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參數(shù)資料
| 型號(hào)： | EV2358DQ-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 2A, 23V, 370KHz Step-Down Converter |
| 中文描述： | 2A條，為23V，370KHz降壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 5/9頁(yè) |
| 文件大?。?/td> | 291K |
| 代理商： | EV2358DQ-00A |
MP2358 – 2A, 23V, 370KHz STEP-DOWN CONVERTER
MP2358 Rev. 1.3
3/23/2006
www.MonolithicPower.com
5
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
OPERATION
The MP2358 is a current mode regulator. That
is, the COMP pin voltage is proportional to the
peak inductor current. At the beginning of a
cycle: the upper transistor M1 is off; 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 370KHz
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 Current Sense Amplifier plus Slope
Compensation signal exceeds the COMP pin
voltage, the RS Flip-Flop is reset and the
MP2358 reverts to its initial M1 off, M2 on state.
If the Current Sense Amplifier plus 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 0.92V bandgap reference. The polarity is
such that a FB pin voltage lower than 0.92V
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 10
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.
MP2358_BD01
LOCKOUT
COMPARATOR
ERROR
AMPLIFIER
FREQUENCY
FOLDBACK
COMPARATOR
INTERNAL
REGULATORS
1.8V
SLOPE
COMP
CLK
CURRENT
COMPARATOR
CURRENT
SENSE
AMPLIFIER
SHUTDOWN
COMPARATOR
COMP
IN
EN
GND
OSCILLATOR
240KHz/
370KHz
S
R
Q
SW
BS
5V
+
Q
1.0V
+
+
2.50V/
2.29V
+
0.92V
0.4V
+
+
FB
--
--
--
--
--
--
SS
Figure 1—Functional Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EV2358DS-00A | 2A, 23V, 370KHz Step-Down Converter |
| EV2359DJ-00B | 1.2A, 24V, 1.4MHz Step-Down Converter in a TSOT23-6 |
| EV2360DG-00B | 1.8A, 24V, 1.4MHz Step-Down Converter |
| EV2361DK-00A | 2A, 1.4MHz Step-Down Converter Evaluation Board |
| EV2361DQ-00A | 2A, 1.4MHz Step-Down Converter Evaluation Board |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EV2358DS-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:2A, 23V, 370KHz Step-Down Converter |
| EV2359DJ-00B | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:1.2A, 24V, 1.4MHz Step-Down Converter in a TSOT23-6 |
| EV2360DG-00B | 制造商:Monolithic Power Systems 功能描述:EVAL KIT FOR 1.8A, 24V, 1.4MHZ STEP-DOWN CNVRTR IN 2MM X 2MM - Bulk |
| EV2361DK-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:2A, 1.4MHz Step-Down Converter Evaluation Board |
| EV2361DQ-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:2A, 23V, 1.4MHz Step-Down Converter |
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