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| 型号： | KIT34717EPEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL BOARD 5A 1.0MHZ |
| 标准包装： | 1 |
| 系列： | * |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
TRACKING AND SEQUENCING
This block allows the second output of the 34717 to track
the voltage applied at the VREFIN pin in different tracking
configurations. This will be discussed in further details later in
this document. For power down during a shutdown mode, the
34717 uses internal discharge MOSFETs (M8 and M9 on
Figure 2 , page 2 ) to discharge the first and second output
respectively. The discharge MOSFETs are only active during
shutdown mode. Using this block along with controlling the
SD pin can offer the user power sequencing capabilities by
controlling when to turn the 34717 outputs on or off.
BUCK CONVERTER
This block provides the main function of the 34717: DC to
DC conversion from an un-regulated input voltage to a
regulated output voltage used by the loads for reliable
frequency (externally adjustable), synchronous buck PWM
voltage-mode control. It drives integrated 50m Ω N-channel
power MOSFETs saving board space and enhancing
efficiency. The switching regulator output voltage is
adjustable with an accuracy of less than ±2% to meet today’s
requirements. The second channel’s output has the ability to
track the voltage applied at the VREFIN pin. The regulator's
voltage control loop is compensated using a type III
compensation network, with external components to allow for
optimizing the loop compensation, for a wide range of
operating conditions. A typical Bootstrap circuit with an
internal PMOS switch is used to provide the voltage
necessary to properly enhance the high side MOSFET gate.
The 34717 has the ability to supply up to 5.0 A of
continuous current from each channel, making it suitable for
many high current applications.
operation. The buck converter is a high performance, fixed
34717
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
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