Datasheet > ISL6520AIRZ

ISL6520AIRZ

更新时间： 2024-02-03 09:30:37

品牌	Logo	应用领域
瑞萨 - RENESAS		开关
页数	文件大小	规格书
12页	662K
描述
SWITCHING CONTROLLER, 340kHz SWITCHING FREQ-MAX, PQCC16, 4 X 4 MM, LEAD FREE, PLASTIC, MO-220-VGGC, QFN-16

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ISL6520AIRZ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	HVQCCN, LCC16,.16SQ,25	针数：	16
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.55
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER	控制模式：	VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	5.5 V
最小输入电压：	4.5 V	标称输入电压：	5 V
JESD-30 代码：	S-PQCC-N16	JESD-609代码：	e3
长度：	4 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	16
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	HVQCCN
封装等效代码：	LCC16,.16SQ,25	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1 mm
子类别：	Switching Regulator or Controllers	表面贴装：	YES
切换器配置：	PUSH-PULL	最大切换频率：	340 kHz
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	NO LEAD	端子节距：	0.65 mm
端子位置：	QUAD	处于峰值回流温度下的最长时间：	30
宽度：	4 mm	Base Number Matches：	1

ISL6520AIRZ 数据手册

ISL6520A

controlled output voltage rise. The entire startup sequence

typically take about 11ms.

OUTPUT INDUCTOR

CURRENT

5A/DIV.

OUT

500mV/DIV.

COMP/OCSET

1V/DIV.

TIME (5ms/DIV.)

FIGURE 1. OVERCURRENT OPERATION

The overcurrent function will trip at a peak inductor current

TIME (2ms/DIV.)

determined by Equation 3:

PEAK)

FIGURE 2. SOFT-START INTERVAL

x R

OCSET

= ----------------------------------------------------

PEAK

DSON

(EQ. 3)

Current Sinking

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.

where I

is the internal OCSET current source (20µA

OCSET

typical). The OC trip point varies mainly due to the

MOSFET’s r variations. To avoid overcurrent tripping

DS(ON)

in the normal operating load range, find the R

from the equation above with:

resistor

OCSET

When the converter is sinking current, it is behaving as a

boost converter that is regulating it’s input voltage. This

1. The maximum r

temperature.

at the highest junction

DS(ON)

means that the converter is boosting current into the V

rail, which supplies the bias voltage to the ISL6520A. If there

is nowhere for this current to go, such as to other distributed

2. The minimum I

3. Determine I

from the specification table.

OCSET

I

> I

+ ----------

OUTMAX

for

PEAK

whereI is the output inductor ripple current.

loads on the V

rail, through a voltage limiting protection

device, or other methods, the capacitance on the V

For an equation for the ripple current see the section under

component guidelines titled “Output Inductor Selection” on

page 8.

bus

will absorb the current. This situation will allow voltage level

of the V 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.

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

Application Guidelines

Layout Considerations

COMP/OCSET is used to sample the overcurrent setpoint by

disabling the error amplifier and drawing 20µA through

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.

. Once the overcurrent level has been sampled, the

OCSET

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

FN9016 Rev 6.00

Dec 10, 2009

Page 6 of 12

1...3 4 567 8 9...12

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