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SS9176 データシート(PDF) 7 Page - Silicon Standard Corp.

部品番号 SS9176
部品情報  Dual Synchronous DC/DC Controllers With Current Sharing Circuitry
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メーカー  SSC [Silicon Standard Corp.]
ホームページ  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

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SS9175/6
OPERATION
The SS9175/6 series controllers integrate two sets
of synchronous MOSFET driver circuits with current
sharing capability. The following descriptions highlight
the advantages of the SS917x designs.
Soft-start
A 25uA start-up current is provided by the SS/EN pin
for the start-up sequence. During this start-up
sequence, the SS917x is disabled when the SS/EN
pin is less than 1.0V. From 1.0V to 3.0V, PWM output
duty cycle is gradually and smoothly increased to its
desired value. During this time, the current sharing
circuit is disabled for smooth soft start. After 3.0V, the
current sharing circuit is enabled and the whole circuit
operates normally.
Oscillator operation
The SS9175/6 series have three versions with
different
oscillation
frequencies.
The
oscillation
frequency is fixed at 300 kHz, 600 kHz or 1 MHz. The
voltage amplitude of the internal saw tooth oscillator is
from 1.2V to 2.8V.
Error amplifier
The error amplifier’s inverting input is connected to the
IN pin, and the output is connected to the COMP pin.
The
COMP
output
is
available
for
external
compensation, allowing designers to control the
feedback-loop
frequency-response.
Non-inverting
input is not wired out to a pin, but it is internally biased
to a fixed 0.7V ± 1% voltage.
Over-current protection
The over-current protection (OCP) is implemented by
adding a resistor from the MOSFET supply voltage to
the CL+ pin, which sinks a 100uA current source. An
internal comparator senses the voltage difference
between CL+ and CL- pin. If the CL- pin voltage is
lower than the CL+ pin voltage, meaning there is a
larger current flowing through the high-side MOSFET,
the comparator will trigger the OCP protection. The
OCP function also has a 50% fold-back circuit to limit
the MOSFET current within the desired over-current
value.
Output driver
The high-side driver uses an external bootstrap circuit
to provide the required boost supply voltage. The
external bootstrap circuit uses the BSTC output
voltage for providing the diode voltage. For the
low-side driver, the supply voltage is coming from the
BSTC output voltage, which is roughly 6V if VCC is
larger than 6.5V.The output stage is designed to
ensure zero cross-conduction current.
Current Sharing
The
dual-phase
controller
has
current-sharing
capability to match both channels to within 5%.
APPLICATION INFORMATION
Rev.2.02 12/29/2003
PRELIMINARY


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