文档介绍：TPS54283, TPS54286
SLUS749C–JULY 2007–REVISED OCTOBER 2007
2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
1FEATURES CONTENTS
23• -V to 28-V Input Range Device Ratings 2
• Output Voltage Range V to 90% of Input Electrical Characteristics 3
Voltage Device Information 9
• Output Current Up to 2 A Application Information 12
• Two Fixed Switching Frequency Versions: Design Examples 32
– TPS54283: 300 kHz Additional References 44
– TPS54286: 600 kHz
• Two Selectable Levels of Overcurrent DESCRIPTION
Protection (Output 2) TPS54283 and TPS54286 are dual output
• -V % Voltage Reference non-synchronous buck converters capable of
supporting 2-A output applications that operate from a
• -ms Internal Soft Start
-V to 28-V input supply voltage, and require output
• Dual PWM Outputs 180° Out-of-Phase voltages between V and 90% of the input voltage.
•
Ratiometric or Sequential Startup Modes With internally-determined operating frequency, soft
Selectable by a Single Pin start time, and control pensation, these
• 100-mΩ Internal High-Side MOSFETs converters provide many features with a minimum of
• Current Mode Control ponents. Channel 1 overcurrent
• protection is set at 3 A, while Channel 2 overcurrent
pensation (See Page 16) protection level is selected by connecting a pin to
• Pulse-by-Pulse Overcurrent Protection ground, to BP, or left floating. The setting levels are
• Thermal Shutdown Protection at 148°C used to allow for scaling of ponents for
applications not needing the full load capability of
• 14-Pin PowerPAD™ HTSSOP package
both outputs.
APPLICATIONS The outputs may be enabled independently, or may
• Set Top Box be configured to allow either ratiometric or sequential
• startup sequencing. Additionally, the two outputs may
Digital TV also be powered from different sources.
• Power for DSP
• Consumer Electronics
VIN
TPS54283
1 PVDD1 PVDD2 14
2 BOOT1 BOOT2 13
OUTPUT1 OU