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參數(shù)資料
| 型號： | EV2359DJ-00B |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 1.2A, 24V, 1.4MHz Step-Down Converter in a TSOT23-6 |
| 中文描述： | 1.2A電流，24V的，1.4MHz的降壓轉(zhuǎn)換器中的TSOT23 - 6 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大小： | 383K |
| 代理商： | EV2359DJ-00B |
MP2359 – 1.2A, 24V, 1.4MHz STEP-DOWN CONVERTER IN A TSOT23-6
MP2359 Rev. 1.1
6/23/2006
www.MonolithicPower.com
5
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
OPERATION
The MP2359 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, M1 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 1.4MHz
CLK signal sets the RS Flip-Flop. Its output
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 the Current Sense
Amplifier output and compared to the Error
Amplifier output by the PWM Comparator.
When the sum of the Current Sense Amplifier
output and the Slope Compensation signal
exceeds the EA output voltage, the RS Flip-
Flop is reset and M1 is turned off. The external
Schottky rectifier diode (D1) conducts the
inductor current.
If the sum of the Current Sense Amplifier output
and the Slope Compensation signal does not
exceed the EA output for a whole cycle, 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 0.81V bandgap reference. The polarity is
such that a FB pin voltage lower than 0.81V
increases the EA output voltage. Since the EA
output voltage is proportional to the peak
inductor current, an increase in its voltage also
increases current delivered to the output.
5
IN
EN
FB
GND
SW
BST
4
3
2
1
6
REGULATOR
OSCILLATOR
1.4MHz/460KHz
RAMP
GENERATOR
DRIVER
CURRENT SENSE
AMPLIFIER
-
+
ERROR
AMPLIFIER
CURRENT
LIMIT
COMPARATOR
PWM
COMPARATOR
D
x20
M1
REGULATOR
REFERENCE
EA
--
+
--
+
--
+
S
R
R
Q
27pF
1pF
Figure 1—Functional Block Diagram
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相關代理商/技術參數(shù) |
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| 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 |
| EV2363DN-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 27V, 365KHz Step-Down Converter |
| EV2364DF-00A | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:4 Output DSL Power Supply |
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