参数资料
| 型号： | ISL6334ACRZ-TR5368 |
| 厂商： | Intersil |
| 文件页数： | 14/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE BUCK 40QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，Intel VR11.1 |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 带卷 (TR) |
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ISL6334AR5368
pin and ground. The PWM signals command the MOSFET
driver to turn on/off the channel MOSFETs.
For 4-channel operation, the channel firing order is 1-2-3-4:
PWM3 pulse happens 1/4 of a cycle after PWM4, PWM2
output follows another 1/4 of a cycle after PWM3, and
PWM1 delays another 1/4 of a cycle after PWM2. For
3-channel operation, the channel firing order is 1-2-3.
Connecting PWM4 to VCC selects three channel operation
and the pulse times are spaced in 1/3 cycle increments. If
level set by the controller IC. Therefore, the controller ’s
PWM outputs are directly compatible with Intersil drivers that
require 5V PWM signal amplitudes. Drivers requiring 3.3V
PWM signal amplitudes are generally incompatible.
Switching Frequency
Switching frequency is determined by the selection of the
frequency-setting resistor, R T , which is connected from FS
pin to GND or VCC. Equation 3 and Figure 3 are provided to
assist in selecting the correct resistor value.
R T = --------------------------
PWM3 is connected to VCC, two channel operation is
selected and the PWM2 pulse happens 1/2 of a cycle after
PWM1 pulse. If PWM2 is connected to VCC, only Channel 1
operation is selected. In addition, tie PSI# to GND to
configure for single or 2-phase operation with diode
10
2.5X10
F SW
where F SW is the switching frequency of each phase.
250
(EQ. 3)
emulation on remaining channel(s), Channel 1 or Channels
1 and 3.
200
When PSI# is asserted low, indicating the low power mode
operation of the processor, the controller drops the number of
active phases according to the logic on Table 1 for highlight
load efficiency performance. SS and FS pins are used to
program the controller in operation of non-coupled, 2-phase
coupled, or (n-x)-Phase coupled inductors. Different cases yield
different PWM output behaviors on both dropped phase(s) and
remained phase(s) as PSI# is asserted and de-asserted. A high
150
100
50
PSI# input signal pulls the controller back to normal CCM PWM
operation to sustain an immediate heavy transient load and
high efficiency. Note that “n-x” means n-x phase coupled and x
phase(s) are uncoupled.
TABLE 1. PSI# OPERATION DECODING
0
100k 200k 300k 400k 500k 600k 700k 800k 900k
SWITCHING FREQUENCY (Hz)
FIGURE 3. SWITCHING FREQUENCY vs RT
Current Sensing
1M
PSI#
FS
SS
The ISL6334AR5368 senses current continuously for fast
Non CI or (n-1) CI Drops to 1-phase
Non CI or (n-2) CI Drops to 2-phase
2-phase CI Drops to 1-phase
2-phase CI Drops to 2-phase
Normal CCM PWM Mode
0
0
0
0
1
0
0
1
1
x
0
1
0
1
x
response. The ISL6334AR5368 supports inductor DCR
sensing, or resistive sensing techniques. The associated
channel current sense amplifier uses the ISEN inputs to
reproduce a signal proportional to the inductor current, I L .
The sense current, I SEN , is proportional to the inductor
current. The sensed current is used for current balance,
The dropped PWM is forced low for 200ns (uncoupled case)
or until falling edge of coupled PWM (coupled case) then
pulled to VCC/2, while the remained PWM(s) sends out a
special 3-level PWM protocol that the dedicated VR11.1
drivers can decode and then enter diode emulation mode
with gate drive voltage optimization.
The ISL6334AR5368 only generates 2-level normal CCM
PWM except for faults. No dedicated VR11.1 driver is required.
While the controller is operational (VCC above POR,
EN_VTT and EN_PWR are both high,valid VID inputs), it can
pull the PWM pins to ~40% of VCC (~2V for 5V VCC bias)
during various stages, such as soft-start delay, phase
shedding operation, or fault conditions (OC or OV events).
The matching driver ’s internal PWM resistor divider can
further raise the PWM potential, but not lower it below the
14
load-line regulation, and overcurrent protection.
The internal circuitry, shown in Figures 4 and 5, represents
one channel of an N-channel converter. This circuitry is
repeated for each channel in the converter, but may not be
active depending on the status of the PWM2, PWM3 and
amplifier is typically 60nA; less than 5k Ω input impedance is
preferred to minimized the offset error.
INDUCTOR DCR SENSING
An inductor ’s winding is characteristic of a distributed
resistance, as measured by the DCR (Direct Current
Resistance) parameter. Consider the inductor DCR as a
separate lumped quantity, as shown in Figure 4. The
channel current I L , flowing through the inductor, will also
FN6839.2
September 7, 2010
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| ISL6334ACRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6334ACRZ-T W/GOLD BOND WIRE ONLY T&R - Tape and Reel |
| ISL6334AIRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6334AIRZR5368 | 功能描述:IC CTRLR PWM 4PHASE BUCK 40QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6334AIRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6334AIRZ-TR5368 | 功能描述:IC CTRLR PWM 4PHASE BUCK 40QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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