- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383159 > ISL6568IRZ (INTERSIL CORP) Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications PDF資料下載
參數(shù)資料
| 型號： | ISL6568IRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications |
| 中文描述： | SWITCHING CONTROLLER, 275 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, MO-220-VHHD, QFN-32 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 716K |
| 代理商： | ISL6568IRZ |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁當(dāng)前第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
16
FN9187.3
July 25, 2005
335kHz to make a 1.1V to 1.5V reference voltage change is
about 100
μ
s, as calculated using the following equation.
Advanced Adaptive Zero Shoot-Through Deadtime
Control (Patent Pending)
The integrated drivers incorporate a unique adaptive deadtime
control technique to minimize deadtime, resulting in high
efficiency from the reduced freewheeling time of the lower
MOSFET body-diode conduction, and to prevent the upper and
lower MOSFETs from conducting simultaneously. This is
accomplished by ensuring either rising gate turns on its
MOSFET with minimum and sufficient delay after the other has
turned off.
During turn-off of the lower MOSFET, the PHASE voltage is
monitored until it reaches a -0.3V/+0.8V trip point for a
forward/reverse current, at which time the UGATE is released
to rise. An auto-zero comparator is used to correct the r
DS(ON)
drop in the phase voltage preventing false detection of the
-0.3V phase level during r
DS(ON)
conduction period. In the
case of zero current, the UGATE is released after 35ns delay of
the LGATE dropping below 0.5V. During the phase detection,
the disturbance of LGATE falling transition on the PHASE node
is blanked out to prevent falsely tripping. Once the PHASE is
high, the advanced adaptive shoot-through circuitry monitors
the PHASE and UGATE voltages during a PWM falling edge
and the subsequent UGATE turn-off. If either the UGATE falls
to less than 1.75V above the PHASE or the PHASE falls to less
than +0.8V, the LGATE is released to turn on.
Internal Bootstrap Device
Both integrated drivers feature an internal bootstrap schottky
diode. Simply adding an external capacitor across the BOOT
and PHASE pins completes the bootstrap circuit. The
bootstrap function is also designed to prevent the bootstrap
capacitor from overcharging due to the large negative swing
at the PHASE node. This reduces voltage stress on the boot
to phase pins.
The bootstrap capacitor must have a maximum voltage
rating above PVCC + 5V and its capacitance value can be
chosen from the following equation:
where Q
G1
is the amount of gate charge per upper MOSFET
at V
GS1
gate-source voltage and N
Q1
is the number of
control MOSFETs. The
V
BOOT_CAP
term is defined as the
allowable droop in the rail of the upper gate drive.
Gate Drive Voltage Versatility
The ISL6568 provides the user flexibility in choosing the
gate drive voltage for efficiency optimization. The controller
ties the upper and lower drive rails together. Simply applying
a voltage from 5V up to 12V on PVCC sets both gate drive
rail voltages simultaneously.
Initialization
Prior to initialization, proper conditions must exist on the
ENLL, VCC, PVCC and the VID pins. When the conditions are
met, the controller begins soft-start. Once the output voltage is
within the proper window of operation, the controller asserts
PGOOD.
Enable and Disable
While in shutdown mode, the PWM outputs are held in a
high-impedance state. This forces the drivers to short gate-
to-source of the upper and lower MOSFET’s to assure the
MOSFETs remain off. The following input conditions must be
met before the ISL6566 is released from this shutdown
mode.
1. The bias voltage applied at VCC must reach the internal
power-on reset (POR) rising threshold. Once this
threshold is reached, proper operation of all aspects of
the ISL6568 is guaranteed. Hysteresis between the rising
and falling thresholds assure that once enabled, the
ISL6568 will not inadvertently turn off unless the bias
voltage drops substantially (see
Electrical
Specifications
).
(EQ. 11)
t
DVID
1
f
S
----
V
-----------------
1.5
+
=
C
BOOT_CAP
Q
BOOT_CAP
-------------------------------------
≥
Q
GATE
Q
-----------------------------------
PVCC
GS1
N
Q1
=
(EQ. 12)
50nC
20nC
FIGURE 10. BOOTSTRAP CAPACITANCE vs BOOT RIPPLE
VOLTAGE
V
BOOT_CAP
(V)
C
B
(
μ
F
1.6
1.4
1.2
1.
0.8
0.6
0.4
0.2
0.0
0.3
0.0
0.1
0.2
0.4
0.5
0.6
0.9
0.7
0.8
1.0
Q
GATE
= 100nC
ISL6568
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6568IRZ-T | Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications |
| ISL6568IRZA | Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications |
| ISL6568IRZA-T | Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications |
| ISL6568CRZA-T | VP Fixed Series, 500 Ohms, 50.0 W, Fixed, Wirewound Resistor |
| ISL6568CR-T | Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6568IRZA | 功能描述:IC CTRLR PWM BUCK 2PHASE 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6568IRZA-T | 功能描述:IC CTRLR PWM BUCK 2PHASE 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6568IRZR5184 | 功能描述:IC CTRLR PWM 2PHASE BUCK 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6568IRZ-T | 功能描述:IC CTRLR PWM BUCK 2PHASE 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6568IRZ-TR5184 | 功能描述:IC CTRLR PWM 2PHASE BUCK 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。