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參數(shù)資料
| 型號： | AND8079 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | A Low Cost DDR Memory Power Supply Using the NCP1571 Synchronous Buck Converter and a LM358 Based Linear Voltage Regulator |
| 中文描述： | 一種低成本的DDR記憶體電源使用NCP1571同步降壓轉(zhuǎn)換器和基于線性穩(wěn)壓器1 LM358 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 150K |
| 代理商： | AND8079 |
AND8079/D
http://onsemi.com
5
Schottky Diode for Synchronous MOSFET
The efficiency of the buck converter can be improved
slightly by placing a Schottky diode (D
1
) in parallel with the
bottom MOSFET (Q
3
). The body diode of Q
3
is used to
conduct current during the non-overlap time when both the
top (Q
2
) and bottom (Q
3
) MOSFETs are turned OFF. But
because the non-overlap time is only approximately 50 ns
for the NCP1571’s 200 kHz switching speed, the efficiency
savings will be only approximately 1.0%. The
demonstration board included a provision for D
1
; however,
the performance of the circuit was not testing with this
diode.
Experimental Results
The experimental results of the demonstration PCB are
shown in Figures 4 through 20. Figure 3 shows the test setup
used to create the current load transients for the V
tt
supply
voltage. The transient current load tests for the V
dd
and V
tt
supply voltages were created using a Kikusui Electronic
Load Controller. Unless noted, the standard test conditions
are as listed below:
1. Ambient Temperature = 23 C
2. V
dd
Current Load (I
Vdd
) = 8.0 A
3. V
tt
Current Load (I
Vtt
) = 1.25 A source load
4. V
REF
Current Load (I
REF
) = 2.5 mA
5. 5.0 V Input Voltage = 5.00 V
6. 12 V Input Voltage = 12.00 V
7. -12 V Input Voltage = -12.00 V
Figure 3. V
tt
Transient Load Test Setup for a 2.0 A Sink to 2.0 A Source Test
2.5 V
V
dd
R7
OUT
+
-
+
-
-
Q4
U2A
V
REF
Q5
C22
+
C23
+
V
tt
V
tt
DDR Circuit
2.0 A
DC Current Source
Pulsating Current Source
Pulse Width = 100 ms
Period = 200 ms
l1 = 0 A
l2 = 4.0 A
Rise Time = 50 s
Fall Time
= 50 s
V
tt
Circuit
DC Current Source
Pulsating Current Source
0 A
2 .0 A
2.0 A
V
tt
2.0 A Current Sink Test
V
tt
Circuit
DC Current Source
Pulsating Current Source
4 A
V
tt
2.0 A Current Source Test
2 .0 A
2.0 A
+
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AND8079D | A Low Cost DDR Memory Power Supply Using the NCP1571 Synchronous Buck Converter and a LM358 Based Linear Voltage Regulator |
| AND8085 | An Introduction to FST |
| AND8085D | An Introduction to FST |
| AND8090 | AC Characteristics of ECL Devices |
| AND8090D | AC Characteristics of ECL Devices |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AND8079D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:A Low Cost DDR Memory Power Supply Using the NCP1571 Synchronous Buck Converter and a LM358 Based Linear Voltage Regulator |
| AND8085 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:An Introduction to FST |
| AND8085D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:An Introduction to FST |
| AND8090 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:AC Characteristics of ECL Devices |
| AND8090D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:AC Characteristics of ECL Devices |
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