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| 型号： | ISL97677IRZ |
| 厂商： | Intersil |
| 文件页数： | 19/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR PWM CTRL 8CH 32QFN |
| 标准包装： | 60 |
| 拓扑： | 线性（LDO），PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 500kHz ~ 1.5MHz |
| 电源电压： | 4.75 V ~ 26 V |
| 输出电压： | 45V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
ISL97677
For example, the Cbt = 50% duty cycle programmed in
the SMBus Register 0x00 and the PWM frequency is
tuned to be 200Hz with an appropriate capacitor at the
FPWM pin. On the other hand, PWMI is fed with a 1kHz
30% high PWM signal. When PWM_SEL = 0 and
PWM_MD = 0, the device is in DPST operation where
DPST brightness = 15% PWM dimming at 200Hz.
? All reserved bits return a “0” when read.
? All reserved bits have no functional effect when
written.
? All defined control bits return their current, latched
value when read.
? A value of 1 written to BL_CTL turns on the BL in 4ms
or less after the write cycle completes. The BL is
deemed to be on when Bit 3 BL_STAT of Register 0x02
is 1 and Register 0x09 is not 0. See Tables 2A and 2B.
? A value of 0 written to BL_CTL immediately turns off the
BL. The BL is deemed to be off when Bit 3 BL_STAT of
Register 0x02 is 0 and Register 0x09 is 0. See Tables 2A
and 2B.
? **Note that the behavior of Register 0x00
(Brightness Control Register) is affected by certain
combinations of the control bits, as shown in Table 3
“Operating Modes Selected by Device Control
Register Bits 1 and 2.”
? When an SMBus mode is selected, Register 0x00
reflects the last value written to it. But, when any
non-SMBus mode is selected, Register 0x00 reflects
the current brightness value based on the current
mode of operation, with the exception of SMBus
mode with DPST, where PWM_MD = 0 and
PWM_SEL = 0.
? When SMBus mode with DPST is selected, Register
0x00 reflects the last value written to it from SMBus.
? When a write to Register 0x01 (Device Control
Register) causes the backlight controller to transition
to an SMBus mode, the brightness of the BL does not
change. On the other hand, when a write to Register
0x01causes the backlight controller to transition to a
non-SMBus mode, the brightness of the BL changes
as appropriate for the new mode.
? The default value for Register 0x01 is 0x00.
Fault/Status Register (0x02)
This register has 6 status bits that allow monitoring of
the backlight controller’s operating state. Bit 0 is a logical
“OR” of all fault codes to simplify error detection. Not all
of the bits in this register are fault related (Bit 3 is a
simple BL status indicator). The remaining bits are
reserved and return a “0” when read and ignore the bit
value when written. All of the bits in this register are
19
read-only, with the exception of bit 0, which can be
cleared by writing to it.
? A Read Byte cycle to Register 0x02 indicates the
current BL on/off status in BL_STAT (1 if the BL is on,
0 if the BL is off).
? A Read Byte cycles to Register 0x2 also returns
FAULT as the logical OR of THRM_SHDN, OV_CURR,
2_CH_SD, and 1_CH_SD should these events occur.
? 1_CH_SD returns a 1 if one or more channels have
faulted out.
? 2_CH_SD returns a 1 if two or more channels have
faulted out.
? A fault will not be reported in the event that the BL is
commanded on and then immediately off by the
system.
? When FAULT is set to 1, it will remain at 1 even if the
signal which sets it goes away. FAULT will be cleared
when the BL_CTL bit of the Device Control Register is
toggled or when written low. At that time, if the fault
condition is still present or reoccurs, FAULT will be
set to 1 again. BL_STAT will not cause FAULT to be
set .
? The controller will not indicate a fault if the VBL+
goes away, whether or not the LEDs were on at the
time of the power loss. This can occur if there is
some hang condition that causes the user to force
the system off by holding the power button down
for 4s.
? The default value for Register 0x02 is 0x00.
Identification Register (0x03)
The ID register contains 3-bit fields to denote the LED
driver (always set to 1), manufacturer and the silicon
revision of the controller IC. The bit field widths allow up
to 16 vendors with up to 8 silicon revisions each. In order
to keep the number of silicon revisions low, the revision
field will not be updated unless the part will make it out
to the user’s factory. Thus, if during the engineering
development process, 3 silicon spins were needed, the
next available revision ID would be used for all 3 spins
until that same ID made it to the factory. Except Bit 7,
which has to be 1, all of the bits in this register are
read-only.
? Vendor ID 9 represents Intersil Corporation.
? The default value for Register 0x03 is 0xC8.
The initial value of REV shall be 0. Subsequent values of
REV will increment by 1.
Components Selections
According to the inductor Voltage-Second Balance
principle, the change of inductor current during the
switching regulator On-time is equal to the change of
inductor current during the switching regulator Off-time.
FN6996.1
November 13, 2009
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| ISL97677IRZ-T | 功能描述:IC LED DVR PWM CTRL 8CH 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| ISL97677IRZ-TK | 功能描述:IC LED DVR PWM CTRL 8CH 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| ISL97678IRZ | 功能描述:IC LED DVR PWM DIMMING 8CH 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| ISL97678IRZ-T | 功能描述:IC LED DVR PWM DIMMING 8CH 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| ISL97678IRZ-TK | 功能描述:IC LED DVR PWM DIMMING 8CH 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
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