- 您现在的位置：买卖IC网 > PDF目录15164 > ISL9506HRZ-T (Intersil)IC REG CTRLR BUCK PWM 40-QFN PDF资料下载
参数资料
| 型号： | ISL9506HRZ-T |
| 厂商： | Intersil |
| 文件页数： | 20/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 40-QFN |
| 标准包装： | 4,000 |
| 系列： | Robust Ripple Regulator™ (R³) |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -10°C ~ 100°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页
ISL9506
sourcing/sinking current capability range, when the power
The desired V OUT slew rate will determine the choice of the
C SOFT = ------------------------------------
monitor loading changes 1mA, the output of the power
monitor will change 7mV. The 7 Ω impedance is associated
with the layout and packaging resistance of PMON pin inside
SOFT capacitor, C SOFT , by Equation 3:
I GV
SLEWRATE
(EQ. 3)
the IC. Compared to the load resistance on the power
monitor pin in practical applications, 7 Ω output impedance
contributes no significance of error.
Using a SLEWRATE of 10mV/μs, and the typical I GV value,
given in the Electrical Specification Table of 205μA, C SOFT is
calculated by using Equation 4:
C SOFT = ------------------ = 0.0205 μ F
10mV
1 μ s
Component Selection and Application
Soft-Start and Mode Change Slew Rates
205 μ A
----------------
(EQ. 4)
The ISL9506 uses 2 slew rates for various modes of
operation. The first is a slow slew rate, used to reduce inrush
current on start-up. It is also used to reduce audible noise
when entering or exiting Diode Emulation Mode. A faster
slew rate is used to exit out of Diode Emulation and to
increase system performance by achieving nominal mode
regulation more quickly. Note that the SOFT capacitor
A choice of 0.015μF would guarantee a SLEWRATE of
10mV/μs is met for minimum I GV value, given in the
Now this choice of C SOFT will then control the start-up
slewrate as well. One should expect the output voltage to
slew to the start value of 1.2V at a rate given by Equation 5:
dV I SS 42 μ A mV
0.015 μ F
μ s
C SOFT
current is bidirectional and is flowing into the SOFT capacitor
when the output voltage is commanded to rise, and out of
------- = ------------------- = ----------------------- = 2.8 ---------
dt
(EQ. 5)
the SOFT capacitor when the output voltage is commanded
to fall.
The two slew rates are determined by the currents into the
SOFT pin. As can be seen in Figure 44, the SOFT pin has a
capacitance to ground. Also, the SOFT pin is the input to the
error amplifier and is, therefore, the commanded system
voltage. Depending on the state of the system, i.e. Start-Up
or Nominal mode, and the state of the DE_EN pin, one of the
two currents shown in Figure 44 will be used to charge or
discharge this capacitor, thereby controlling the slew rate of
the commanded voltage. These currents can be found under
the Soft Current section of the Electrical Specifications Table
ISL9506
Generally, when output voltage is approaching its steady
state, its dv/dt will slow down to prevent overshoot. In order
to compensate the slow-down effect, faster initial dv/dt slew
rates can be used with small soft capacitors such as 10nF to
achieve the desired overall dv/dt in the allocated time
interval.
Selecting R BIAS
To properly bias the ISL9506, a reference current is
established by placing a 147k Ω , 1% tolerance resistor from
the R BIAS pin to ground. This will provide a highly accurate,
10μA current source from which OCSET reference current
can be derived.
Care should be taken in layout that the resistor is placed
very close to the R BIAS pin and that a good quality signal
ground is connected to the opposite side of the R BIAS
resistor. Do not connect any other components to this pin.
I SS
I 2
ERROR
AMPLIFIER
Capacitance on this pin would create instabilities and should
be avoided.
SOFT
+
+
Start-up Operation - PGD_N and PGOOD
The ISL9506 provides a 3.3V logic output pin for PGD_N.
The 3V3 pin allows for a system 3.3V source to be
connected to separated circuitry inside the ISL9506, solely
C SOFT
V REF
devoted to the PGD_N function. The output is a 3.3V CMOS
signal with 4mA of source and sinking capability. This
implementation removes the need for an external pull-up
FIGURE 44. SOFT PIN CURRENT SOURCES FOR FAST AND
SLOW SLEW RATES
The first current, labeled I SS , is given in the specification
table as 42μA. This current is used during Soft-Start. The
second current, I 2 sums with I SS to get the large current
This total current is typically 205 μ A with a minimum of
180μA.
20
resistor on this pin, and due to the normal level of this signal
being a low, removes the leakage path from the 3.3V supply
to ground through the pull-up resistor. This reduces 3.3V
supply current, that would occur under normal operation with
a pull-up resistor, and prolongs battery life. The 3.3V supply
should be decoupled to digital ground, not to analog ground
for noise immunity.
FN6722.0
August 13, 2008
相关PDF资料 |
PDF描述 |
|---|---|
| VE-J51-EY-F4 | CONVERTER MOD DC/DC 12V 50W |
| RGM08DTAS-S189 | CONN EDGECARD 16POS R/A .156 SLD |
| H2BBG-10102-B4-ND | JUMPER-H1501TR/A2015B/H1501TR 2" |
| VE-J51-EY-F2 | CONVERTER MOD DC/DC 12V 50W |
| ISL6307AIRZ-T | IC REG CTRLR BUCK PWM VM 48-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL9517HRZ | 功能描述:IC CHRGR VDC BATT 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| ISL9517HRZ-T | 功能描述:IC CHRGR VDC BATT 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| ISL9518AHRTZ | 功能描述:电池管理 TQFN ISL9518A NOTEBOOK BATRY CHRGR RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| ISL9518AHRTZ-T | 功能描述:电池管理 TQFN ISL9518A NOTEBOOK BATRY CHRGR RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| ISL9518HRTZ | 功能描述:电池管理 TQFN ISL9518 NOTEBOOK BATRY CHRGR RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。