- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄97867 > DS21Q48N (DALLAS SEMICONDUCTOR) DATACOM, PCM TRANSCEIVER, PBGA144 PDF資料下載
參數(shù)資料
| 型號： | DS21Q48N |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Digital Transmission Interface |
| 英文描述： | DATACOM, PCM TRANSCEIVER, PBGA144 |
| 封裝： | BGA-144 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 296K |
| 代理商： | DS21Q48N |
MAX863
Dual, High-Efficiency, PFM, Step-Up
DC-DC Controller
14
______________________________________________________________________________________
Set Feedback Compensation
External voltage feedback to the MAX863 should be
compensated for stray capacitance and EMI in the
feedback network. Proper compensation is achieved
when the MAX863 switches evenly, rather than in wide-
ly spaced bursts of pulses with large output ripple.
Typically, lead compensation consisting of a 10pF to
220pF ceramic capacitor (C1 in Figure 7) across the
upper feedback resistor is adequate. Circuits with
VOUT or VDD greater than 7.5V may require a second
capacitor across the lower feedback resistor. Initially,
choose this capacitor so that R2C2 = R1C1. Set the
final values of the compensation capacitors based on
empirical analysis of a prototype.
PC Board Layout and Routing
High switching speeds and large peak currents make
PC board layout an important part of design. Poor lay-
out can cause excessive EMI and ground-bounce, both
of which can cause instability or regulation errors by
corrupting the voltage and current-feedback signals.
Place power components as close together as possi-
ble, and keep their traces short, direct, and wide. Keep
the extra copper on the board and integrate it into
ground as an additional plane. On multi-layer boards,
avoid interconnecting the ground pins of the power
components using vias through an internal ground
plane. Instead, place the ground pins of the power
components close together and route them in a “star”
ground configuration using component-side copper,
then connect the star ground to the internal ground
plane using multiple vias.
The current-sense resistor and voltage-feedback net-
works should be very close to the MAX863. Noisy
traces, such as from the EXT pins, should be kept away
from the voltage-feedback networks and isolated from
them using grounded copper. Consult the MAX863
evaluation kit manual for a full PC board example.
MAX863
EXT2
CS2
VOUT2 = 24V, 35mA
VOUT1 = 5V
VIN = 1.8V TO VOUT1
N1B
IRF7103
C7
0.1
F
R4
49.9k
1%
C6
15pF
C5
22
F
35V
0.1
R2
100m
R3
909k
1%
N1A
R1
50m
R7
100k
C1
220
F
10V
≤0.1
R5
R6
D1
MBRS340T3
D2
MBRS140
L1
10
H
2A
L2
10
H
1A
C3
100
F
10V
≤0.1
C4
100
F
10V
≤0.1
C2
0.1
F
ON/OFF
FB2
SHDN1
EXT1
CS1
LBO
LOW-BATTERY
DETECTOR OUTPUT
LBI
SENSE1
VDD
BOOT
GND
SHDN2
REF
PGND
FB1
C8
270pF
Figure 8. Bootstrapped 3.3V Logic and 24V LCD Bias Supply
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS21Q48 | DATACOM, PCM TRANSCEIVER, PBGA144 |
| DS21Q552 | DATACOM, PCM TRANSCEIVER, PBGA256 |
| DS2250-32-16 | 8-BIT, 16 MHz, MICROCONTROLLER, SMA40 |
| DS2250T-32-16 | 8-BIT, 16 MHz, MICROCONTROLLER, SMA40 |
| DS2250-8-16 | 8-BIT, 16 MHz, MICROCONTROLLER, DMA40 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS21Q48NB | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q50 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Quad E1 Transceiver |
| DS21Q50L | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q50L+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21Q50L-C01 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。