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參數(shù)資料
| 型號： | UCC2581D |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Very low drop voltage regulators with inhibit |
| 文件頁數(shù)： | 4/9頁 |
| 文件大小： | 241K |
| 代理商： | UCC2581D |
4
UCC1581
UCC2581
UCC3581
The UCC3581’s oscillator allows the user the flexibility to
program the frequency and the duty cycle by adjusting
two resistors and a capacitor. Application Diagram Fig. 1
shows these components as RT1, RT2, and C
T
. RT1 pro-
grams the timing capacitor charging current which results
in a linear ramp charging C
T
. Discharge of C
T
is accom-
plished though RT2 which results in a standard RC dis-
charge waveform. The oscillator on-time (C
T
charging) is
calculated by the formula
t
RT
C
ON
T
=
0082
.
1
.
The off-time (C
T
discharging) is calculated by the formula
t
RT
C
OFF
T
=
0 95
.
1
.
Resistor RT1 programs the charging current. The current
is:
2.0V
RT1.
CT charging current is 9.2 times the current in RT1. RT1
can range from 220k
to 1M
. Minimum capacitor size is
100pF, and minimum RT2 size is 10k.
A Block Diagram of the Oscillator is shown in Fig. 2. The
oscillator also has an external synchronization pin.
When a low to high level is detected, and if the oscilla-
tor’s output is in the high state (C
T
charging), the oscilla-
tor
output
immediately
goes
discharging. The sync input is rising edge sensitive and
is ignored when the oscillator output is low.
low
and
C
T
starts
APPLICATION INFORMATION
1
3
2
14
C
T
BSS129 OR
EQUIV.
RT2
V
IN
1
μ
F
D2
4
Q1
5
6
1
μ
F
7
T1
R
L
REF &
E/A
U1
CT
GT
VDD
OUT
GND
REF
ISEN
V
IN
8
VC
9
DCMIN
10
SS
11
EN
U1
REF
REF
C
SS
12
RT1
13
SYNC
RT2
RT1
REF
UCC3581
D1
Figure 1. Application diagram.
UDG-99043
Figure 2. Oscillator.
UDG-96105
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC2581DG | 制造商:Texas Instruments 功能描述: |
| UCC2581DG4 | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Micropower RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC2581DTR | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Micropower RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC2581DTRG4 | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Micropower RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC2581J | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Micropower Voltage Mode PWM |
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