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参数资料
| 型号： | CAT4106YP-T2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 4CH BOOST 16TSSOP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 汽车，背光，通用型 |
| 频率： | 700kHz ~ 1.3MHz |
| 电源电压： | 3 V ~ 5.5 V |
| 输出电压： | 36V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | CAT4106YP-T2OSDKR |
CAT4106
R6 + R7
* 1
R4 + R5
* 1
V L
The external resistor R6 value needed to set a VFMIN
level of 18 V is calculated as follows:
18 V
1.2 V
For R7 = 20 k W , R6 = 280 k W .
Setting VFMAX Level (Open ? LED)
The VFMAX level represents the maximum level expected
for the LED string voltage “window of operation”. This
voltage setting is based on the number of series LEDs being
used and the expected maximum V F during normal operation.
Example: Consider a string of 6 LEDs in series, with each
LED having a V F range of 3.5 V ± 0.5 V. Since the
maximum V F of each LED is 4.0 V, the overall maximum
expected string voltage would be 24 V. Any string voltage
which appears greater than 24 V would be considered as
containing an open ? circuit in one or more of the series
LEDs. The external resistor R4 value needed to set a
VFMAX level of 24 V is calculated as follows:
24 V
1.2 V
During PWM dimming, the recommended minimum
pulse width interval (either High or Low) is 0.2 m s. The
recommended maximum pulse width during PWM
dimming is 2.5 ms, however this only applies to the Low
pulse interval. Pulse durations extending past 2.5 ms may
cause the device to enter full shutdown mode. The LED
channel response time is much longer if the device has been
in shutdown mode.
For most applications, a maximum dimming resolution
can be achieved with PWM clock frequencies in the range
of 100 Hz to 2 kHz. Pulse width intervals of 1 m s, allows up
to 1000:1 dimming ratio at 1 kHz PWM frequency.
One or Two LED String Applications
The CAT4106 can be used to drive one or two strings of
LEDs by connecting together some LED pins. Also for
applications requiring LED current greater than 175 mA,
LED channels can be tied together, assuming the supply is
suitable to drive the load. Figure 27 shows a typical
application for driving a single string of LEDs. The LED
current is equal to four times the channel current.
L D
For R5 = 20 k W , R4 = 380 k W .
In normal operation, the LED string which has the largest
V F will be used to set the VCTRL/VFB voltage levels. If the
largest string voltage tries to exceed VFMAX setting, it will
no longer be allowed to control the voltage level of
V IN
C2
C1
VIN
C3
SW VFMAX
VFMIN
CAT4106
R4
R5
R6
R7
RSET
VCTRL
FB GND PGND
VCTRL/VFB (i.e. it will be ignored) and subsequently the
next largest LED string voltage will then be used in the
control loop. All remaining functional LED channels will
continue to operate as normal. If a disconnected LED string
is reconnected, the FAULT flag remains on and the channel
disabled until the device has been re ? enabled with the EN
pin going from low to high.
If all LED channels are detected as being open ? circuit,
OFF... ON... DIM...
R2
R1 R3
EN/PWM LED1
LED2
LED3
LED4
FAULT
V IN
R8
LED Fault Detection
(open drain pull ? down)
then the boost converter will limit the output voltage to the
VFMAX setting. This eliminates the need for an external
protection zener.
Figure 27. Application Circuit for One LED String
Figure 28 shows a typical application for driving two
strings of LEDs. The LED current is equal to two times the
Enable and PWM Dimming Control
EN/PWM input signal provides two independent
channel current.
V L
L
D
functions. The first function is to enable and disable the
entire device. The second function is to apply PWM
dimming on the output channels while the chip remains fully
enabled. Applying logic high on the EN/PWM input will
power up the device. The device will continue to remain
powered up, even in the presence of PWM signals being
V IN
C2
C1
VIN
C3
SW VFMAX
VFMIN
CAT4106
R4
R5
R6
R7
RSET
FB GND PGND
applied. To disable the device into complete system
shutdown mode, a logic low must be applied to the
EN/PWM input for typically 5 ms.
The duty cycle applied at the EN/PWM is directly applied
to all the output channels. Each time the input is taken low,
all output channels will immediately be switched off and the
channels will resume normal operation when the PWM is
taken back high. The response time of the channels when
switching ON or OFF is typically 0.2 m s.
OFF... ON... DIM...
EN/PWM LED1
LED2
R2 LED3
VCTRL LED4
FAULT V IN
R8
R1 R3
LED Fault Detection
(open drain pull ? down)
Figure 28. Application Circuit for Two LED Strings
http://onsemi.com
11
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