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THV6530 Datasheet(PDF) 7 Page - THine Electronics, Inc.

Part No. THV6530
Description  THV6530 is a controller IC power supply system with
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Maker  THINE [THine Electronics, Inc.]
Homepage  http://www.thine.co.jp/index_e.html
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THV6530 Datasheet(HTML) 7 Page - THine Electronics, Inc.

 
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Copyright© 2013 THine Electronics, Inc. All rights reserved.
THL6530_Rev.1.00_E
determined by the output capacitor total capacitance,
COUT, and the output
2
rip
IN
peak
peak
OUT
OSC
OUT
rip
I
I
I
ESR
I
C
F
I
D
VLS
The first ripple component can be reduced by increasing
COUT since FOSC is fixed 1.2MHz(typ). Changing COUT
may require adjustment of compensation R and C in
order to provide adequate phase margin and loop
bandwidth.
The second ripple component can be reduced by
selecting low-ESR ceramic capacitors and using several
smaller capacitors in parallel instead of just one large
capacitor.
[Inductor selection]
To prevent magnetic saturation of the inductor core the
inductor has to be rated for a maximum current larger
than IPK in a given application. Since the chip provides
current limit protection of 1.8A, it is generally
recommended that the inductor be rated at least for 1.8A.
Selection of the inductor requires trade-off between the
physical size (footprint x height) and its electrical
properties (current rating, inductance, resistance). Within
a given footprint and height, an inductor with larger
inductance typically comes with lower current rating and
often larger series resistance. Larger inductance typically
requires more turns on the winding, a smaller core gap or
a core material with a larger relative permeability. An
inductor with a larger physical size has better electrical
properties than a smaller inductor.
It is desirable to reduce the ripple current ΔIrip in order to
reduce voltage noise on the input and output capacitors.
In practice, the inductor is often much larger than the
capacitors and it is easier and cheaper to increase the size
of the capacitors. The ripple current ΔIrip is then chosen
the largest possible while at the same time not degrading
the maximum input and output current that the converter
can operate with before reaching the current limit of the
chip or the rated current of the inductor.
MAX
rip
IN
peak
I
I
I
I
2
For example, ΔIrip could be set to 20% of IMAX
Voltage detector circuit
The internal voltage detector circuit monitors the chip ut
voltage VIN. The chip can either drive RST pin low or
leave it floating. While floating, RST is pulled high by
an external pull up resistor. When VIN drops below 2.6V
the chip pulls RST pin low. In order to release RST the
VIN voltage must rise above 2.7V. The voltage detector
circuit is disabled and RST is floating while the chip is
disabled and for 120ms from the time the chip is enabled
(VIN>UVLO and EN is high).
Positive charge pump (VGH)
The positive charge pump is used to generate the TFT
LCD gate on voltage. The output voltage, VGH, can be
set by an external resistive divider.
Voltage VVGH_FB is typically 1.2V. A single stage charge
pump can produce an output voltage less than
approximately twice the charge pump input voltage VLS.
The output voltage VGH is regulated as the following
equation.
5
6
5
_
R
R
R
V
VGH
FB
VGH


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