SM8120 Nippon_Precision_Circuits America, SM8120 Datasheet
SM8120
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SM8120 Summary of contents
Page 1
... OVERVIEW The SM8120AH is a high efficiency step-up DC-DC converter. Due to high voltage CMOS process realizing 24V output supply as maximum value, white LED of 2–4 lights connected in series can be lighted. By connect- ing in series, current variation among LED is eliminated. Current value sent to white LED can be set by exter- nal resistors ...
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... BLOCK DIAGRAM SW VDD CE VSS PIN DESCRIPTION Number Name 1 VDD 2 VSS Input with built-in pull-down resistor SM8120AH Q S Buff COMP R OSC I/O Description – Power supply – GND O Coil switching I Feed back (Output current detection Chip enable (High active) ...
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... VDD Standby current VDD Quiescent current VDD SW-Tr ON resister SW SW-Tr leak current SW Maximum oscillator frequency SW Duty SW Input voltage CE CE Input current FB Soft-start time SW FB voltage FB SM8120AH Symbol Rating − 0 – –0 250 SW 250 ( ° – ...
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... TYPICAL APPLICATIONS The SM8120AH can be light white LEDs series by boosting up the input voltage using a switching regulator method. By comparing the voltage of FB pin with the internal reference voltage and using the PFM control, the IC supplies constant current to the LED. Brightness can also be adjusted by PWM control to CE (chip enable) pin. The typical frequency range of the PWM signal is 100Hz to 400Hz, and duty cycle is 10% to 90%. 22µ ...
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... Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. SM8120AH NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome, Koto-ku, ...