参数资料
| 型号： | ISL6567CRZ |
| 厂商： | Intersil |
| 文件页数： | 12/25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
SETTING THE OUTPUT VOLTAGE
OUTPUT CURRENT
EN
The ISL6567 uses a precision internal reference voltage to set
the output voltage. Based on this internal reference, the output
voltage can thus be set from 0.6V up to a level determined by
GND>
SS
the input voltage, the maximum duty cycle, and the conversion
efficiency of the circuit; Equation 7 estimates this maximum
amplitude the output voltage can be regulated to. Obviously,
insure that the input voltage and all the voltages sampled by
the ISL6567 do not exceed the controller’s absolute maximum
limits, or any other limits specified in this document.
ISL6567
EXTERNAL CIRCUIT
GND>
OUTPUT VOLTAGE
V REF
+
FIGURE 6. OVERCURRENT BEHAVIOR WHILE IN INTERNAL
REFERENCE MODE
As a result of an OC event, output drives turn off both upper
and lower MOSFETs, and the SS capacitor is discharged via a
20μA current source. The behavior following this standard
response varies depending whether the controller is operating
ERROR
AMPLIFIER
-
FB
VDIFF
VSEN
R 1
R S
+
in internal (using internal reference; MON > 3.5V) or external
reference mode (using external reference; MON < 3.5V). As
shown in Figure 6, the soft-start capacitor discharge prompted
by the OC event is followed by two SS cycles, during which the
X1
DIFFERENTIAL
AMPLIFIER
+
-
RGND
R P
To V OUT
-
ISL6567 stays off. Following the dormant SS cycles, the
controller attempts to re-establish the output. Should the OC
condition been removed, the output voltage is ramped up and
operation resumes as normal. Should the OC condition still be
present and result in another OC event, the entire behavior
FIGURE 8. SETTING THE OUTPUT VOLTAGE AT THE INPUT OF
THE DIFFERENTIAL AMPLIFIER
repeats until the OC condition is removed or the IC is disabled.
Figure 7 details the OC behavior while in external reference
mode. Following the OC event, the output drives are turned off,
V OUTMAX = d MAX ? V IN ? Efficiency
(EQ. 7)
the ISL6567 latches off, and the SS capacitor is discharged to
ground. Resetting the OC latch involves removal of bias power
or cycling of the EN pin (pictured in Figure 7). Should the OC
event been removed, the controller initiates a new SS cycle
and restores the output voltage.
The output voltage can be set via a simple resistor divider, as
shown in Figure 8. It is recommended this resistor divider is
connected at the input of the differential amplifier (as this
amplifier is powered from the IC’s 5V bias and has limited
input range). To avoid degradation of DC regulation tolerance
GND>
OUTPUT CURRENT
EN
due to the differential amplifier’s input resistance, a size
requirement is placed on the combined value of R P and R S .
Consider R to be the parallel combination of these two
resistors, and use a value of 2k Ω or less for R; use the
following equations to determine the value of R P and R S ,
based on the desired output voltage, the reference voltage,
and the chosen value of R.
R P = R ? --------------------------------
R S = R ? -------------
SS
V OUT
V OUT – V REF
V OUT
V REF
(EQ. 8)
GND>
OUTPUT VOLTAGE
FIGURE 7. OVERCURRENT BEHAVIOR WHILE IN EXTERNAL
REFERENCE MODE
12
FN9243.4
August 9, 2011
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相关代理商/技术参数 |
参数描述 |
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| 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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