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| 型号： | KIT34717EPEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 12/28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
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
Today’s advanced systems are increasingly requiring
more efficient and accurate power supplies. They present a
set of challenges that include highly accurate voltage
regulation, high current and fast transient response
capability, voltage monitoring (power sequencing), and
increased operating frequency. Point of Load power supplies
offer adequate solutions to these challenges. They are non-
isolated DC to DC converters that are located near their load
and take their input voltage from an intermediate not,
necessarily, regulated bus. their close proximity to the load is
of a high importance with newer device requirements. While
meeting the challenges, they allow for higher efficiency,
localized protection, and minimum distribution losses. Their
compact design and value makes them cost effective.
The 34717 is a PoL dual output power supply. Its
integrated solution offers a cost effective system and reliable
operation. It utilizes a voltage mode synchronous buck
switching converter topology with integrated low R DS(ON)
(50 m Ω ) N-channel power MOSFETs for higher efficiency
continuous current from both channels. The second output
tracking abilities makes it ideal for systems with multiple
related supply rails. It has a programmable switching
frequency that allows for flexibility and optimization over the
operating conditions and can operate at up to 1.0 MHz to
significantly reduce the external components size and cost. It
also provides the ability to program the over current limit for
both channels. It protects against output over-current, over-
voltage, under-voltage, and over-temperature conditions. It
also protects the system from short circuit events. It
incorporates a power good output signal to alert the host
when a fault occurs.
It can be enabled and disabled by controlling the SD pin,
which offers power sequencing capabilities.
By integrating the control/supervisory circuitry along with
the Power MOSFET switches for the buck converter into a
space-efficient package, the 34717 offers a complete, small-
size, cost-effective, and simple solution to satisfy the needs
of today’s systems.
operation. It provides an output voltage with an accuracy of
less than ± 2.0%, and capable of supplying up to 5.0 A of
FUNCTIONAL PIN DESCRIPTION
BOOTSTRAP INPUT (BOOT1, BOOT2)
Bootstrap capacitor input pin. Connect a capacitor (as
discussed in Bootstrap capacitor on page 21 ) between this
pin and the SW pin of the respective channel to enhance the
gate of the high side Power MOSFET during switching.
POWER INPUT VOLTAGE (PVIN1, PVIN2)
Buck converter power input voltage. This is the drain of the
divider and connect the V TT voltage (channel 2) directly to
INV2 pin.
INTERNAL SUPPLY VOLTAGE OUTPUT (VDDI)
This is the output of the internal bias voltage regulator.
Connect a 1.0 μF, 6.0 V low ESR ceramic filter capacitor
between this pin and the GND pin. Filtering any spikes on this
output is essential to the internal circuitry stable operation.
buck converter high side power MOSFET.
SIGNAL GROUND (GND)
SWITCHING NODE (SW1, SW2)
Buck converter switching node. This pin is connected to
Analog ground of the IC. Internal analog signals are
referenced to this pin voltage.
the output inductor.
INPUT SUPPLY VOLTAGE (VIN)
POWER GROUND (PGND1, PGND2)
Buck converter and discharge MOSFETs power ground. It
IC power supply input voltage. Input filtering is required for
the device to operate properly.
is the source of the buck converter low side power MOSFET.
POWER GOOD OUTPUT SIGNAL (PG)
COMPENSATION INPUT (COMP1, COMP2)
Buck converter external compensation network connects
to this pin. Use a type III compensation network.
ERROR AMPLIFIER INVERTING INPUT (INV1, INV2)
Buck converter error amplifier inverting input. Connect the
V DDQ voltage (channel 1) to INV1 pin through a resistor
This is an active low open drain output that is used to
report the status of the device to a host. This output activates
after a successful power up sequence and stays active as
long as the device is in normal operation and is not
experiencing any faults. This output activates after a 10 ms
delay and must be pulled up by an external resistor to a
supply voltage like V IN .
34717
Analog Integrated Circuit Device Data
12
Freescale Semiconductor
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