STA810M SANKEN | Alldatasheet

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Technical content

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
  • P ower supplies for telecommunication equipment
  • Onboard local power supplies
  • O A equipment
  • F or 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/W °C/W Ratings 1.5 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 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 ■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 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 VIN=28V, IO=0A 200 VIN=28V, VON/OFF=0.3A *1: Efficiency is calculated from the following formula. η (%) = VO·IO × 100VIN·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 DiodeSTA810M Series Temperature Coefficient of Output Voltage STA811M STA811M ON/OFF7 ON/OFF7 ON/OFF C3C3 VO. ON/OFF Soft start Soft start +VO. ON/OFF STA811M 1-1-2 Switching Mode Regulator ICs

■External Dimensions (SIP8 [STA 8Pin]) 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 (Unit : mm) ■Block Diagram b a 1.15 20.15±0.3 +0.2 –0.1 0.55+0.2 –0.1 7×P2.54±0.1=17.78 (Measured at the root) Plan View 0.7 0.7 STA811M 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 of pin) R-END 2–(R0.65) 18 2 357 46 C1.5±0.5 SK GND 5,8 GND VIN ON/OFF SW OUT VOUTL C2C1 VOS

3 VIN

PReg. Overcurrent Protection STA811M Reset Oscillator Comparator Error Amp Latch & Driver Thermal Protection ON/OFF Soft Start Reference Voltage Di ■Typical Connection Diagram C1: 220 µF/50V C2: 470 µF/25V C3: 0.47 µF/10V (Only when using soft start function) L1: 100 µH 3.VIN 5,8.GND 2.GND 7.ON/OFF GND STA811M 1.SW 6.VOS VOUTVIN GND ■Thermal Derating –25 0 25 50 Ambient Temperature Ta (°C) Power Dissipation PD (W) 75 125100 Without Insulating Sheet With Silicone Grease Heatsink: Alminum With Infinite Heatsink 25×50×2mm (25°C/W) Without Heatsink (37°C/W) VO : Output voltage VIN : Input voltage IO : Otuput current ηχ : Efficiency (%) PD = VO·IO 100 –1ηχ

Efficiency Output Voltage Rise Output Voltage Fluctuation Overcurrent Protection Characterisitcs Thermal Protection Temperature Characteristics 100 Output Current IO (A) Efficiency η (%) VIN=8.5V 20V 28V 40V 05 1 5 10 25 20 30 Intput Voltage VIN (V) Output Voltage VO (V) lO =0A 1.5A 6.40 6.50 6.30 6.60 6.70 Output Current IO (A) Output Voltage VO (V) VIN=40V 28V 20V 8.5V 0 0.5 1.5 1 2.523 Output Current IO (A) Output Voltage VO (V) VIN=8.5V 28V 40V 50 75 125100 175150 200 Ambient Temperature Ta (°C) Output Voltage VO (V) TSD ONTSD OFF –50 0 50 100 150 160 140 120 100 6.65 6.6 6.55 6.5 6.45 6.4 Ambient Temperature Ta (°C) Efficiency η (%) Frequency Freq (kHz) Output Current VO (A) Freq VO η