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Table Of Contents
FEATURES
Applications
DESCRIPTION
Package
Simplified Application Schematic
Connection Diagram
Absolute Maximum Ratings
Operating Ratings
Electrical Characteristics
Typical Performance Characteristics
Typical Application Circuit and Block Diagram
Detailed Operating Description
High Voltage Start-Up Regulator
Shutdown / Standby
Oscillator and Sync Capability
Error Amplifier and PWM Comparator
RAMP Generator
Maximum Duty Cycle / Input Drop-out Voltage
Current Limit
Soft-Start
Boost Pin
Thermal Protection
Application Information
EXTERNAL COMPONENTS
R3 (RT)
L1
C3 (CRAMP)
C9
D1
C1
C8
C7
C4
R5, R6
R1, R2, C2
R4, C5, C6
BIAS POWER DISSIPATION REDUCTION
PCB LAYOUT AND THERMAL CONSIDERATIONS
PCB Layout
Revision History
LM5574, LM5574-Q1
www.ti.com
SNVS478F
–
JANUARY 2007
–
REVISED
APRIL 2013
PCB Layout
Figure 22.
Component
Side
Figure 23.
Solder
Side
Figure 24.
Silkscreen
Copyright ©
2007–2013, Texas Instruments
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