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APW7071 Fiches technique(PDF) 8 Page - Anpec Electronics Coropration

No de pièce APW7071
Description  White LED DC/DC Step-Up Converter
Download  15 Pages
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Fabricant  ANPEC [Anpec Electronics Coropration]
Site Internet  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APW7071 Fiches technique(HTML) 8 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.1 - Feb., 2006
APW7071
www.anpec.com.tw
8
Function Descriptions
OPERATION
The APW7071 operates in a pulse frequency modu-
lation (PFM) scheme with constant peak current
control.The operation can be understood by referring
to the block diagram of Figure 1. The converter moni-
tors the output voltage, and if the feedback voltage
falls below the reference voltage (typical 0.25V), the
internal switch turns on and the inductor current ramps
up. The switch turns off if the inductor current reaches
the internally set peak current (typical 400mA) or
maximum on-time detected. As the switch is turned
off, the inductor current ramps down to zero and
charge output capacitor through external Schottky
diode. The switch remains off for a minimum of 400
ns (typical), or until the feedback voltage drops be-
low the reference voltage again. The operation fre-
quency is up to 1MHz and is determined by the out-
put current, current limit, inductor value, input volt-
age and output voltage.
This regulation scheme is
inherently stable, allowing a wider selection range
for the inductor and output capacitor.
Enable
Force SHDN pin greater than 1.3 V to enable the
device works in normal operation. Pulling SHDN pin
less than 0.4V to shut down reducing the shutdown
current to 0.1
µA (typical). The SHDN pin should
not be left floating.
Soft Start
The APW7071 limits this inrush current by increas-
ing the current limit at start-up.
Under Voltage Lockout
Transients during powering on or instantaneous
glitches in the supply voltage can cause system
damage or failure. The undervoltage lockout circuit
turned the main switch off to prevent malfunction at
low input voltage.
Over Voltage Protection (OVP)
OVP is integrated to prevent the output voltage
increase over the maximum switching voltage rating.
In some cases an LED may fail, this will result in
the feedback voltage always being zero. The device
will boost the output voltage higher and higher.
When the output voltage exceeds the OVP thresh-
old voltage (typical 17V), the switch turns off. The
converter switch remains off until the output voltage
falls below the OVP threshold voltage.
Thermal Shutdown
A thermal shutdown function is integrated to shut-
down device when junction temperature exceed
160
°C. If thermal shutdown detected, converter
switch turn off until junction temperature falls bellow
120
°C.


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