参数资料
| 型号： | ISL6548CRZA |
| 厂商： | Intersil |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC REG/CTRLR ACPI DUAL DDR 28QFN |
| 标准包装： | 50 |
| 应用： | 存储器，DDR/DDR2 稳压器 |
| 电流 - 电源： | 7mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN（6x6） |
| 包装： | 管件 |
ISL6548
critical because they switch large amounts of energy, and
therefore tend to generate large amounts of noise. Next are
the small signal components which connect to sensitive
nodes or supply critical bypass current and signal coupling.
12V ATX
P12V
GNDP
C BP
5VDUAL
A multi-layer printed circuit board is recommended. Figure 2
shows the connections of the critical components in the
5VSBY
5VSBY
C BP
C IN
converter. Note that capacitors C IN and C OUT could each
represent numerous physical capacitors. Dedicate one solid
layer, usually a middle layer of the PC board, for a ground
ISL6548
UGATE
PHASE
Q 1
L 1
V DDQ
plane and make all critical component ground connections
with vias to this layer. Dedicate another solid layer as a
power plane and break this plane into smaller islands of
LGATE
COMP
Q 2
C OUT1
common voltage levels. Keep the metal runs from the
PHASE terminals to the output inductor short. The power
plane should support the input power and output power
nodes. Use copper filled polygons on the top and bottom
FB
C 2
R 2
R 4
C 1
R 1
C 3 R 3
circuit layers for the phase nodes. Use the remaining printed
circuit layers for small signal wiring. The wiring traces from
the GATE pins to the MOSFET gates should be kept short
VDDQ(2)
V DDQ
and wide enough to easily handle the 1A of drive current.
In order to dissipate heat generated by the internal V TT
LDO, the ground pad, pin 29, should be connected to the
internal ground plane through at least four vias. This allows
the heat to move away from the IC and also ties the pad to
the ground plane through a low impedance path.
The switching components should be placed close to the
ISL6548 first. Minimize the length of the connections
VTT(2)
DRIVE4
FB4
C OUT2
V TT
Q 3
between the input capacitors, C IN , and the power switches
by placing them nearby. Position both the ceramic and bulk
input capacitors as close to the upper MOSFET drain as
DRIVE3
R 5
Q 4
C OUT3
V GMCH
possible. Position the output inductor and output capacitors
FB3
between the upper and lower MOSFETs and the load.
The critical small signal components include any bypass
capacitors, feedback components, and compensation
components. Place the PWM converter compensation
REFADJ4
R 6
C OUT4
components close to the FB and COMP pins. The feedback
resistors should be located as close as possible to the FB
pin with vias tied straight to the ground plane as required.
Feedback Compensation - PWM Buck Converter
Figure 3 highlights the voltage-mode control loop for a
DRIVE2_U
FB2
DRIVE2_L
R 8
R 7
Q 6
Q 5
V TT_GMCH/CPU
C OUT4
synchronous-rectified buck converter. The output voltage
GND PAD
(V OUT ) is regulated to the Reference voltage level. The error
amplifier output (V E/A ) is compared with the oscillator (OSC)
triangular wave to provide a pulse-width modulated (PWM)
wave with an amplitude of V IN at the PHASE node. The
PWM wave is smoothed by the output filter (L O and C O ).
The modulator transfer function is the small-signal transfer
KEY
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT AND/OR POWER PLANE LAYER
VIA CONNECTION TO GROUND PLANE
function of V OUT /V E/A . This function is dominated by a DC
Gain and the output filter (L O and C O ), with a double pole
break frequency at F LC and a zero at F ESR . The DC Gain of
the modulator is simply the input voltage (V IN ) divided by the
peak-to-peak oscillator voltage ? V OSC .
11
FIGURE 2. PRINTED CIRCUIT BOARD POWER PLANES
AND ISLANDS
FN9188.2
January 3, 2006
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6551IR-T | IC REG CTRLR FLYBACK PWM 28-QFN |
| ISL6552CR-T | IC REG CTRLR BUCK PWM 20-QFN |
| ISL6553CB-T | IC REG CTRLR BUCK PWM 16-SOIC |
| ISL6554CB-T | IC PWM CORE VOLTAGE REG 20-SOIC |
| ISL6556ACR-T | IC CTRLR MULTIPHASE VRM10 32-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6548CRZA-T | 功能描述:电压模式 PWM 控制器 W/ANNEAL 4-IN-1G FOR DDR/I915/925 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6549CA | 功能描述:IC REG DL BCK/LINEAR 16-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| ISL6549CA-T | 功能描述:IC REG DL BCK/LINEAR 16-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| ISL6549CAZA | 功能描述:IC REG DL BCK/LINEAR 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| ISL6549CAZAS2698 | 功能描述:IC REG DL BCK/LINEAR 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
发布紧急采购，3分钟左右您将得到回复。