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HT7L4091 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT7L4091 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
5 / 26 page Rev. 1.00 4 ���i� ��� �011 Rev. 1.00 5 ���i� ��� �011 HT7L4091 Universal Step-Down PWM Control For High Brightness LED Lighting Control Pin Assignment VIN CS GND GDR RT LD VDD PDM HT7L4091 8 SOP-A 1 2 3 4 8 7 6 5 Pin Description Pin Name I/O Description VIN I In�ut vo�tage �in CS I LED st�ing cu��ent sense in�ut GND — Powe� g�ound GDR O Gate d�ive� fo� the exte�na� MOSFET PDM I PWM dimming �in ��so functions as enab�e in�ut �in. VDD O Positive Powe� su���y Used for the internal circuits except the gate driver circuit. A 0.1μF capacitor must be connected between the VDD and the GND pins. LD I Linea� dimming �in Set the current sense threshold as long as the voltage on this pin is less than 250mV (ty�.). RT I Osci��ato� cont�o� �in � �esisto� is connected between the RT and the GND �ins to set the off-time. Absolute Maximum Ratings Output Current Peak ...................................................................................................................... 1A Storage Temperature Range ......................................................................................-65°C ~ +150°C Junction Temperature Range.....................................................................................-40°C ~ +150°C CS, PDM, LD ,RT, to GND .................................................................................-0.3V to (VDD +0.3V) Power Dissipation at Ta<25 °C .................................................................................................. 0.6W Thermal Resistance, SOP-8 θJA.........................................................................................150°C/W ESD Voltage Protection, Human Body Model............................................................................ 6KV ESD Voltage Protection, Machine Model .................................................................................. 400V Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratings” may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. |
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