TPS40200_081 Datasheet, PDF (1/43 Pages) Texas Instruments – WIDE INPUT RANGE NON-SYNCHRONOUS VOLTAGE MODE CONTROLLER

TPS40200
www.ti.com ........................................................................................................................................ SLUS659D – FEBRUARY 2006 – REVISED NOVEMBER 2008
WIDE INPUT RANGE NON-SYNCHRONOUS VOLTAGE MODE CONTROLLER
FEATURES
1
• Input Voltage Range 4.5 to 52 V
• Output Voltage (700 mV to 90% V_IN)
• 200 mA Internal P-Channel FET Driver
• Voltage Feed-Forward Compensation
• Undervoltage Lockout
• Programmable Fixed Frequency (35–500 kHz)
Operation
• Programmable Short Circuit Protection
• Hiccup Overcurrent Fault Recovery
• Programmable Closed Loop Soft Start
• 700 mV 1% Reference Voltage
• External Synchronization
• Small 8-Pin SOIC (D) and QFN (DRB) Packages
APPLICATIONS
• Industrial Control
• Distributed Power Systems
• DSL/Cable Modems
• Scanners
• Telecom
TYPICAL APPLICATION
V_IN
R5
C3
C4
R3 ^C5
TPS40200
1 RC VDD 8
2 SS ISNS 7
3 COMP GDRV 6
4 FB
R4 _{R1 R2}
GND 5
C6
C1
R_SENSE
Q1 L1
V_OUT
C2
D1
Figure 1. 12 V to 5 V Buck Converter with 94% Efficiency
DESCRIPTION
The TPS40200 is a flexible non-synchronous
controller with a built in 200-mA driver for P-channel
FETs. The circuit operates with inputs up to 52 V with
a power-saving feature that turns off driver current
once the external FET has been fully turned on. This
feature extends the flexibility of the device, allowing it
to operate with an input voltage up to 52 V without
dissipating excessive power. The circuit operates with
voltage-mode feedback and has feed-forward
input-voltage compensation that responds instantly to
input voltage change. The integral 700-mV reference
is trimmed to 2%, providing the means to accurately
control low voltages. The TPS40200 is available in
and 8-pin SOIC and an 8-pin QFN package and
supports many of the features of more complex
controllers. Clock frequency, soft-start, and
overcurrent limit are each easily programmed by a
single, external component. The part has
undervoltage lockout, and can be easily synchronized
to other controllers or a system clock to satisfy
sequencing and/or noise-reduction requirements.
Major sections in this data sheet include:
• Specifications
• General Information
• Example Applications
• Design References
100
90
80
V =8V
IN
V = 12 V
IN
V = 16 V
IN
70
60
V_OUT = 5 V
50
0
0.5
1
1.5
2
2.5
3
Load Current - A
Figure 2. Typical Efficiency of Application Circuit 1
(described in Application 1)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2008, Texas Instruments Incorporated