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HM1483B データシート(PDF) 6 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

部品番号 HM1483B
部品情報  Wide Range Synchronous Buck Controller
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メーカー  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
ホームページ  http://www.hmsemi.com/
Logo HMSEMI - Shenzhen Huazhimei Semiconductor Co., Ltd

HM1483B データシート(HTML) 6 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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Application Information
The
operates by a constant frequency,
current mode architecture. The output voltage is
set by an external divider returned to the FB pin.
An error amplifier compares the divided output
voltage with a reference voltage of 1.21V and ad-
justs the peak inductor current accordingly.
During normal operation, the internal P-channel
MOSFET is turned on each cycle when the oscilla-
tor sets the RS latch, and turned off when the cur-
rent comparator, resets the RS latch. While the P-
channel MOSFET is off, the N-channel MOSFET is
turned on until either the inductor current starts to
reverse, as indicated by the current reversal com-
parator or the beginning of the next clock cycle.
Thermal Protection
The total power dissipation in
is limited
by a thermal protection circuit. When the device
temperature rises to approximately 145℃, this cir-
cuit turns off the output, allowing the IC to cool.
The thermal protection circuit can protect the de-
vice from being damaged by overheating in the
event of fault conditions. Continuously running the
into thermal shutdown degrades device
reliability.
Current Limit
Current limit detection occurs during the off-time by
monitoring the current through the low-side switch
using an external resistor, RLIM. The current limit
value is defined by RLIM. If during the off-time the
current in the low-side switch exceeds the user
defined current limit value, the next on-time cycle
is immediately terminated. Current sensing is
achieved by comparing the voltage across the low
side FET with the voltage across the current limit
set resistor RLIM. For example, the current limit
value is 2.1A by the RLIM =50k. The current limit
value rises when the set resistor RLIM rises. The
maximum output current is set by RLIM: RLIM (kΩ) =
23• IMAX (A).
Oscillator Frequency
The
oscillator frequency is set by a sin-
gle external resistor connected between the RT pin
and the GND pin. The resistor should be located
very close to the device and connected directly to
the pins of the IC (RT and GND). An internal ampli-
fier holds the RT pin at a fixed voltage typically
0.6V. The oscillator frequency rises when the re-
sistor RT falls. To determine the timing resistance
for a given switching frequency, use the equation
below:
RT(kΩ)= [6500/fOSC(kHz)]
2
Setting Output Voltage
The output voltage is set with a resistor divider
from the output node to the FB pin. It is recom-
mended to use divider resistors with 1% tolerance
or better. To improve efficiency at very light loads
consider using larger value resistors. If the values
are too high the regulator is more susceptible to
noise and voltage errors from the FB input current
are noticeable. For most applications, a resistor in
the 10kΩ to 1MΩ range is suggested for R3. R2 is
then given by:
R2 = R3 • [(VOUT / VREF) – 1]
where VREF is 1.21V.
Output Cable Resistance Compensation
To compensate for resistive voltage drop across
the charger's output cable, the
inte-
grates a simple, user-programmable cable voltage
drop compensation using the impedance at the FB
pin. Choose the proper feedback resistance values
for cable compensation refer to the curve in Figure
1. The delta VOUT voltage rises when the feed-
back resistance R3 value rises. The delta VOUT
voltage rises when the feedback resistance R3
value rises, use the equation below:
ΔVOUT(V) = R3(kΩ) • IOUT(A)/1100
Figure 1. Delta Output Voltage vs. Load Current


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