- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383173 > ISL8841AABZ (INTERSIL CORP) High Performance Industry Standard Single-Ended Current Mode PWM Controller PDF資料下載
參數(shù)資料
| 型號(hào)： | ISL8841AABZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| 中文描述： | 1 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MO-012AA, SOIC-8 |
| 文件頁(yè)數(shù)： | 10/15頁(yè) |
| 文件大小： | 313K |
| 代理商： | ISL8841AABZ |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)當(dāng)前第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)
10
FN6320.3
April 18, 2007
Pin Descriptions
RTCT -
This is the oscillator timing control pin. The
operational frequency and maximum duty cycle are set by
connecting a resistor, RT, between VREF and this pin and a
timing capacitor, CT, from this pin to GND. The oscillator
produces a sawtooth waveform with a programmable
frequency range up to 2.0MHz. The charge time, t
C
, the
discharge time, t
D
, the switching frequency, f, and the
maximum duty cycle, Dmax, can be approximated from the
following equations:
The formulae have increased error at higher frequencies due
to propagation delays. Figure 4 may be used as a guideline
in selecting the capacitor and resistor values required for a
given frequency.
COMP -
COMP is the output of the error amplifier and the
input of the PWM comparator. The control loop frequency
compensation network is connected between the COMP and
FB pins.
FB -
The output voltage feedback is connected to the
inverting input of the error amplifier through this pin. The
non-inverting input of the error amplifier is internally tied to a
reference voltage.
CS -
This is the current sense input to the PWM comparator.
The range of the input signal is nominally 0V to 1.0V and has
an internal offset of 100mV.
GND -
GND is the power and small signal reference ground
for all functions.
OUT -
This is the drive output to the power switching device.
It is a high current output capable of driving the gate of a
power MOSFET with peak currents of
1.0A
. This GATE
output is actively held low when V
DD
is below the UVLO
threshold.
V
DD
-
V
DD
is the power connection for the device. The total
supply current will depend on the load applied to OUT. Total
I
DD
current is the sum of the operating current and the
average output current. Knowing the operating frequency, f,
and the MOSFET gate charge, Qg, the average output
current can be calculated from:
To optimize noise immunity, bypass V
DD
to GND with a
ceramic capacitor as close to the V
DD
and GND pins as
possible.
VREF -
The 5.00V reference voltage output. +1.0/-1.5%
tolerance over line, load and operating temperature. Bypass
to GND with a 0.1
μ
F to 3.3
μ
F capacitor to filter this output as
needed.
Functional Description
Features
The ISL884xA current mode PWM makes an ideal choice for
low-cost flyback and forward topology applications. With its
greatly improved performance over industry standard parts,
it is the obvious choice for new designs or existing designs
which require updating.
Oscillator
The ISL884xA has a sawtooth oscillator with a
programmable frequency range to 2MHz, which can be
programmed with a resistor from VREF and a capacitor to
GND on the RTCT pin. (Please refer to
Figure 4
for the
resistor and capacitance required for a given frequency.)
FIGURE 3. EA REFERENCE vs TEMPERATURE
FIGURE 4. RESISTANCE FOR CT CAPACITOR VALUES GIVEN
Typical Performance Curves
(Continued)
-60 -40
-20
0
TEMPERATURE (°C)
20
40
60
80
100 120 140
0.996
0.997
0.998
1.000
1.001
N
1
10
100
1
10
100
10
3
RT (k
Ω
)
F
100pF
220pF
330pF
470pF
1.0nF
2.2nF
6.8nF
t
C
0.533 RT CT
≈
(EQ. 1)
t
D
RT
–
CT In0.008 RT
3.83
1.71
–
–
≈
(EQ. 2)
f
1
tC
tD
+
(
)
=
(EQ. 3)
D
t
C
f
=
(EQ. 4)
I
OUT
Qg
f
×
=
(EQ. 5)
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL8841AAUZ | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| ISL8841AMBZ | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| ISL8841AMUZ | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| ISL8842A | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| ISL8842AABZ | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL8841AABZ-T | 功能描述:IC REG CTRLR BST FLYBK ISO 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| ISL8841AAUZ | 功能描述:IC REG CTRLR BST FLYBK ISO 8MSOP 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) |
| ISL8841AAUZ-T | 功能描述:IC REG CTRLR BST FLYBK ISO 8MSOP 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) |
| ISL8841AMBEP | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 1A 8SOIC N - Rail/Tube |
| ISL8841AMBEP-TK | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 1A 8SOIC N - Tape and Reel |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。