BCM48BH120M120A00【PDF 14/16 页】HALF-CHIP BCM BUS CONVERTER

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PRELIMINARY BCM48BH120T120A00 - BCM48BH120M120A00

8.0 INPUT AND OUTPUT FILTER DESIGN

A major advantage of SAC systems versus conventional PWM

converters is that the transformers do not require large

functional filters. The resonant LC tank, operated at extreme

high frequency, is amplitude modulated as a function of input

voltage and output current, and efficiently transfers charge

through the isolation transformer. A small amount of

capacitance, embedded in the input and output stages of the

module, is sufficient for full functionality and is key to achieve

power density.

This paradigm shift requires system design to carefully evaluate

external filters in order to:

Total load capacitance at the output of the BCM shall not

exceed the specified maximum. Owing to the wide bandwidth

and low output impedance of the BCM, low frequency bypass

capacitance and significant energy storage may be more

densely and efficiently provided by adding capacitance at the

input of the BCM. At frequencies <500 kHz the BCM appears

as an impedance of R OUT between the source and load.

Within this frequency range capacitance at the input appears

as effective capacitance on the output per the relationship

defined in Eq. 6.

1. Guarantee low source impedance:

C OUT =

C IN

K 2

Eq. 6

To take full advantage of the BCM dynamic response, the

impedance presented to its input terminals must be low

from DC to approximately 5 MHz. The connection of the

V ? I Chip to its power source should be implemented with

This enables a reduction in the size and number of capacitors

used in a typical system.

minimal distribution inductance. If the interconnect

inductance exceeds 100 nH, the input should be bypassed

with a RC damper to retain low source impedance and

stable operation. With an interconnect inductance of

200 nH, the RC damper may be as high as 47 μF in series

with 0.3 Ω . A single electrolytic or equivalent low-Q

capacitor may be used in place of the series RC bypass.

2. Further reduce input and/or output voltage ripple without

sacrificing dynamic response:

Given the wide bandwidth of the BCM, the source

response is generally the limiting factor in the overall

system response. Anomalies in the response of the source

will appear at the output of the BCM multiplied by its

K factor. This is illustrated in Figures 11 and 12.

3. Protect the module from overvoltage transients imposed

by the system that would exceed maximum ratings and

cause failures:

The V ? I Chip input/output voltage ranges shall not be

exceeded. An internal overvoltage lockout function

prevents operation outside of the normal operating input

range. Even during this condition, the powertrain is exposed

to the applied voltage and power MOSFETs must withstand

it. A criterion for protection is the maximum amount of

energy that the input or output switches can tolerate if

avalanched.

Rev. 2.0

V?I CHIP INC. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200

12/10

Page 14 of 16

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