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HM1480 데이터시트(HTML) 6 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

부품명 HM1480
상세내용  Input range synchronous buck controller
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제조사  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
홈페이지  http://www.hmsemi.com/
Logo HMSEMI - Shenzhen Huazhimei Semiconductor Co., Ltd

HM1480 데이터시트(HTML) 6 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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The
HM1480 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 adjusts the peak inductor current accordingly.
Dual-channeling CV/CC mode control
H
M1480 provides the function of dual-channeling CV/CC mode control. The constant output current
control mode and constant output voltage control mode. CS pins are connected to the current sensing
resistors to prevent the condition of output short circuit and output over current.
Thermal Protection
The total power dissipation in
HM1480 is limited by a thermal protection circuit. When the device
temperature rises to approximately +125°C, this circuit turns off the output, allowing the IC to cool. The
thermal protection circuit can protect the device from being damaged by overheating in the event of fault
conditions. Continuously running the H
M1480 into thermal shutdown degrades device reliability.
Output Cable Resistance Compensation
To compensate for resistive voltage drop across the charger's output cable, the
HM1480 integrates 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. The delta
VOUT voltage rises when the feedback resistance R3 value rises. The delta VOUT voltage rises when
the feedback resistance R4 value rises, use the equation below:
V
1
R3
R4
V
R3
V
100mV
2.5μA
 
*From figure above, if Rcs=50mΩ, IOUT =1A, R3=660kΩ, Vcs= Rcs×IOUT=50mV, then ΔVOUT=0.8V.


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