIN=28V, IO=1A 40 100 VIN=10 to 30V, IO=1A 10 40 VIN=28V, IO=0.2 to 1A ±0.5 1.6 VIN=28V 0.5 100 VSSL=0V 7 VIN=28V, IO=0A 200 VIN=28V, VON/OFF=0.3A *1: Efficiency is calculated from the following formula. η (%) = V O ·IO × 100 VIN·IIN *2: Pin 7 is the ON/OFF pin. Soft start at power on can be performed by connecting a capacitor 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. ON/OFF-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. Separate Excitation Switching Mode Regulator ICs with Flywheel Diode STA810M Series Temperature Coefficient of Output Voltage STA811M STA811M ON/OFF 7 ON/OFF 7 ON/OFF C3 C3 7 VO. ON/OFF Soft start Soft start +VO. ON/OFF STA811M 1-1-2 Switching Mode Regulator ICs |
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