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MPQ2362-AEC1 데이터시트(PDF) 9 Page - Monolithic Power Systems

부품명 MPQ2362-AEC1
부품 상세설명  Dual 2A, 23V, 380kHz Step-Down Converter with Frequency Synchronization with AEC-Q100 Qualified
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제조업체  MPS [Monolithic Power Systems]
홈페이지  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MPQ2362-AEC1 데이터시트(HTML) 9 Page - Monolithic Power Systems

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MPQ2362
— DUAL 2A, 23V, 380kHz STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED
MPQ2362 Rev. 1.0
www.MonolithicPower.com
9
5/24/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
OPERATION
The MPQ2362 is a dual channel current mode
regulator. The COMP pin voltage is proportional
to the peak inductor current. At the beginning of
a cycle, the upper transistor M1 is off, and the
lower transistor M2 is on (see Figure 1). The
COMP pin voltage is higher than the current
sense
amplifier
output,
and
the
current
comparator’s output is low. The rising edge of
the 380KHz CLK signal sets the RS Flip-Flop.
Its output turns off M2 and turns on M1 thus
connecting the SW pin and inductor to the input
supply. The increasing inductor current is
sensed and amplified by the Current Sense
Amplifier. Ramp compensation is summed to
Current Sense Amplifier output and compared
to the Error Amplifier output by the Current
Comparator.
When the sum of the Current Sense Amplifier
output and the Slope Compensation signal
exceeds the COMP pin voltage, the RS Flip-
Flop is reset and the MPQ2362 reverts to its
initial M1 off, M2 on state.
If the sum of the Current Sense Amplifier output
and the Slope Compensation signal does not
exceed the COMP voltage, the falling edge of
the CLK resets the Flip-Flop.
The output of the Error Amplifier integrates the
voltage difference between the feedback and
the 1.22V bandgap reference. The polarity is
such that a voltage at the FB pin lower than
1.22V increases the COMP pin voltage. Since
the COMP pin voltage is proportional to the
peak inductor current, an increase in its voltage
increases current delivered to the output. The
lower 10Ω switch ensures that the bootstrap
capacitor voltage is charged during light load
conditions. External Schottky Diode D1 carries
the inductor current when M1 is off (see Figure 1).
Figure 1
—Functional Block Diagram
(Diagram portrays ½ of the MPQ2362)


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