參數(shù)資料
型號(hào)： CAT3636
英文描述： 6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3
中文描述： 6聲道四ModeTM分?jǐn)?shù)的LED驅(qū)動(dòng)器在TQFN3x3
文件頁(yè)數(shù)： 12/15頁(yè)
文件大?。?/td> 434K
代理商： CAT3636
CAT3636
Doc. No. 5020 Rev. A
12
2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Unused LED Channels
For applications with only four or two LEDs, unused
LED banks can be disabled via the enable register
internally and left to float.
For applications with 5 LEDs or less, unused LEDs
can also be disabled by connecting the LED pin
directly to VOUT, as shown on Figure 4. If LED pin
voltage is within 1V of VOUT, then the channel is
switched off and a 200
μ
A test current is placed in the
channel to sense when the channel moves below
VOUT – 1V.
Figure 4. Five LED Application
Protection Mode
If an LED is disconnected, the output voltage VOUT
automatically limits at about 5.5V. This is to prevent
the output pin from exceeding its absolute maximum
rating.
If the die temperature exceeds +150°C the driver will
enter a thermal protection shutdown mode. When the
device temperature drops by about 20°C the device
will resume normal operation.
LED Selection
LEDs with forward voltages (V
F
) ranging from 1.3V to
5.0V may be used with the CAT3636. Selecting LEDs
with lower V
F
is recommended in order to improve the
efficiency by keeping the driver in 1x mode longer as
the battery voltage decreases.
For example, if a white LED with a V
F
of 3.3V is
selected over one with V
F
of 3.5V, the CAT3636 will
stay in 1x mode for lower supply voltage of 0.2V. This
helps improve the efficiency and extends battery life.
External Components
The driver requires two external 1
μ
F ceramic
capacitors for decoupling input, output, and for the
charge pump. Both capacitors type X5R and X7R are
recommended for the LED driver application. In all
charge pump modes, the input current ripple is kept
very low by design and an input bypass capacitor of
1
μ
F is sufficient.
In 1x mode, the device operates in linear mode and
does not introduce switching noise back onto the
supply.
Recommended Layout
In charge pump mode, the driver switches internally at
a high frequency. It is recommended to minimize trace
length to all four capacitors. A ground plane should
cover the area under the driver IC as well as the
bypass capacitors. Short connection to ground on
capacitors CIN and COUT can be implemented with
the use of multiple via. A copper area matching the
TQFN exposed pad (TAB) must be connected to the
ground plane underneath. The use of multiple via
improves the package heat dissipation.
Figure 5. Recommended Layout
相關(guān)PDF資料
PDF描述
CAT3636HV32 6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3
CAT3636HV3T 6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CAT3636_07 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3
CAT3636_08 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3
CAT3636HV3 制造商:ON Semiconductor 功能描述:IC 6-LED DRIVER QUAD HI EFFICIENCY
CAT3636HV32 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3
CAT3636HV3-GT2 功能描述:LED照明驅(qū)動(dòng)器 LED Driver,Quad mode,6 ch 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
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