参数资料
| 型号： | ISL6565BCV-T |
| 厂商： | Intersil |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66.7% |
| 电源电压： | 4.75 V ~ 5.25 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 ~ 105°C |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
ISL6565A, ISL6565B
The ISL6565A, ISL6565B checks the VID inputs six times
every switching cycle. If the VID code is found to have
changed, the controller waits half of a complete cycle before
executing a 12.5mV change. If during the half-cycle wait
created by pushing the average sense current through a
selectable external resistor, R TCOMP .
VDIFF
period, the difference between the DAC level and the new
VID code changes sign, no change is made. If the VID code
is more than 1 bit higher or lower than the DAC (not
recommended), the controller will execute 12.5mV changes
six times per cycle until VID and DAC are equal. It is
-
V DROOP
+
R FB
FB
I AVG
important to carefully control the rate of VID stepping in 1-bit
increments.
In order to ensure the smooth transition of output voltage
during VID change, a VID step change smoothing network is
required for an ISL6565A, ISL6565B based voltage
regulator. This network is composed of a 1k ? internal
resistor between the output of DAC and the capacitor C REF ,
between the REF pin and ground. The selection of C REF is
based on the time duration for 1 bit VID change and the
allowable delay time.
I DROOP
TCOMP
R TCOMP
I TCOMP
K TC
I AVG
ISL6565A, ISL6565B
Assuming the microprocessor controls the VID change at 1
bit every T VID , the relationship between C REF and T VID is
given by Equation 15.
C REF = 0.004X T VID (EQ. 15)
As an example, for a VID step change rate of 5 μ s per bit, the
value of C REF is 22nF based on Equation 15.
FIGURE 10. TEMPERATURE COMPENSATION CIRCUITRY
As shown in Figure 10, the voltage drop developed across
R TCOMP is then sensed and multiplied by a known gain,
K TC , which is determined by the internal IC temperature.
This gain creates the temperature compensation current,
I TCOMP , that is injected into the FB pin.
Temperature Compensation
I TCOMP = K TC ? ( T – 25 ) ? I AVG ? R TCOMP
(EQ. 18)
MOSFET r DS(ON) and inductor DCR are both susceptible to
changes in value due to temperature. Since output voltage
positioning is derived from the channel current sensed
across these two elements, any variation in resistance
results in a corresponding error in the output voltage.
The temperature coefficient, α , of the r DS(ON) or DCR is the
parameter that determines how much the resistance varies
with temperature. As temperature increases above ambient,
the average sensed current, I AVG , changes in proportion to
the temperature coefficient and temperature rise as shown in
Equation 16.
Select R TCOMP such that I TCOMP equals I ERR over the
entire range of operating temperature. The resulting droop
current accurately represents the load current; achieving a
linear, temperature-independant load line.
Initialization
Prior to initialization, proper conditions must exist on the
enable inputs and VCC. When the conditions are met, the
controller begins soft-start. Once the output voltage is within
the proper window of operation, the controller asserts
PGOOD.
I AVG = I AVG ( T
AMBIENT
) ? [ 1 + α ( T – T AMBIENT ) ]
(EQ. 16)
Enable and Disable
While in shutdown mode, the PWM outputs are held in a
With this resulting error, I AVG can now be described as the
sum of two parts, the average sensed current at ambient
temperature and the resulting error current, I ERR , due to the
temperature rise.
high-impedance state to assure the drivers remain off. The
following input conditions must be met before the ISL6565A,
ISL6565B is released from shutdown mode.
1. The bias voltage applied at VCC must reach the internal
power-on reset (POR) rising threshold. Once this
I ERR ( T ) = I AVG ( T
AMBIENT
) ? α ? ( T – T AMBIENT )
(EQ. 17)
threshold is reached, proper operation of all aspects of
the ISL6565A, ISL6565B is guaranteed. Hysteresis
between the rising and falling thresholds assure that once
In order to compensate for this error current, the ISL6565A,
ISL6565B includes a temperature compensation circuit that
injects a current, I TCOMP , into the FB pin. This current is
16
enabled, the ISL6565A, ISL6565B will not inadvertently
turn off unless the bias voltage drops substantially (see
Electrical Specifications ).
FN9135.4
December 1, 2005
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| ISL6565BCVZ | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP 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) |
| ISL6565BCVZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP 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) |
| ISL6566ACRZ | 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6566ACRZ-T | 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6566AIRZ | 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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