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參數(shù)資料
| 型號： | L6917BDTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | SO-28 |
| 文件頁數(shù)： | 24/33頁 |
| 文件大?。?/td> | 631K |
| 代理商： | L6917BDTR |
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L6917B
30/33
High Current DC-DC: 12VIN - 3.3 (or 5V) OUT - 35A
Figure 27 shows the device in a high current server power supply application.
Adding an external resistor divider after the remote sense buffer gives the possibility to increase the regulated
voltage. Considering for example a divider by two (two equal resistors) the DAC range is doubled from 2.200V
to 3.700V with 50mV binary steps. The external resistor divider must be designed in order to give negligible ef-
fects to the remote buffer gain, this means that the resistors value must be much lower than the remote buffer
input resistance (20k
). In this way, it is possible to regulate the 3.3V and 2.5V rails from the 12V available from
the AC/DC converter. The 5V rail can be obtained with further modifications to the external divider. The regulator
assures all the advantages of the dual phase conversion especially in the 5V conversion where the duty cycle
is near the 50% and practically no ripple is present in the input capacitors.
The board is able to deliver up to 35A "thermal" at Tamb 25°C without airflow. Higher currents can be reached
for reasonable times considering the overall dynamic thermal capacitance.
Figure 27. Server power supply schematic
The following part list refers to the following application:
– Input Voltage: 12V;
– Output voltage: 3.3V;
– Oscilator frequency: 200kHz;
– Output voltage tolerance (over static and dynamic conditions): ±2.5%.
PGOOD
PGND
PGNDS2
ISEN2
LGATE2
VSEN
FB
PHASE2
UGATE2
BOOT2
VCC
COMP
SGND
OSC / INH
VID0
VID1
VID2
VID3
VID4
PGNDS1
ISEN1
LGATE1
PHASE1
UGATE1
BOOT1
VCCDR
6
24
25
26
27
16
15
2
5
4
3
1
13
14
22
21
20
18
19
7
28
23
10
9
8
11
12
FBR
FBG
17
C1
R7
R8
C2
R4
R3
Q3
Q4
C3
L2
C7
R10
D3
C6
C11..C13
C14,
C23
R1
JP3
R2
S1
S0
S3
S2
S4
R5
R6
Q1
L1
Q2
C4
D4
C5
Vin
GNDin
GNDCORE
VoutCORE
PGOOD
FBG
FBR
U1
L6917B
DZ1
C8
JP2
JP1
R13
R15
R12
R14
C9,C10
R9
R18
D1
R17
R16
Q1a
Q3a
D2
R19
R20
JP5
JP4
Vcc
GNDcc
JP6
To Vcc
Rosc
相關PDF資料 |
PDF描述 |
|---|---|
| L6917D | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6918ADTR | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6918AD | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6919CD | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6919E | SWITCHING CONTROLLER, PDSO28 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6917D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| L6917DTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| L6918 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| L6918A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| L6918AD | 功能描述:DC/DC 開關控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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