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參數(shù)資料
| 型號： | MP2370DJ-LF-Z |
| 廠商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 1700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MO-193AB, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 485K |
| 代理商： | MP2370DJ-LF-Z |
MP2370 – 1.2A, 24V, 1.4MHz STEP-DOWN WHITE LED DRIVER IN A TSOT23-6
MP2370 Rev. 0.96
www.MonolithicPower.com
5
9/21/2007
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2007 MPS. All Rights Reserved.
OPERATION
The MP2370 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 0.15V bandgap reference. The polarity is
such that a FB pin voltage lower than 0.15V
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/700KHz
RAMP
GENERATOR
DRIVER
CURRENT SENSE
AMPLIFIER
ERROR
AMPLIFIER
CURRENT
LIMIT
COMPARATOR
PWM
COMPARATOR
D
x20
M1
REGULATOR
REFERENCE
EA
--
+
--
+
--
+
S
R
Q
--
+
27pF
0.15V
1pF
Figure 1—Functional Block Diagram
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| MP2371DG-LF-Z | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.8A 24V 700kHz Nonsync Step-Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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| MP2378DS-LF-Z | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2A 30V 385KHz Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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