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参数资料
| 型号： | ISL6527ACRZ-T |
| 厂商： | Intersil |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 16-QFN |
| 标准包装： | 6,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 645kHz |
| 占空比： | 100% |
| 电源电压： | 2.97 V ~ 3.63 V |
| 降压： | 是 |
| 升压： | 是 |
| 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： | 16-VQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL6527, ISL6527A
Electrical Specifications
Recommended Operating Conditions, unless otherwise noted V CC = 3.3V ±5% and T A = +25°C (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PROTECTION/DISABLE
OCSET Current Source
Disable Threshold
I OCSET
V OCSET/SD
Commercial
Industrial
18
16
-
20
20
-
22
22
0.8
μA
μA
V
NOTE:
4. Limits should be considered typical and are not production tested.
Functional Description
.
Initialization
The ISL6527, ISL6527A automatically initialize upon receipt of
power. Special sequencing of the input supplies is not
necessary. The Power-On Reset (POR) function continually
monitors the the output voltage of the Charge Pump. During
POR, the Charge Pump operates on a free running oscillator.
Once the POR level is reached, the Charge Pump oscillator is
synched to the PWM oscillator. The POR function also initiates
the soft-start operation after the Charge Pump Output Voltage
exceeds its POR threshold.
0V
(1V/DIV)
CPVOUT (5V)
VCC (3.3V)
VOUT (2.50V)
Soft-Start
t0
t2
t3
The POR function initiates the digital soft-start sequence. The
PWM error amplifier reference is clamped to a level
proportional to the soft-start voltage. As the soft-start voltage
slews up, the PWM comparator generates PHASE pulses of
increasing width that charge the output capacitor(s). This
method provides a rapid and controlled output voltage rise. The
soft-start sequence typically takes about 6.5ms when V REF_IN
is 1.5V
If V REF_IN is less that 1.5V, the soft-start rise time will be
proportionally smaller as shown in Equation 2:
t1 TIME
FIGURE 1. SOFT-START INTERVAL
Shoot-Through Protection
A shoot-through condition occurs when both the upper
MOSFET and lower MOSFET are turned on simultaneously,
effectively shorting the input voltage to ground. To protect the
regulator from a shoot-through condition, the ISL6527,
ISL6527A incorporate specialized circuitry, which insures that
the complementary MOSFETs are not ON simultaneously.
The adaptive shoot-through protection utilized by the
RiseTime = t SS × ---------------------
V REFIN
1.5V
(EQ. 2)
ISL6527, ISL6527A looks at the lower gate drive pin, LGATE,
and the upper gate drive pin, UGATE, to determine whether a
MOSFET is ON or OFF. If the voltage from UGATE or from
Figure 1 shows the soft-start sequence for a typical
application. At T0, the +3.3V VCC voltage starts to ramp. At
time t1, the Charge Pump begins operation and the +5V
CPVOUT IC bias voltage starts to ramp up. Once the voltage
on CPVOUT crosses the POR threshold at time t2, the output
begins the soft-start sequence. The triangle waveform from
the PWM oscillator is compared to the rising error amplifier
output voltage. As the error amplifier voltage increases, the
pulse-width on the UGATE pin increases to reach the
steady-state duty cycle at time t3.
7
LGATE to GND is less than 0.8V, then the respective
MOSFET is defined as being OFF and the complementary
MOSFET is turned ON. This method of shoot-through
protection allows the regulator to sink or source current.
Since the voltage of the lower MOSFET gate and the upper
MOSFET gate are being measured to determine the state of
the MOSFET, the designer is encouraged to consider the
repercussions of introducing external components between
the gate drivers and their respective MOSFET gates before
actually implementing such measures. Doing so may interfere
with the shoot-through protection.
FN9056.10
November 18, 2008
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相关代理商/技术参数 |
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|---|---|
| ISL6527AEVAL1 | 功能描述:EVALUATION BOARD SOIC ISL6527A RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL6527AEVAL2 | 功能描述:EVALUATION BOARD QFN ISL6527A RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6527AIB | 功能描述:IC REG CTRLR BST PWM VM 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6527AIB-T | 功能描述:IC REG CTRLR BST PWM VM 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6527AIBZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
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