参数资料
| 型号： | ISL6263CRZ |
| 厂商： | Intersil |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC VREG CORE 5BIT 1PHASE 32-QFN |
| 标准包装： | 60 |
| 应用： | 转换器，Intel IMVP-6 |
| 输入电压： | 5 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.41 V ~ 1.29 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 管件 |
ISL6263
frequency further improves efficiency by reducing switching
losses. The converter will automatically enter DEM after
eight consecutive PWM pulses where the PHASE pin has
detected positive voltage shortly after the LGATE pin has
gone high. The converter will return to CCM on the following
cycle after the PHASE pin detects negative voltage shortly
after the LGATE pin has gone high, indicating that the body
diode of the low-side MOSFET is conducting positive
inductor current. The converter inhibits the automatic 33%
change of V W whenever the audio filter is enabled.
Smooth mode transitions are facilitated by the R 3 modulator
which correctly maintains the internally synthesized ripple
current information throughout mode transitions.
Protection
The ISL6263 provides overcurrent protection (OCP),
overvoltage protection (OVP), and undervoltage protection
(UVP) as shown in Table 3.
Overcurrent protection is tied to the voltage droop, which is
determined by the resistors selected in the Static Droop
Design Using DCR Sensing section. After the load line is set,
the OCSET resistor can be selected. The OCP threshold
MOSFET body diode. The controller will remain latched in
the fault state until the VR_ON pin has been pulled below the
falling VR_ON threshold voltage V VR_ONL or until VDD has
gone below the falling POR threshold voltage VVDD_THF .
A severe-overvoltage protection fault occurs immediately
after the voltage between the VO and VSS pins exceed the
rising severe-overvoltage threshold V OVPS which is 1.545V,
the same reference voltage used by the VID DAC. The
ISL6263 will latch UGATE and PGOOD low but unlike other
protective faults, LGATE remains high until the voltage
between VO and VSS falls below approximately 0.77V, at
which time LGATE is pulled low. The LGATE pin will continue
to switch high and low at 1.545V and 0.77V until VDD has
gone below the falling POR threshold voltage VVDD_THF.
This provides maximum protection against a shorted high-
side MOSFET while preventing the output voltage from
ringing below ground. The severe-overvoltage fault circuit
can be triggered after another fault has already been
latched.
TABLE 3. FAULT PROTECTION SUMMARY OF ISL6263
FAULT
DURATION
detector is checked every 15μs and will increment a counter
if the OCP threshold is exceeded, conversely the counter will
FAULT TYPE
PRIOR TO
PROTECTION
PROTECTION
ACTIONS
FAULT
RESET
I OC ? R droop
R OCSET = ----------------------------------
10 μ A
be decremented if the load current is below the OCP
threshold. The counter will latch an OCP fault when the
counter reaches eight. The fastest OCP response for
overcurrent events occurring above the OCP threshold but
below twice the OCP threshold is 120μs, which is eight
counts at 15μs each. The ISL6263 will latch an OCP fault
within 2μs for an overcurrent exceeding twice the OCP
threshold to maximize protection against hard shorts. The
value of R OCSET is calculated as Equation 1:
(EQ. 1)
For example: The desired overcurrent trip level, I oc , is 30A,
R droop load-line is 8m Ω , Equation 1 gives R OCSET = 24k Ω .
Undervoltage protection is independent of the overcurrent
protection. If the output voltage measured on the VO pin is
less than +300mV below the voltage on the SOFT pin for
longer than 1ms, the controller will latch a UVP fault. If the
Overcurrent
Short Circuit
Overvoltage
(+200mV)
between VO pin
and SOFT pin
Severe
Overvoltage
(+1.55V)
between VO pin
and VSS pin
Undervoltage
(-300mV)
between VO pin
120μs
<2μs
1ms
Immediately
1ms
LGATE, UGATE, and Cycle
PGOOD latched low VR_ON or
VDD
LGATE, UGATE, and Cycle
PGOOD latched low VR_ON or
VDD
LGATE, UGATE, and Cycle
PGOOD latched low VR_ON or
VDD
UGATE, and Cycle
PGOOD latched low, VDD only
LGATE toggles ON
when VO>1.55V
OFF when
VO <0.77V
until fault reset
LGATE, UGATE, and Cycle
PGOOD latched low VR_ON or
VDD
output voltage measured on the VO pin is greater than
+200mV above the voltage on the SOFT pin for longer than
1ms, the controller will latch an OVP fault. Keep in mind that
V SOFT will equal the voltage level commanded by the VID
states only after the soft-start capacitor C SOFT has slewed to
the VID DAC output voltage. The UVP and OVP detection
circuits act on static and dynamic V SOFT voltage.
When an OCP, OVP, or UVP fault has been latched, PGOOD
becomes a low impedance and the gate driver outputs
UGATE and LGATE are pulled low. The energy stored in the
inductor is dissipated as current flows through the low-side
12
and SOFT pin
Gate-Driver Outputs LGATE and UGATE
The ISL6263 has internal high-side and low-side N-Channel
MOSFET gate-drivers. The LGATE driver is optimized for
low duty-cycle applications where the low-side MOSFET
conduction losses are dominant. The LGATE pull-down
resistance is very low in order to clamp the gate-source
voltage of the MOSFET below the V GS(th) at turnoff. The
current transient through the low-side gate at turnoff can be
considerable due to the characteristic large switching charge
of a low r DS(on) MOSFET.
FN9213.2
June 10, 2010
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6263DHRZ | IC VREG 3BIT 1PHASE 32-QFN |
| ISL6264CRZ | IC CORE CTRLR TWO-PHASE 40-QFN |
| ISL6265AHRTZ-T | IC CTRLR MULTI-OUTPUT 48-TQFN |
| ISL6265CHRTZ | IC CTRLR MULTI-OUTPUT 48TQFN |
| ISL6265HRTZ-T | IC CTLR MULTI-OUTPUT 48-TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6263CRZ-T | 功能描述:直流/直流开关调节器 1 PHS INT DC/DC BUCK CNTRLR FOR INTEL RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL6263DEVAL1Z | 功能描述:EVAL BAORD 1 FOR ISL6263D RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6263DHRZ | 功能描述:IC VREG 3BIT 1PHASE 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6263DHRZ-T | 功能描述:IC VREG 3BIT 1PHASE 32-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 |
| ISL6263EVAL1 | 制造商:Intersil Corporation 功能描述:ISL6263 EVALUATION BOARD 1 - IMVP LICENSE REQUIRED - Bulk |
发布紧急采购，3分钟左右您将得到回复。