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HM8116A データシート(PDF) 7 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

部品番号. HM8116A
部品情報  Standoff 42V 1.2A 800KHz Sync Step-Down Regulator
ダウンロード  13 Pages
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メーカー  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
ホームページ  http://www.hmsemi.com/
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HM8116A Datasheet(HTML) 7 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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Standoff 42V 1.2A 800KHz Sync Step-Down Regulator
Functional Block Diagram
Bias&Ref
Regulator
Error Amplifier
Slope
Compensation
Comparator
Fault
Detection
0.8/2MHz
Clock
OTP
Driver
Valley Curve
Detection
Peak Curve
Detection
EN
FB
IN
BS
SW
GND
Block Diagram
Functions Description
Internal Regulator
The HM8116A is a current mode step down DC/DC converter that provides excellent transient response with no extra
external compensation components. This device contains an internal, low resistance, high voltage power MOSFET,
and operates at a high 800KHz operating frequency to ensure a compact, high efficiency design with excellent AC
and DC performance.
Error Amplifier
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) and outputs a current
proportional to the difference between the two. This output current is then used to charge or discharge the internal
compensation network, which is used to control the power MOSFET current. The optimized internal compensation
network minimizes the external component counts and simplifies the control loop design.
Under-Voltage Lockout (UVLO)
Under-voltage lockout (UVLO) protects the chip from operating at an insufficient supply voltage. UVLO protection
monitors the internal regulator voltage. When the voltage is lower than UVLO threshold voltage, the device is shut
off. When the voltage is higher than UVLO threshold voltage, the device is enabled again.
Thermal Shutdown
Thermal shutdown prevents the chip from operating at exceedingly high temperatures. When the silicon die
temperature exceeds 150°C, it shuts down the whole chip. When the temperature falls below its lower threshold
(Typ. 130°C) the chip is enabled again.
HM8116A


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