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參數資料
| 型號： | ISL6431CB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple 3-Input Positive-NAND Gates 14-TSSOP -40 to 85 |
| 中文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 4/10頁 |
| 文件大?。?/td> | 187K |
| 代理商： | ISL6431CB |
4
Functional Pin Descriptions
VCC (Pin 5)
This is the main bias supply for the ISL6431, as well as the
lower MOSFET’s gate. Connect a well-decoupled 5V supply
to this pin.
FB (Pin 6)
This pin is the inverting input of the internal error amplifier.
Use this pin, in combination with the COMP/OCSET pin, to
compensate the voltage-control feedback loop of the
converter.
GND (Pin 3)
This pin represents the signal and power ground for the IC.
Tie this pin to the ground island/plane through the lowest
impedance connection available.
PHASE (Pin 8)
Connect this pin to the upper MOSFET source. This pin is
used to monitor the voltage drop across the upper MOSFET
for overcurrent protection. This pin is also monitored by the
continuously adaptive shoot-through protection circuitry to
determine when the upper MOSFET has turned off.
UGATE (Pin 2)
Connect this pin to the upper MOSFET’s gate. This pin
provides the PWM-controlled gate drive for the upper
MOSFET. This pin is also monitored by the adaptive shoot-
through protection circuitry to determine when the upper
MOSFET has turned off. Do not insert any circuitry between
this pin and the gate of the upper MOSFET, as it may
interfere with the internal adaptive shoot-through protection
circuitry and render it ineffective.
BOOT (Pin 1)
This pin provides ground referenced bias voltage to the
upper MOSFET driver. A bootstrap circuit is used to create a
voltage suitable to drive a logic-level N-channel MOSFET.
COMP/OCSET (Pin 7)
This is a multiplexed pin. During a short period of time
following power-on reset (POR), this pin is used to determine
the overcurrent threshold of the converter. Connect a
resistor (R
OCSET
) from this pin to the drain of the upper
MOSFET (V
CC
). R
OCSET
, an internal 20
μ
A current source
(I
OCSET
), and the upper MOSFET on-resistance (r
DS(ON)
)
set the converter overcurrent (OC) trip point according to the
following equation:
Internal circuitry of the ISL6431 will not recognize a voltage
drop across R
OCSET
larger than 0.5V. Any voltage drop
across R
OCSET
that is greater than 0.5V will set the
overcurrent trip point to:
An overcurrent trip cycles the soft-start function.
Pulling OCSET to a level below 0.8V will disable the
controller. Disabling the ISL6431 causes the oscillator to
stop, the LGATE and UGATE outputs to be held low, and the
softstart circuitry to re-arm.
During soft-start, and all the time during normal converter
operation, this pin represents the output of the error
amplifier. Use this pin, in combination with the FB pin, to
compensate the voltage-control feedback loop of the
converter.
LGATE (Pin 4)
Connect this pin to the lower MOSFET’s gate. This pin
provides the PWM-controlled gate drive for the lower
MOSFET. This pin is also monitored by the adaptive shoot-
through protection circuitry to determine when the lower
MOSFET has turned off. Do not insert any circuitry between
this pin and the gate of the lower MOSFET, as it may
interfere with the internal adaptive shoot-through protection
circuitry and render it ineffective.
Functional Descriptions
Initialization
The ISL6431 automatically initializes upon receipt of power.
The Power-On Reset (POR) function continually monitors the
bias voltage at the VCC pin. The POR function initiates the
Overcurrent Protection (OCP) sampling and hold operation
after the supply voltage exceeds its POR threshold. Upon
Lower Gate Sink Current
I
LGATE-SNK
ISL6431CB
-
2.0
-
A
ISL6431IB
-
2.0
-
A
PROTECTION / DISABLE
OCSET Current Source
I
OCSET
ISL6431CB
17
20
22
μ
A
μ
A
ISL6431IB
14
20
24
Disable Threshold
V
DISABLE
ISL6431CB
-
-
0.8
V
ISL6431IB
-
-
0.8
V
Electrical Specifications
Recommended Operating Conditions, Unless Otherwise Noted V
CC
= 5.0V
±
5% and T
A
= 25
o
C
(Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
I
PEAK
I
xR
DS ON
)
-------------------------------------------------
=
I
PEAK
DS ON
)
----------------------
=
ISL6431
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ISL6431CB-T | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6431IB | 制造商:Intersil Corporation 功能描述: |
| ISL6432CB | 制造商:Intersil Corporation 功能描述: |
| ISL6432CB-T | 功能描述:IC REG QD BCK/LINEAR 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數:5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| ISL6433BCB | 制造商:Intersil Corporation 功能描述: |
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