参数资料
| 型号： | ISL6333IRZ |
| 厂商： | Intersil |
| 文件页数： | 19/40页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 3PHASE BUCK 48-QFN |
| 标准包装： | 43 |
| 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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ISL6333, ISL6333A, ISL6333B, ISL6333C
upper MOSFET and turns on the lower synchronous
MOSFET. When the modified V COMP voltage crosses the
modulator ramp, the PWM output transitions high, turning off
the synchronous MOSFET and turning on the upper
MOSFET. The PWM signal will remain high until the modified
V COMP voltage crosses the modulator ramp again. When this
occurs the PWM signal will transition low again.
During each PWM time interval, the PWM signal can only
transition high once. Once PWM transitions high it cannot
transition high again until the beginning of the next PWM
time interval. This prevents the occurrence of double PWM
pulses occurring during a single period.
Number of Active Channels
The default number of active channels on the controllers is
three for 3-phase operation. If 2-phase operation is desired,
the ISEN3- pin should be tied to the VCC pin. This will
disable Channel 3, so only Channel 1 and 2 will fire. In
2-phase operation all of the Channel 3 pins should be left
unconnected including the PHASE3, LGATE3, UGATE3,
BOOT3, and ISEN3+ pins.
PSI# (Low Power State) Operation
The controllers are designed to operate in both their normal
power state for high efficiency at heavy loads, and a low
power state to increase the regulator ’s light load efficiency.
EXTERNAL CIRCUIT
APA
ISL6333 INTERNAL CIRCUIT
The power state of the regulator is controlled by the PSI#
pin, which is a digital logic input. When this pin is set HIGH
the regulators will operate in their normal power state, with
all active channels firing in continuous conduction mode
C APA
R APA
V APA,TRIP
COMP
100μA
LOW
PASS
FILTER
+
-
APA
TO APA
CIRCUITRY
(CCM). When the PSI# pin is set LOW the controllers
change their operating state to the low power state to
increase light load efficiency. The different controllers have
different low power operating states as described in Table 1
and the following sections.
TABLE 1. POWER STATE OPERATION DESCRIPTION
ERROR
AMPLIFIER
PHASE
CCM OR
CONTROLLER
ISL6333,
PSI#
HIGH
COUNT
3/2-phase
DEM
CCM
GVOT
Yes
FIGURE 3. ADAPTIVE PHASE ALIGNMENT DETECTION
Adaptive Phase Alignment (APA)
To further improve the transient response, the controllers
ISL6333B
ISL6333A,
ISL6333C
LOW
HIGH
LOW
1-phase
3/2-phase
1-phase
DEM
CCM
CCM
Yes
No
No
also implement Intersil’s proprietary Adaptive Phase
Alignment (APA) technique, which turns on all of the
channels together at the same time during large current
step, high di/dt transient events. As Figure 3 shows, the APA
circuitry works by monitoring the voltage on the APA pin and
comparing it to a filtered copy of the voltage on the COMP
pin. The voltage on the APA pin is a copy of the COMP pin
voltage that has been negatively offset. If the APA pin
exceeds the filtered COMP pin voltage an APA event occurs
and all of the channels are forced on.
The APA trip level is the amount of DC offset between the
COMP pin and the APA pin. This is the voltage excursion
that the APA and COMP pin must have during a transient
event to activate the Adaptive Phase Alignment circuitry.
This APA trip level is set through a resistor, R APA , that
connects from the APA pin to the COMP pin. A 100μA
current flows across R APA into the APA pin to set the APA
trip level as described in Equation 3. An APA trip level of
500mV is recommended for most applications. A 1000pF
capacitor, C APA , should also be placed across the R APA
resistor to help with noise immunity.
It’s important to note that during soft-start and dynamic VID
transitions the PSI# pin is ignored and the controllers are
forced to run in their normal power state. The state of the
PSI# pin is considered again at the end of a successful
soft-start sequence or dynamic VID transition.
ISL6333, ISL6333B LOW POWER STATE
On the ISL6333 and ISL6333B, when the PSI# pin is set
LOW, the controllers change their operating state in multiple
ways. First, all active channels are turned off accept for
Channel 1. Channel 1 continues to operate but does so in
diode emulation mode (DEM). DEM only allows the upper and
lower MOSFETs to turn on to allow positive current to flow
through the output inductor. If the inductor current falls to 0A
during a switching cycle, both the lower and upper MOSFETs
are turned off to allow no negative current to build up in the
inductor. This helps to decrease the conduction losses of the
MOSFETs and the inductor at very low load currents.
When the ISL6333 and ISL6333B are operating in DEM, it’s
important for the controllers to know whether the output
V APA ( TRIP ) = R APA ? 100 × 10
– 6
(EQ. 3)
inductors are standard inductors or coupled inductors. PWM
operation is optimized for use with coupled inductors by
minimizing switching losses and body-diode conduction
19
FN6520.3
October 8, 2010
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| ISL6333IRZ-T | 功能描述:IC CTRLR PWM 3PHASE BUCK 48-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 |
| ISL6334ACRZ | 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 |
| ISL6334ACRZR5368 | 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 |
| ISL6334ACRZ-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 |
| ISL6334ACRZ-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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