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LM34919 Fiches technique(PDF) 7 Page - Texas Instruments |
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LM34919 Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 21 page UVLO VIN VCC SW Pin Inductor Current SS Pin t2 VOUT 7.0V 2.5V t1 LM34919 www.ti.com SNOSAY2D – MAY 2007 – REVISED JUNE 2008 Figure 3. Start Up Sequence FUNCTIONAL DESCRIPTION The LM34919 Step Down Switching Regulator features all the functions needed to implement a low cost, efficient buck bias power converter capable of supplying at least 0.6A to the load. This high voltage regulator contains an N-Channel buck switch, is easy to implement, and is available in micro SMD package. The regulator's operation is based on a constant on-time control scheme, where the on-time is determined by VIN. This feature allows the operating frequency to remain relatively constant with load and input voltage variations. The feedback control requires no loop compensation resulting in very fast load transient response. The valley current limit detection circuit, internally set at 0.64A, holds the buck switch off until the high current level subsides. This scheme protects against excessively high current if the output is short-circuited when VIN is high. The LM34919 can be applied in numerous applications to efficiently regulate down higher voltages. Additional features include: Thermal shutdown, VCC under-voltage lockout, gate drive under-voltage lockout, and maximum duty cycle limiter. Copyright © 2007–2008, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM34919 |
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