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| 型号： | ISL6520ACB-T |
| 厂商： | Intersil |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 340kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | ISL6520ACB-DKR ISL6520ACB-DKR-ND ISL6520ACBDKR |
ISL6520A
controlled output voltage rise. The entire startup sequence
typically take about 11ms.
OUTPUT INDUCTOR
CURRENT
5A/DIV.
V OUT
500mV/DIV.
COMP/OCSET
1V/DIV.
TIME (5ms/DIV.)
FIGURE 1. OVERCURRENT OPERATION
The overcurrent function will trip at a peak inductor current
(I PEAK) determined by Equation 3:
TIME (2ms/DIV.)
FIGURE 2. SOFT-START INTERVAL
r DS ( ON )
I OCSET x R OCSET
I PEAK = -----------------------------------------------------
(EQ. 3)
Current Sinking
3. Determine I PEAK for I PEAK > I OUT ( MAX ) + ---------- ,
where Δ I is the output inductor ripple current.
where I OCSET is the internal OCSET current source (20μA
typical). The OC trip point varies mainly due to the
MOSFET’s r DS(ON) variations. To avoid overcurrent tripping
in the normal operating load range, find the R OCSET resistor
from the equation above with:
1. The maximum r DS(ON) at the highest junction
temperature.
2. The minimum I OCSET from the specification table.
( Δ I )
2
For an equation for the ripple current see the section under
Soft-Start
The POR function initiates the soft-start sequence after the
overcurrent set point has been sampled. Soft-start clamps the
error amplifier output (COMP pin) and reference input
(non-inverting terminal of the error amp) to the internally
generated soft-start voltage. Figure 2 shows a typical start-up
interval where the COMP/OCSET pin has been released from
a grounded (system shutdown) state. Initially, the
COMP/OCSET is used to sample the overcurrent setpoint by
disabling the error amplifier and drawing 20μA through
R OCSET . Once the overcurrent level has been sampled, the
soft-start function is initiated. The clamp on the error amplifier
(COMP/OCSET pin) initially controls the converter’s output
voltage during soft-start. The oscillator’s triangular waveform is
compared to the ramping error amplifier voltage. This
generates PHASE pulses of increasing width that charge the
output capacitor(s). When the internally generated soft-start
voltage exceeds the feedback (FB pin) voltage, the output
voltage is in regulation. This method provides a rapid and
6
The ISL6520A incorporates a MOSFET shoot-through
protection method which allows a converter to sink current
as well as source current. Care should be exercised when
designing a converter with the ISL6520A when it is known
that the converter may sink current.
When the converter is sinking current, it is behaving as a
boost converter that is regulating it’s input voltage. This
means that the converter is boosting current into the V CC
rail, which supplies the bias voltage to the ISL6520A. If there
is nowhere for this current to go, such as to other distributed
loads on the V CC rail, through a voltage limiting protection
device, or other methods, the capacitance on the V CC bus
will absorb the current. This situation will allow voltage level
of the V CC rail to increase. If the voltage level of the rail is
boosted to a level that exceeds the maximum voltage rating
of the ISL6520A, then the IC will experience an irreversible
failure and the converter will no longer be operational.
Ensuring that there is a path for the current to follow other
than the capacitance on the rail will prevent this failure
mode.
Application Guidelines
Layout Considerations
As in any high frequency switching converter, layout is very
important. Switching current from one power device to another
can generate voltage transients across the impedances of the
interconnecting bond wires and circuit traces. These
interconnecting impedances should be minimized by using
wide, short printed circuit traces. The critical components
should be located as close together as possible, using ground
plane construction or single point grounding.
FN9016.6
December 10, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6520ACBZ | 功能描述:电压模式 PWM 控制器 VER OF ISL6520ACB RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6520ACBZA | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC 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) |
| ISL6520ACBZA-T | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC 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) |
| ISL6520ACBZA-TS2490 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6520ACBZ-T | 功能描述:电压模式 PWM 控制器 VER OF ISL6520ACB-T RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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