- 您现在的位置：买卖IC网 > PDF目录17644 > ISL62392CHRTZ (Intersil)IC PWR SUPPLY CTRLR 28TQFN PDF资料下载
参数资料
| 型号： | ISL62392CHRTZ |
| 厂商： | Intersil |
| 文件页数： | 17/21页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CTRLR 28TQFN |
| 标准包装： | 75 |
| 应用： | 电源控制器，笔记本电脑 |
| 电源电压： | 5.5 V ~ 25 V |
| 电流 - 电源： | 150µA |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
ISL62391, ISL62392, ISL62391C, ISL62392C
R BOTTOM = -------------------------------------
V REF ? R TOP
V OUT – V REF
(EQ. 14)
exceeds +150 ° C, all outputs will be turned off to sharply curtail
power dissipation. The outputs will remain off until the junction
temperature has fallen below +135 ° C.
Compensation Design
Figure 27 shows the recommended Type-II compensation
circuit. The FB pin is the inverting input of the error amplifier.
The COMP signal, the output of the error amplifier, is inside the
chip and unavailable to users. C INT is a 100pF capacitor
integrated inside the IC that connects across the FB pin and the
COMP signal. R TOP , R FB , C FB and C INT form the Type-II
compensator. The frequency domain transfer function is given
by Equation 15:
General Application Design Guide
This design guide is intended to provide a high-level
explanation of the steps necessary to design a single-phase
power converter. It is assumed that the reader is familiar with
many of the basic skills and techniques referenced in the
following section. In addition to this guide, Intersil provides
complete reference designs that include schematics, bills of
materials, and example board layouts.
s ? R TOP ? C INT ? ( 1 + s ? R FB ? C
1 + s ? ( R TOP + R FB ) ? C FB
)
G COMP ( s ) = -------------------------------------------------------------------------------------------
FB
(EQ. 15)
Selecting the LC Output Filter
The duty cycle of an ideal buck converter is a function of the
input and the output voltage. This relationship is written as
Equation 16:
V O
C INT = 100pF
R FB
C FB
D = ---------
V IN
(EQ. 16)
-
FB
R TOP
VO
The output inductor peak-to-peak ripple current is written as
Equation 17:
I PP = ------------------------------
COMP
EA
+
R BOTTOM
V O ? ( 1 – D )
f SW ? L
(EQ. 17)
REF
ISL62391, ISL62392
FIGURE 27. COMPENSATION REFERENCE CIRCUIT
The LC output filter has a double pole at its resonant frequency
that causes rapid phase change. The R 3 modulator used in the
A typical step-down DC/DC converter will have an I P-P of
20% to 40% of the maximum DC output load current. The
value of I P-P is selected based upon several criteria, such as
MOSFET switching loss, inductor core loss, and the resistive
loss of the inductor winding. The DC copper loss of the
inductor can be estimated by Equation 18:
ISL62391, ISL62392, ISL62391C and ISL62392C make the LC
output filter resemble a first order system in which the closed
P COPPER = I LOAD
2
?
DCR
(EQ. 18)
Δ V ESR = I P-P ? E SR
loop stability can be achieved with the recommended Type-II
compensation network. Intersil provides a PC-based tool
(example page is shown later) that can be used to calculate
compensation network component values and help simulate
the loop frequency response.
3.3V Linear Regulator
In addition to the two SMPS outputs, the ISL62391, ISL62392,
ISL62391C and ISL62392C also provide a fixed 3.3V LDO
output (LDO3) capable of sourcing 100mA continuous current.
LDO3 draws its power from PVCC and can be independently
enabled from both SMPS channels.
LDO3 also has a current limit feature with a nominal level of
180mA. Currents in excess of the limit will cause the LDO3
voltage to drop dramatically, limiting the power dissipation.
Thermal Monitor and Protection
Where I LOAD is the converter output DC current.
The copper loss can be significant so attention has to be
given to the DCR selection. Another factor to consider when
choosing the inductor is its saturation characteristics at
elevated temperature. A saturated inductor could cause
destruction of circuit components, as well as nuisance OCP
faults.
A DC/DC buck regulator must have output capacitance C O
into which ripple current I P-P can flow. Current I P-P develops a
corresponding ripple voltage V P-P across C O, which is the
sum of the voltage drop across the capacitor ESR and of the
voltage change stemming from charge moved in and out of
the capacitor. These two voltages are written as Equation 19:
(EQ. 19)
and Equation 20:
Δ V C = -----------------------------
LDO3 and PVCC LDOs can dissipate non-trivial power inside
the ISL62391, ISL62392, ISL62391C and ISL62392C at high
I P-P
8 ? C O ? f SW
(EQ. 20)
input-to-output voltage ratios and full load conditions. To protect
the silicon, ISL62391, ISL62392, ISL62391C and ISL62392C
continually monitor the die temperature. If the temperature
17
If the output of the converter has to support a load with high
pulsating current, several capacitors will need to be paralleled
to reduce the total ESR until the required V P-P is achieved.
FN6666.7
August 22, 2013
相关PDF资料 |
PDF描述 |
|---|---|
| B32620A4103J | CAP FILM 10000PF 400VDC RADIAL |
| UB26NKW015C-JC | SWITCH PUSHBUTTON DPDT 5A 125V |
| ISL62391CHRTZ | IC PWR SUPPLY CTRLR 28TQFN |
| UB26NBKW015C-CC | SWITCH PUSHBUTTON DPDT 5A 125V |
| B32021A3152M | CAP FILM 1500PF 1.5KVDC RADIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL62392CHRTZ-T | 功能描述:IC PWR SUPPLY CTRLR 28TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ISL62392CIRTZ | 功能描述:IC PWR SUPPLY CTRLR 28TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ISL62392CIRTZ-T | 功能描述:IC PWR SUPPLY CTRLR 28TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ISL62392HIEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL62392HI RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:Robust Ripple Regulator™ (R³) 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 |
| ISL62392HRTZ | 功能描述:IC PWR SUPPLY CONTROLLER 28TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。