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TPS40074 Datasheet

  • TPS40074

  • 具有電壓前饋的中等范圍輸入同步降壓控制器

  • 38頁(yè)

  • TI

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TPS40074
SLUS617 鈥?APRIL 2005
www.ti.com
APPLICATION INFORMATION (continued)
GROUNDING AND BOARD LAYOUT
The TPS40074 provides separate signal ground (GND) and power ground (PGND) pins. Care should be given to
proper separation of the circuit grounds. Each ground should consist of a plane to minimize its impedance if
possible. The high power
noisy
circuits such as the output, synchronous rectifier, MOSFET driver decoupling
capacitor (DBP), and the input capacitor should be connected to PGND plane.
Sensitive nodes such as the FB resistor divider and RT should be connected to the GND plane. The GND plane
should only make a single point connection to the PGND plane. It is suggested that the GND pin be tied to the
copper area for the PowerPAD underneath the chip. Tie the PGND to the PowerPAD copper area as well and
make the connection to the power circuit ground from the PGND pin. Reference the output voltage divider to the
GND pin.
Component placement should ensure that bypass capacitors (LVPB and DBP) are located as close as possible
to their respective power and ground pins. Also, sensitive circuits such as FB, RT and ILIM should not be located
near high dv/dt nodes such as HDRV, LDRV, BOOST, and the switch node (SW). Failure to follow careful layout
practices results in sub-optimal operation.
SYNCHRONOUS RECTIFIER CONTROL
Table 2
describes the state of the rectifier MOSFET control under various operating conditions.
Table 2. Synchronous Rectifier MOSFET States
SYNCHRONOUS RECTIFIER OPERATION DURING
SOFT-START
Off until first high-side pulse is
detected, then on when high-side
MOSFET is off
NORMAL
Turns off at the start of a new
cycle. Turns on when the
high-side MOSFET is turned off
FAULT
(FAULT RECOVERY IS SAME
AS SOFT-START)
OFF
OVERVOLTAGE
Turns OFF only at start of next
cycle ON if duty cycle is > 0
20

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