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SM8205 Datasheet(PDF) 1 Page - SamHop Microelectronics Corp. |
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SM8205 Datasheet(HTML) 1 Page - SamHop Microelectronics Corp. |
1 / 13 page High-Power LED Driver with Integrated PWM Dimming MOSFET Driver GENERAL DESCRIPTION SM8205 FEATURES ● Wide input operating voltage range from 8V to 48V ● Internal 2% reference voltage ● Integrated PWM dimming N-channel MOSFET driver ● Dimming ratio: 1000:1 ● 100KHz to 1MHz programmable high-frequency operation ● Programmable slope compensation ● Input under-voltage protection ● LED short-circuit protection (SCP) ● LED open-voltage protection (OVP) ● Junction over-temperature shutdown protection ● Drivers LEDs in Boost, Buck-Boost, SEPIC Topology ● Cycle-by-cycle current limit ● Soft start ● Providing SOP-16 Package ● Single-string LED LCD backlighting ● High power LED drivers ● DC/DC Boost / Buck-Boost converter ● Automotive or Industrial APPLICATIONS TYPICAL APPLICATION CIRCUIT www.samhop.com.tw 1 Rev. 2.0 @ 2011/10 The SM8205 is a current mode control wide-input voltage (8V to 48V) LED driver IC specifically designed to power one or multi-strings of high power LEDs. The 10V gate driver allow the use of standard level MOSFET . The low voltage 5.0V VCC is used to power the internal logic and also acts as a reference voltage to set the current level. An external resistor sets the adjustable switching frequency of the SM8205. The switching frequency can be between 100KHz and 1MHz to optimize efficiency, performance or external component size. This controller uses a peak-current control scheme (with programmable slope compensation), and includes an internal transconductance amplifier to control the output current in closed loop, enabling high output current accuracy. Programmable MOSFET current limit enables current limiting during input under-voltage and output overload conditions. An internal 8V~48V linear regulator powers the IC, elimination the need for a separate power supply for the IC. The SM8205 provides a TTL compatible PWM dimming input that can accept an external control signal with a duty ratio of 0~100% and frequency of up to a few kilohertz. The SM8205 also provides a FAULT output which can be used to disconnect the LEDs in case of a fault condition, using an external disconnect N-channel MOSFET. The SM8205 also offer the following protection functions: LED open protection (OVP), LED short-circuit protection (SCP), Junction over-temperature shutdown and input under voltage lockout (UVLO). L1 D1 Q1 Vin 8V to 48V CIN VCC SS RT CLIM PWMD COMP IREF GND FDBK OVP SC FAULT CS GATE VDD VIN 5 6 7 8 9 10 11 13 12 14 15 16 CDD RSLOPE Rcs Q2 Rsc RL1 Cout Rsn Rcomp Ccomp RT RL2 RR1 RR2 ROVP1 ROVP2 1 2 3 4 CCC |
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