参数资料
| 型号： | ISL6567CRZ |
| 厂商： | Intersil |
| 文件页数： | 16/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QFN |
| 标准包装： | 75 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66% |
| 电源电压： | 4.9 V ~ 5.5 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： | 0°C ~ 70°C |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1243 (CN2011-ZH PDF) |
ISL6567
ISL6567
EXTERNAL CIRCUIT
+5V
ISL6567
EXTERNAL CIRCUIT
PVCC
POR
CIRCUIT
VCC
V IN
POR
CIRCUIT
VCC
R BIAS
V IN
V REF
(0.61V)
R S
+
E/A
-
EN
COMP
-
EN
R P
Q1
OFF
ON
+
VREF
VREG
I H
(20μA)
VCC
SHUNT REG
FIGURE 16. START-UP COORDINATION USING THE EN PIN
A secondary disablement feature is available via the threshold-
sensitive enable input, the EN. This optional feature prevents
the ISL6567 from operating until a certain chosen voltage rail
is available and above some selectable threshold. One
example would be the input voltage: it may be desirable the
ISL6567-based converter does not start up until the input
voltage is sufficiently high. The schematic in Figure 16
demonstrates coordination of the ISL6567 start-up with such a
rail. The internal current source, I H , provides the means to a
user-adjustable hysteresis. The resistor value selection process
follows the same equations as those presented in “External
Additionally, an open-drain or open-collector device (Q1) can
be used to wire-AND a second (or multiple) control signal. To
defeat the threshold-sensitive enable, connect EN to VCC
directly or via a pull-up resistor.
In summary, for the ISL6567 to operate, VCC and PVCC must
be greater than their respective POR thresholds and the
voltage at EN must be greater than the comparator’s reference
FIGURE 17. INTERNAL SHUNT REGULATOR USE WITH EXTERNAL
RESISTOR (PASSIVE CONFIGURATION)
BIAS SUPPLY CONSIDERATIONS
The ISL6567 features an on-board shunt regulator capable of
sinking up to 100mA (minimally). This integrated regulator can
be used to produce the necessary bias voltage for the controller
and the MOSFETs. The integrated regulator can be utilized
directly, via a properly sized resistor, as shown in Figure 17, or
via an external NPN transistor and additional resistors when
either the current needed or the power being dissipated
becomes too large to be handled inside the ISL6567 in the
given operating environment.
A first step in determining the feasibility and selecting the
proper bias regulator configuration consists in determining the
maximum bias current required by the circuit. While the bias
current required by the ISL6567 is listed in the “Electrical
Specifications” table starting on page 5, the bias current
required by the controlled MOSFETs needs be calculated.
Equation 10 helps determine this bias current function of the
sum of the gate charge of all the controlled MOSFETs at 5V
(see typical threshold in the ”Electrical Specifications” table
starting on page 5 ). Once these conditions are met, the
controller immediately initiates a soft-start sequence.
V GS , Q GTOTAL , and the switching frequency, F SW :
I B ? Q GTOTAL ? F SW
(EQ. 10)
General Application Design
Guide
This design guide is intended to provide a high-level explanation
of the steps necessary to create a multi-phase power converter.
It is assumed that the reader is familiar with many of the basic
skills and techniques referenced in the following. In addition to
this guide, Intersil provides complete reference designs that
include schematics, bills of materials, and example board
layouts for typical applications.
16
I BIAS = I VCC + I B
Total required bias current, I BIAS , sums up the ISL6567’s bias
current, I VCC , to that required by the MOSFETs, I B .
FN9243.4
August 9, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6567CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-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) |
| ISL6567IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 24-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) |
| ISL6567IRZS2698 | 功能描述:IC REG CTRLR BUCK PWM VM 24-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) |
| ISL6567IRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-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) |
| ISL6567IRZ-TS2698 | 功能描述:IC REG CTRLR BUCK PWM VM 24-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) |
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