参数资料
| 型号： | ISL6540AIRZA-T |
| 厂商： | Intersil |
| 文件页数： | 15/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28-QFN |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 占空比： | 100% |
| 电源电压： | 2.97 V ~ 22 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： | -40°C ~ 85°C |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 产品目录页面： | 1243 (CN2011-ZH PDF) |
| 其它名称： | ISL6540AIRZA-TDKR |
ISL6540A
VSENSE-
(REMOTE)
VSENSE+
(REMOTE)
VOUT (LOCAL)
10 Ω
GND (LOCAL)
10 Ω
R OS
R FB
C SEN
Z IN
Z FB
VCC
VSEN-
VSEN+
VMON
FB
COMP
1.8V
OV/UV
COMP
ERROR AMP
GAIN=1
V SS
FIGURE 6. SIMPLIFIED UNITY GAIN DIFFERENITAL SENSING IMPLEMENTATION
Internal Reference and System Accuracy
The internal reference is trimmed to 0.591V. The total DC
system accuracy of the system is within ±0.68% over
commercial temperature range, and ±1.00% over industrial
temperature range. System accuracy includes error amplifier
offset, OTA error, and bandgap error. Differential remote
sense offset error is not included. As a result, if the
differential remote sense is used, then an extra 1.9mV of
offset error enters the system. The use of REFIN may add
up to 2.2mV of additional offset error.
Differential Remote Sense Buffer
The differential remote sense buffer is essentially an
instrumentation amplifier with unity gain. The offset is
trimmed to 1.5mV for high system accuracy. As with any
instrumentation amplifier, typically 6μA are sourced from the
VSEN- pin. The output of the remote sense buffer is
connected directly to the internal OV/UV comparator. As a
result, a resistor divider should be placed on the input of the
buffer for proper regulation, as shown in Figure 6. The
VMON pin should be connected to the FB pin by a standard
feed-back network. A small capacitor, C SEN in Figure 6, can
be added to filter out noise, typically C SEN is chosen so the
corresponding time constant does not reduce the overall
phase margin of the design, typically this is 2x to 10x
switching frequency of the regulator.
As some applications will not use the differential remote
sense, the output of the remote sense buffer can be disabled
(high impedance) by pulling VSEN- within 1.8V of VCC. As
the VMON pin is connected internally to the OV/UV/PGOOD
comparator, an external resistor divider must then be
connected to VMON to provide correct voltage information
for the OV/UV comparator. An RC filter should be used if
15
VMON is to be connected directly to FB instead of to VOUT
through a separate resistor divider network. This filter
prevents noise injection from disturbing the OV/UV/PGOOD
comparators on VMON. VMON may also be connected to
the SS pin, which completely bypasses the OV/UV/PGOOD
functionality.
Application Guidelines
Layout Considerations
MOSFETs switch very fast and efficiently. The speed with
which the current transitions from one device to another
causes voltage spikes across the interconnecting
impedances and parasitic circuit elements. These voltage
spikes can degrade efficiency, radiate noise into the circuit
and lead to device overvoltage stress. Careful component
layout and printed circuit design minimizes the voltage
spikes in the converter. Consider, as an example, the turnoff
transition of the upper PWM MOSFET. Prior to turnoff, the
upper MOSFET is carrying the output inductor current.
During the turnoff, current stops flowing in the upper
MOSFET and is picked up by the lower MOSFET. Any
inductance in the switched current path generates a large
voltage spike during the switching interval. Careful
component selection, tight layout of the critical components,
and short, wide circuit traces minimize the magnitude of
voltage spikes.
There are two sets of critical components in a DC/DC
converter using a ISL6540A controller. The power
components are the most critical because they switch large
currents and have the potential to create large voltage
spikes, as well as induce noise into sensitive, high
impedance adjacent nodes. Next are small signal
FN6288.5
October 7, 2008
相关PDF资料 |
PDF描述 |
|---|---|
| ISL65426HRZ | IC REG BUCK SYNC ADJ 6A DL 50QFN |
| ISL6545IBZ-T | IC REG CTRLR BUCK PWM VM 8-SOIC |
| ISL6548ACRZA-T | IC REG/CTLR ACPI DUAL DDR 28QFN |
| ISL6548CRZA | IC REG/CTRLR ACPI DUAL DDR 28QFN |
| ISL6551IR-T | IC REG CTRLR FLYBACK PWM 28-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6540AIRZR5359 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6540AIRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6540AIRZ-TR5359 | 制造商:Intersil Corporation 功能描述: |
| ISL6540AIRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6540AIRZ-T WITH GOLD BOND WIRE ONLY - Tape and Reel |
| ISL6540CRZ | 制造商:Intersil Corporation 功能描述:VOLT MODE PWM CNTRLR 0.6V TO 20V 30A 28QFN EP - Rail/Tube |
发布紧急采购，3分钟左右您将得到回复。