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參數(shù)資料
| 型號(hào)： | MP8650DN-Z |
| 廠商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 19 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, QCC20 |
| 封裝： | 3 X 4 MM, MO-220VGED, QFN-20 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 233K |
| 代理商： | MP8650DN-Z |
MP8650 – 15A, 28V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP8650 Rev. 0.2
www.MonolithicPower.com
5
12/13/2007
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2007 MPS. All Rights Reserved.
OPERATION
The MP8650 is a current mode buck regulator.
That is, the EA output voltage is proportional to
the peak inductor current.
At the beginning of a cycle, SW is off. The EA
output voltage is higher than the current sense
amplifier output, and the current comparator’s
output is low. The rising edge of the CLK signal
sets the RS Flip-Flop. Its output turns on SW
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
and the Slope Compensation signal exceeds
the EA output voltage, the RS Flip-Flop is reset
and the MP8650 reverts to its initial SW off
state.
If the sum of the Current Sense Amplifier and
the Slope Compensation signal does not
exceed the COMP voltage, then 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 0.8V bandgap reference. The polarity is
such that a FB pin voltage lower than 0.8V
increases the EA output voltage. Since the EA
output voltage is proportional to the peak
inductor current, an increase in its voltage
increases current delivered to the output.
An external synchronous MOSFET supplies the
inductor current when the switch is off.
IN
EN
FB
SW
VCC
BG
GND
PG
BST
REGULATOR
OSCILLATOR
400KHz / 800KHz
DRIVER
CURRENT SENSE
AMPLIFIER
ERROR
AMPLIFIER
CURRENT
LIMIT
COMPARATOR
PWM
COMPARATOR
D
REGULATOR
REFERENCE
--
+
--
+
--
+
S
R
Q
--
+
COMP
Power
Good
VFB
VBG
SS/TRK
ISS
VCC
SYNCOUT
SYNCIN
VCC
VBC
VFB
DRIVER
Figure 2—Functional Block Diagram
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