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參數(shù)資料
| 型號： | ISL6741 |
| 廠商： | Intersil Corporation |
| 英文描述： | Flexible Double-Ended Voltage and Current Mode PWM Controllers |
| 中文描述： | 靈活的雙端電壓和電流模式PWM控制器 |
| 文件頁數(shù)： | 9/21頁 |
| 文件大?。?/td> | 507K |
| 代理商： | ISL6741 |
9
The ISL6740, ISL6741 features a built-in soft start. Soft start
is implemented as a clamp on the error voltage input.
OTS -
The non-inverting input to the over temperature
shutdown comparator. The signal input at this pin is
compared to an internal threshold of V
REF
/2. If the voltage at
this pin exceeds the threshold, the Fault signal is asserted
and the outputs are disabled until the condition clears. There
is a nominal 25
μ
A switched current source used for
hysteresis. The amount of hysteresis is adjustable by
varying the source impedance of the signal into this pin.
FAULT -
The Fault signal is asserted high whenever the
outputs, OUTA and OUTB, are disabled. This occurs during
an over temperature fault, an input UV fault, a V
REF
UV
fault, or during an over current (ISL6740) or short circuit
shutdown fault.
UV -
Undervoltage monitor input pin. A resistor divider
between the input source voltage and GND sets the under
voltage lock out threshold. The signal is compared to an
internal 1.00V reference to detect an under voltage or inhibit
condition.
CS -
This is the input to the current sense comparator(s).
The IC has the PWM comparator for peak current mode
control (ISL6741) and an over current protection
comparator. The over current comparator threshold is set at
0.600V nominal. A short circuit condition occurs when the
threshold set by the SCSET pin is exceeded. The CS pin is
shorted to GND at the end of each switching cycle.
Depending on the the current sensing source impedance, a
series input resistor may be required due to the delay
between the internal clock and the external power switch.
This delay may allow the CS input
ISL6740
- Exceeding the over-current threshold will start a
delayed shutdown sequence. Once an over current
condition is detected, the soft start charge current source is
disabled. The soft start capacitor begins discharging through
a 25
μ
A current source, and if it discharges to less than
4.25V (Sustained Over Current Threshold), a shutdown
condition occurs and the OUTA and OUTB outputs are
forced low. When the soft start voltage reaches 0.27V
(Reset Threshold) a soft start cycle begins.
If the over current condition ceases, and then an additional
50
μ
S period elapses before the shutdown threshold is
reached, no shutdown occurs. The SS charging current is
re-enabled and the soft start voltage is allowed to recover.
ISL6741
- The ISL6741 current mode controller does not
shutdown due to an overcurrent condition. The pulse-by-
pulse current limit characteristic of peak current mode
control limits the output current to acceptable levels.
GND -
Reference and power ground for all functions on this
device. Due to high peak currents and high frequency
operation, a low impedance layout is necessary. Ground
planes and short traces are highly recommended.
OUTA and OUT B -
Alternate half cycle output stages. Each
output is capable of 0.5A peak currents for driving logic level
power MOSFETs or MOSFET drivers. Each output provides
very low impedance to overshoot and undershoot.
VREF -
The 5.00V reference voltage output. 1% tolerance
over line, load and operating temperature. Bypass to GND
with a 0.01
μ
F or larger ceramic capacitor.
SS -
Connect the soft start timing capacitor between this pin
and GND to control the duration of soft start. The value of
the capacitor determines the rate of increase of the duty
cycle during start up, controls the over current shutdown
delay (ISL6740), and the over current and short circuit hic-
cup restart period.
SCSET -
Sets the duty cycle threshold that corresponds to a
short circuit condition. A resistive divider between R
TC
and
GND or R
TD
and GND may be used to adjust the SCSET
threshold. In either case, the impedance to GND from either
R
TC
or R
TD
affects the oscillator timing and should be
considered when determining the oscillator timing
components. Connecting SCSET to GND disables short
circuit shutdown and hic-cup.
Functional Description
Features
The ISL6740, ISL6741 PWMs are an excellent choice for
low cost bridge and push-pull topologies for applications
requiring accurate duty cycle and deadtime control. With its
many protection and control features, a highly flexible design
with minimal external components is possible. Among its
many features are current mode control (ISL6741),
adjustable soft start, over current protection, thermal
protection, bi-directional synchronization, fault indication,
and adjustable frequency.
Oscillator
The ISL6740, ISL6741 have an oscillator with a
programmable frequency range to 2MHz, which can be
programmed with two resistors and capacitor. The use of
three timing elements, R
TC
, R
TD
, and C
T
allow great
flexibility and precision when setting the oscillator frequency.
The switching period may be considered the sum of the
timing capacitor charge and discharge durations. The
charge duration is determined by R
TC
and C
T
. The
discharge duration is determined by R
TD
and C
T
.
T
C
0.5
R
TC
C
T
≈
S
(EQ. 2)
T
D
0.02
R
TD
C
T
≈
S
(EQ. 3)
T
SW
T
C
T
D
+
SW
------------
=
=
S
(EQ. 4)
ISL6740, ISL6741
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6741IB | 功能描述:電流型 PWM 控制器 CUR PWM MODE CNTRLR 16LD N RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6741IB-T | 功能描述:IC REG CTRLR PWM CM 16-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(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| ISL6741IBZ | 功能描述:IC REG CTRLR PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6741IBZ-T | 功能描述:IC REG CTRLR PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6741IV | 功能描述:IC REG CTRLR PWM CM 16-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
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