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SS6639-33CZBG 데이터시트(PDF) 8 Page - Silicon Standard Corp.

부품명 SS6639-33CZBG
상세설명  1-Cell, 3-Pin, Step-Up DC/DC Controller
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제조업체  SSC [Silicon Standard Corp.]
홈페이지  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

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SS6639
n PIN DESCRIPTIONS
Pin 1:
GND:
Ground. Must be low impedance;
solder directly to ground plane.
Pin 2:
VOUT:
IC supply pin. Connect Vout to the
regular output.
Pin 3:
EXT:
Push-pull driver output for external
power. Switch.
n APPLICATION INFORMATION
General Description
The SS6639 PFM (pulse frequency modulation)
controller IC combines a switch mode regulator, a
push-pull driver, a precision voltage reference, and a
voltage detector in a single monolithic device. It
offers
extremely
low
quiescent
current,
high
efficiency, and very low gate-threshold voltage to
ensure start-up with low battery voltage (0.8V typ.).
Designed to maximize battery life in portable
products, it minimizes switching losses by only
switching as needed to service the load.
PFM controllers transfer a discrete amount of energy
per cycle and regulate the output voltage by
modulating the switching frequency with a constant
turn-on time. Switching frequency depends on load,
input voltage, and inductor value and can range up
to 100 KHz.
When the output voltage drops, the error comparator
enables the 100 kHz oscillator which turns the
MOSFET on for around 7.5us and off for 2.5
µs.
Turning on the MOSFET allows inductor current to
ramp up, storing energy in the magnetic field.
When the MOSFET turns off, the inductor forces
current through the diode to the output capacitor and
the load. As the stored energy is depleted, the
current ramps down until the diode turns off. At this
point, the inductor may ring due to residual energy
and stray capacitance. The output capacitor stores
charge when current flowing through the diode is
high, and releases it when current is low, thereby
maintaining a steady voltage across the load.
As
the
load
increases,
the
output
capacitor
discharges faster and the error comparator initiates
cycles sooner, increasing the switching frequency.
The maximum duty cycle ensures adequate time for
energy transfer to the output during the second half
of each cycle. Depending on the circuit, PFM
controllers can operate in either discontinuous mode
or continuous conduction mode. The continuous
conduction mode means that the inductor current
does not ramp to zero during each cycle.
+
V
IN
SW
V
OUT
EXT
I
D
I
OUT
Isw
Ico
I
IN
Discontinuous Conduction Mode
Rev.2.01 6/26/2003


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