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參數(shù)資料
| 型號(hào)： | LP3958 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Lighting Management Unit with High Voltage Boost Converter |
| 中文描述： | 照明管理股高電壓升壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 14/28頁(yè) |
| 文件大?。?/td> | 1091K |
| 代理商： | LP3958 |
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Functionality of Keypad LED Outputs (KEY1, KEY2, KEY3)
(Continued)
External PWM Control
The GPIO[0]/PWM pin can be used to control the KEY
output. PWM function for the pin is selected by writing EN-
_PWM_PIN high in GPIO control register (address 06H).
Note, that EN_KEYP bit must be set high. Each LED output
can be enabled with K1SW, K2SW and K3SW bits.
EN_EXT_K1_PWM,
EN_EXT_K2_PWM
EN_EXT_K3_PWM bits are used to select, which LED out-
puts are controlled with the external PWM input. Note that
Keypad LEDs Driver Performance Characteristics
and
polarity of external PWM control is active high i.e. when high,
then LED output is enabled. If KEYP_PWM is set low, then
each selected LED output is controlled directly with external
PWM input. If KEYP_PWM is set high, then internal PWM
control is modulated by the external PWM input. In latter
case, internal PWM control is passed to LED when external
PWM input is high.
Symbol
I
LEAKAGE
I
MAX(KEY)
Parameter
KEY1, KEY2, KEY3 pin leakage current
Maximum recommended sink current
Condition
Min
Typ
Max Units
1
15
60
μA
mA
mA
%
CC mode
SW mode
CC mode
CC mode
I
KEY
set to 15mA, CC mode
SW mode
Accuracy same as internal clock
frequency accuracy
I
KEY
set to 15mA
Accuracy
@
15mA
Current mirror ratio
KEY current matching error
Switch resistance
KEY internal PMW switching frequency
5
1:100
3
3.5
20
%
kHz
R
SW
KEY
V
SAT
Note:
KEY current should be limited as follows:
constant current mode
– limited by external R
resistor
switch mode
– limited by external ballast resistors
Saturation voltage (current drop 10%)
100
500
mV
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3958TL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management Unit with High Voltage Boost Converter |
| LP3958TL/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP3958TLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management Unit with High Voltage Boost Converter |
| LP3958TLX/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP395Z | 功能描述:兩極晶體管 - BJT RoHS:否 制造商:STMicroelectronics 配置: 晶體管極性:PNP 集電極—基極電壓 VCBO: 集電極—發(fā)射極最大電壓 VCEO:- 40 V 發(fā)射極 - 基極電壓 VEBO:- 6 V 集電極—射極飽和電壓: 最大直流電集電極電流: 增益帶寬產(chǎn)品fT: 直流集電極/Base Gain hfe Min:100 A 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PowerFLAT 2 x 2 |
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