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參數(shù)資料
| 型號： | ISL6845 |
| 廠商： | Intersil Corporation |
| 英文描述： | Improved Industry Standard Single Ended Current Mode PWM Controller |
| 中文描述： | 改進的工業(yè)標準單端電流模式PWM控制器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 264K |
| 代理商： | ISL6845 |
6
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 calculated from the
following equations:
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 0 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.
Typical Performance Curves
FIGURE 1. FREQUENCY vs TEMPERATURE
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
FIGURE 3. EA REFERENCE vs TEMPERATURE
FIGURE 4. RTCT vs FREQUENCY
1.02
1.01
1
0.99
0.98
0.97
-40
-10
20
50
80
110
TEMPERATURE (
o
C)
N
TEMPERATURE (
o
C)
N
R
1.001
1
0.999
0.998
0.997
0.996
0.995
-40
-25
-10
5
20
35
50
65
80
95 110
TEMPERATURE (
o
C)
N
1.002
1
0.998
0.996
0.994
-40 -25
-10
5
20
35
50
65
80
95
110
1-10
3
100
10
1
10
20
30
40
50
RT (k
)
60
70
80
90
100
F
CT=
100pF
220pF
330pF
470pF
1.0nF
2.2nF
3.3nF
4.7nF
TC
0.583
RT
CT
≈
(EQ. 1)
TD
RT
–
CT
–
----------------------------------–
ln
≈
(EQ. 2)
f
1
TC
TD
+
(
)
=
(EQ. 3)
D
TC
f
=
(EQ. 4)
ISL6842, ISL6843, ISL6844, ISL6845
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PDF描述 |
|---|---|
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| ISL6845IU | Octal Buffers/Drivers With 3-State Outputs 20-SO -40 to 85 |
| ISL6845IBZ | Improved Industry Standard Single-Ended Current Mode PWM Controller |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6845IB | 功能描述:電流型 PWM 控制器 Single-End Current RoHS:否 制造商:Texas Instruments 開關頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6845IB-T | 功能描述:IC REG CTRLR BST FLYBK ISO 8SOIC 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: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) |
| ISL6845IBZ | 功能描述:電流型 PWM 控制器 CUR MODE PWM 50% DUT CYCLE 8.4V UVLO 8LD RoHS:否 制造商:Texas Instruments 開關頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6845IBZ-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:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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) |
| ISL6845IRZ-T | 功能描述:IC REG CTRLR BST FLYBK ISO 8-DFN 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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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) |
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