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參數(shù)資料
| 型號： | L5993D |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CONSTANT POWER CONTROLLER |
| 中文描述： | 恒功率控制器 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大?。?/td> | 200K |
| 代理商： | L5993D |
ered at pin 1 and definesthe upperextreme of the
duty cycle range, D
x
(see pin 15 for D
x
definition
and calculation).
In case V
15
is connectedto VREF, however, the
switching frequency of the system will be a half
f
osc
.
If the IC is to be synchronizedto an externaloscil-
lator, R
T
and C
T
should be selected for a f
osc
lower than the master frequency in any condition
(typically, 10-20% ), depending on the tolerance
of R
T
and C
T
.
Pin 3.
DC (Duty Cycle Control). By biasing this
pin with a voltagebetween1 and 3 V it is possible
to set the maximumduty cycle between 0 and the
upper extremeD
x
(see pin 15).
If D
max
is the desired maximum duty cycle, the
voltageV3 to be appliedto pin 3 is:
V
3
= 5 - 2
(2-Dmax)
(4)
D
max
is determined by internal comparison be-
tween V3 and the oscillator ramp (see fig. 22),
thus in case the device is synchronized to an ex-
ternal frequency f
ext
(and therefore the oscillator
amplitudeis reduced),(4) changes into:
V
3
=
5
4
exp
A voltage below 1V will inhibit the driver output
stage. This could be used for a not-latcheddevice
disable, for example in case of overvoltage pro-
tection(see applicationideas).
If no limitation on the maximum duty cycle is re-
D
max
R
T
C
T
f
ext
(5)
quired (i.e. D
MAX
= D
X
), the pin has to be leftfloat-
ing. An internal pull-up (see fig. 22) holds the volt-
age above 3V. Should the pin pick up noise (e.g.
during ESD tests), it can be connected to VREF
througha 4.7k
resistor.
Pin 4.
VREF (Reference Voltage). The device is
provided with an accurate voltage reference
(5V
±
1.5%) able to deliver some mA to an external
circuit.
A small film capacitor (0.1
μ
F typ.), connected
between this pin and SGND, is recommended to
ensure the stability of the generator and to prevent
noisefrom affectingthereference.
Before device turn-on, this pin has a sink current
capabilityof 0.5mA.
+
-
R2
R3
R1
CLAMP
D1
50
R
T
C
T
D
R
Q
600
μ
A
D97IN500B
V
REF
RCT
SYNC
CLK
2
4
1
Figure 21. Oscillatorand synchronization internalschematic.
+
-
R2
R1
R
T
C
T
D97IN711A
V
REF
RCT
DC
TO PWM LOGIC
4
3
2
23K
28K
3
μ
A
Figure22. Duty cycle control.
L5993
9/22
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| L5993D013TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L5994 | 功能描述:電流型 PWM 控制器 Adj Triple Out Pwr 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L5994_02 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| L5994A | 功能描述:監(jiān)控電路 ADJT TRIPLE OUTPUT POWER SUPPLY CNTLR RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| L5995 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
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