STA820M SANKEN | Alldatasheet

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88 ICs

■Lineup Part Number Output Voltage (V) STA821M 5 ■Absolute Maximum Ratings*1 Unit V A W W °C/W °C/W Ratings 18.2 (With infinite heatsink) 2.7 (Without heatsink, stand-alone operation) +125 –40 to +125 5.5 Symbol VIN IO PD1 PD2 Tj Tstg θj-c θj-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: 3.3V, 9V , 12V; adjustable types currently being planned *1: The 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 Ambient Temperature Range*2 Symbol VIN IO Tjop Top Unit V A *1: The recommended operating conditions show the operating conditions required for the normal circuit function described in the electrical characteristics. These conditions must be followed in actual use. *2: Limited by Ta-PD characteristics. Ratings STA821M min. max. 73 0 –30 +125 –30 +80 ■Electrical Characteristics Unit V kHz mV mV mV/°C A V µA mA Parameter Output Voltage Efficiency*1 Oscillation Frequency Line Regulation Load Regulation Temperature Coefficient of Output Voltage Overcurrent Protection Starting Current ON/OFF Low Level Voltage Terminal*2 Outflow Current at Low Voltage Quiescent Circuit Current Symbol VO Conditions η Conditions fO Conditions VLine Conditions VLoad Conditions ∆VO/∆T IS Conditions VSSL ISSL Conditions Iq Conditions (Ta=25°C) Ratings STA821M min. typ. max. 4.8 5.0 5.2 VIN=20V, IO=1A VIN=20V, IO=1A 110 VIN=20V, IO=1A 40 100 VIN=10 to 30V, IO=1A 10 40 VIN=20V, IO=0.5 to 1.5A ±0.5 3.1 VIN=20V 0.2 15 25 35 VSSL=0.2V VIN=20V, IO=0A *1: Efficiency is calculated from the following formula. η(%) = VO·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 C 3 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. ■Features

  • Output current: 3A
  • High efficiency: TYP 83% (STA821M)
  • 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 (110kHz)
  • Built-in foldback-overcurrent and thermal protection circuits
  • Built-in ON/OFF circuit (soft start available) ■Applications
  • P ower supplies for telecommunication equipment
  • On-board local power supplies
  • O A equipment
  • F or stabilization of the secondary-side output voltage of switching power supplies STA821M STA821M ON/OFF7 ON/OFF7 ON/OFF C3C3 VO. ON/OFF Soft start Soft start +VO. ON/OFF STA821M Separate Excitation Switching Mode Regulator ICs with Flywheel DiodeSTA820M Series 1-1-2 Switching Mode Regulator ICs

■External Dimensions (SIP8 [STA 8Pin]) (Unit : mm) ■Block Diagram ■Typical Connection Diagram b a 1.15 20.15±0.3 +0.2 –0.1 0.55+0.2 –0.1 (Measured at the root) Plan View 0.7 0.7 STA821M 9±0.2 2.3±0.2 1.7MAX (1) 3.15±0.5(3.1) 4±0.2 1.2±0.1 2–(R1) 4.3±0.7 (Measured at the tip) (Measured at the root) R-END 2–(R0.65) 18 2 357 46 C1.5±0.5 SK GNDDi 5,8 GND VIN ON/OFF SW OUT VOUTL C2C1 VOS

3 VIN

Reset Latch & Driver Thermal Protection Reference Voltage 3.VIN 5,8.GND 2.GND 7.ON/OFF GND STA821M 1.SW 6.VOS VOUTVIN GND Pin Assignment q SWOUT w GND e VIN r N.C t GND y VOS u ON/OFF i GND Plastic Mold Package Type Flammability: UL 94V-0 Product Mass: Approx. 2.0 g C1: 1000µF/50V C2: 1000µF/25V C3: 0.47µF/10V(only when the soft start function is used) L1: 100µH ■Ta-PD Characteristics VO: Output voltage VIN : Input voltage IO: Output current ηχ : Efficiency (%) PD = VO·IO 100 ηχ –25 0 25 50 Ambient Temperature Ta (°C) Power Dissipation PD (W) 75 125100 25×50×2mm (25°C/W) Without Heatsink (37°C/W) With Infinite Heatsink Without Insulating Sheet With Silicone Grease Heatsink: Aluminum