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參數(shù)資料
| 型號： | TPS60251RTW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE |
| 中文描述： | 高效電荷泵7，帶有I2C接口個WLED |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 515K |
| 代理商： | TPS60251RTW |
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x1Operating
Area
x1.5 Operating
Area
V
I
V
I
V
O
VA
VF
VDX
CP WLED Driver
VB
VC
VHYS
TPS60251
SLVS767–APRIL 2007
APPLICATION INFORMATION (continued)
Figure 13. Input Voltage Hysteresis Between
×
1 and
×
1.5 Mode
As shown in
Figure 13
, there is input voltage hysteresis voltage between 1
×
and 1.5
×
mode to ensure stable
operation during mode transition. For the 1 cell Li-Ion battery input voltage range, the TPS60251 operates in 1
×
mode when a fully charged battery is installed. Once the battery voltage drops below the V
B
level, which is the
mode transition voltage from 1
×
to 1.5
×
, the WLED driver operates in 1.5
×
mode. Once in 1.5
×
mode, the battery
voltage must rise to the V
C
level in order to transition from 1.5
×
to 1
×
. This hysteresis ensures stable operation
when there is some input voltage fluctuation at the 1
×
/1.5
×
mode transition. The WLED driver provides a typical
280mV hysteresis voltage (V
HYS
) that changes based on LED current, to prevent oscillating between modes.
The transition voltage, V
B
, depends on V
DX
(the mode transition threshold voltage), V
F
(WLED forward voltage
drop) and V
A
(the drop out voltage of the charge pump stage) and is calculated as follows:
V
B
= V
A
+ V
F
+ V
DX
V
A
= R
OUT1X
×
I
LEDTOTAL
Where R
is the 1
×
mode output impedance of the IC. See the Electrical Characteristics table for output
impedance specifications.
The TPS60251 switches to 1.5
×
mode when the input voltage is below V
B
and remains in 1.5
×
mode as long as
the input is lower than V
C
. 1.5
×
Mode is exited when the input voltage rises above V
C
. V
C
is calculated as:
V
C
= V
F
+ 470 mV
The input voltage mode transition hysteresis voltage (V
HYS
) between 1
×
and 1.5
×
is calculated using the
following equation.
V
HYS
= V
C
– V
B
= 470 mV – V
DX
– V
A
, where V
DX
= 100 mV
Note that V
A
is the key factor in determining V
HYS
and is dependant on the 1
×
mode charge pump output
impedance and WLED current.
11
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS60251RTWR | 功能描述:LED照明驅動器 High Eff Charge Pump 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWRG4 | 功能描述:LED照明驅動器 High Eff Charge Pump 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWT | 功能描述:LED照明驅動器 High Eff Charge Pump 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWT | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter IC |
| TPS60251RTWTG4 | 功能描述:LED照明驅動器 High Eff Charge Pump 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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