参数资料
| 型号： | ISL6567CRZ |
| 厂商： | Intersil |
| 文件页数： | 13/25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
minimal impact on the output voltage setting, follow the
V REF
ISL6567
EXTERNAL CIRCUIT
guidelines presented in “Setting the Output Voltage” on
ERROR
AMPLIFIER
+
-
FB
R S (R 1 )
R P
+
To V OUT
EXTERNAL REFERENCE OPERATION
The ISL6567 is capable of accepting an external voltage and
using it as a reference for its output regulation. To enable this
mode of operation, the MON pin potential has to be below 3.5V
and the reference voltage has to be connected to the REFTRK
VDIFF
pin. The internal or external reference mode of operation is
latched in every time the POR is released or the ISL6567 is
enabled. The highest magnitude external reference fed to the
REFTRK pin that the ISL6567 can follow is limited to 2.3V. The
X1
DIFFERENTIAL
AMPLIFIER
+
-
VSEN
RGND
ISL6567 utilizes a small initial negative offset (typically about
50mV) in the voltage loop at the beginning of it soft-start, to
counteract any positive offsets that may have undesirable
effects. As this initial offset is phased out as the reference is
ramped up to around 200mV, in order to avoid an error in the
FIGURE 9. SETTING THE OUTPUT VOLTAGE AT THE FB PIN
output regulation level, it is recommended the external
reference has an amplitude (final, DC level) exceeding 300mV.
The differential amplifier can be used even if remote output
sensing is not desired or not feasible, simply connect RGND to
the local ground and connect VSEN to the output voltage being
monitored. Should one desire to bypass the differential
VCC
I H
(10μA)
ISL6567
EXTERNAL CIRCUIT
VDIFF
amplifier, the circuit in Figure 9 is recommended as the proper
-
implementation. Since its output is monitored for OVP and
PGOOD purposes, the differential amplifier needs to be
connected to the feedback circuit at all times, hence its input
connections to FB and local ground. However, its output, VDIFF,
can be left open. The resistor divider setting the output voltage
is calculated in a manner identical to that already revealed.
ISL6567
EXTERNAL
+
MON
COMPARATOR
V REF
(300mV)
+
-
MON
R P
R S
CIRCUIT
FIGURE 11. SETTING THE MONITORING THRESHOLD AND
VDIFF
HYSTERESIS
DIFFERENTIAL
AMPLIFIER
-
+
Z IN
~2μA
VSEN
RGND
While in external reference (ER) mode, the threshold sensitive
MON pin can be used to control when the ISL6567 starts to
monitor the output for PGOOD and OVP protection purposes.
As shown in Figure 11, connect the MON pin to the voltage to
be monitored via a resistor divider. An internal current source
helps set a user-adjustable monitor threshold hysteresis.
Choose resistor values according to desired hysteresis voltage,
I H
V T – V REF
Z IN > 240k Ω
OVER PROCESS, TEMPERATURE, AND
0 < VSEN-RGND < 2.5V
FIGURE 10. SETTING THE OUTPUT VOLTAGE AT THE INPUT OF
THE DIFFERENTIAL AMPLIFIER
DIFFERENTIAL AMPLIFIER’S UNITY GAIN NETWORK
The differential amplifier on the ISL6567 utilizes a typical
resistive network along with active compensating circuitry to
set its unity gain. This resistive network can affect the DC
regulation setpoint in proportion to its relative magnitude
compared to the external output voltage setting resistor
divider. Figure 10 details the internal resistive network. For
13
V H , and desired rising threshold, V T . Make note that, in these
equations, V REF refers to the reference of the MON comparator
(300mV).
V H R S ? V REF (EQ. 9)
R S = ------ R P = -------------------------
Intersil recommends the MON threshold is set to be tripped
when the external reference voltage reaches at least 90% of
the final DC value. Since PGOOD and OVP monitoring are
relative to the external reference magnitude, it is important to
understand that the PGOOD and OVP thresholds will move in
proportion to the moving reference (externally soft-started
reference). Thus, the absolute thresholds of PGOOD and OVP.
FN9243.4
August 9, 2011
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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) |
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| 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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