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TPS40322 Datasheet(PDF) 12 Page - Texas Instruments

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Part No. TPS40322
Description  Dual Output or Two-Phase Synchronous Buck Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40322 Datasheet(HTML) 12 Page - Texas Instruments

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RA
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RBIAS
COMPx
UDG-11111
VREF
VOUTx
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TPS40322
SLUSAF8
– JUNE 2011
www.ti.com
FUNCTIONAL DESCRIPTION
General Description/Control Architecture
The TPS40322 is a flexible synchronous buck controller. It can be used as a dual-output controller, or as a
multi-phase single-output controller. It operates with a wide input range from 3 V to 20 V and generates accurate
regulated output as low as 600 mV.
In dual output mode, voltage mode control with input feed-forward architecture is implemented. With this
architecture, the benefits are less noise sensitivity, no control instability issues for small DCR applications, and a
smaller minimum controllable on-time, often desired for high conversion ratio applications.
In two-phase single-output mode, a current-sharing loop is implemented to ensure a balance of current between
phases. Because the induced error current signal to the loop is much smaller when compared to the PWM ramp
amplitude, the control loop is modeled as voltage mode with input feed-forward.
DESIGN NOTE
When the device is operating in dual output mode, DIFFO must be floating or tied to BP6.
Voltage Reference
The 600-mV bandgap cell is internally connected to the non-inverting input of the error amplifier. The reference
voltage is trimmed with the error amplifier in a unity gain configuration to remove amplifier offset from the final
regulation voltage. The 0.5-% tolerance on the reference voltage allows the user to design a very accurate power
supply.
Output Voltage Setting
The output voltages of the TPS40322 are set by using external feedback resistor dividers as shown in Figure 15.
The regulated output voltage (VOUT) is determined by Equation 1.
Figure 15. Setting the Output Voltage
(1)
12
Copyright
© 2011, Texas Instruments Incorporated


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