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LM3492Q Scheda tecnica(PDF) 3 Page - Texas Instruments |
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LM3492Q Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 24 page LM3492, LM3492Q www.ti.com SNVS656C – SEPTEMBER 2010 – REVISED MAY 2013 PIN DESCRIPTIONS (continued) Pin Name Description Application Information 14 LGND Ground of the Current Regulator Current regulator ground. Must be connected to the GND pin for normal operation. The LGND and GND pins are not internally connected. 15 DIM1/CLK Dimming Control of Channel 1 Control the on/off of the current regulator of channel 1. This pin is internally pulled low by a 5 µA current. This pin also serves as a clock signal for latching input/output data of the COMM pin. 16 DIM2 Dimming Control of Channel 2 Control the on/off of the current regulator of channel 2. This pin is internally pulled low by a 5 µA current. 17, 18 PGND Power Ground Integrated MOSFET ground. Must be connected to the GND pin for normal operation. The PGND and GND pins are not internally connected. 19 VCC LDO Regulator Output Nominally regulated to 5.5V. Connect a capacitor of larger than 0.47 µF between the VCC and GND pins. 20 ILIM Peak Current Limit Adjust Connect an external resistor from the ILIM pin to the VCC pin reduces peak current limit. Connect the ILIM pin to the ground to obtain the maximum current limit. DAP DAP Exposed Pad Thermal connection pad. Connect to a ground plane. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS (1) VALUE / UNITS VIN, RT, VOUT to GND −0.3V to 67V SW to GND −0.3V to 67V SW to GND (Transient) −2V (<100 ns) ILIM to GND −0.3V to 0.3V FB to GND −0.3V to 5V COMM, DIM1, DIM2, to GND −0.3V to 6V ESD Rating, Human Body Model (2) ±2kV Storage Temperature Range −65°C to +150°C Junction Temperature (TJ) 150°C (1) Absolute Maximum Ratings are limits which damage to the device may occur. Operating ratings are conditions under which operation of the device is intended to be functional. For specifications and test conditions, see the electrical characteristics. Thermal shutdown might occur within ambient operating temperature range as junction temperature rises above TSD level, customer should refer to efficiency data and thermal resistance data to estimate the junction temperature to ambient temperature delta. (2) The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin. RECOMMENDED OPERATING CONDITIONS (1) Supply Voltage (VIN) 4.5V to 65V Operation Temperature Range (TA) −40°C to +125°C Thermal Resistance ( θJA) (2) 32.7°C/W (1) Absolute Maximum Ratings are limits which damage to the device may occur. Operating ratings are conditions under which operation of the device is intended to be functional. For specifications and test conditions, see the electrical characteristics. Thermal shutdown might occur within ambient operating temperature range as junction temperature rises above TSD level, customer should refer to efficiency data and thermal resistance data to estimate the junction temperature to ambient temperature delta. (2) The θJA is measured on a 4-layer standard JEDEC thermal test board with 12 vias, no air flow and 1W power dissipation. Thermal shutdown will occur if the junction temperature exceeds 165°C. The maximum power dissipation is a function of TJ(MAX), θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) – TA) /θJA. Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM3492 LM3492Q |
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