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参数资料
| 型号： | ISL97677IRZ-TK |
| 厂商： | Intersil |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR PWM CTRL 8CH 32QFN |
| 标准包装： | 1,000 |
| 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： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
ISL97677
TABLE 1. PROTECTIONS TABLE
V OUT
REGULATED
CASE
1
FAILURE MODE
CH1 Short Circuit
DETECTION MODE
Upper
FAILED CHANNEL ACTION
CH1 ON and burns power
GOOD CHANNELS ACTION
CH2 through CH8 Normal
BY
Highest VF of
Over-Temperature
Protection limit (OTP)
not triggered and
VI IN0 < VSC
CH2 through
CH8
2
CH1 Short Circuit
Upper OTP triggered
CH1 goes off
Same as CH1
Highest VF of
but V IN1 < VSC
CH2 through
CH8
3
CH1 Short Circuit
Upper OTP not
triggered but VI IN1 >
VSC
CH1 disabled after 6 PWM
cycles time-out.
If 3 channels are already
shut down, all channels will
be shut down. Otherwise
Highest VF of
CH2 through
CH8
CH2-8 will remain as normal
4
CH1 Open Circuit
with infinite
resistance
Upper OTP not
triggered and VIIN1
< VSC
V OUT will ramp to OVP. CH1 will CH2 through CH8 Normal
time-out after 6 PWM cycles
and switch off. V OUT will drop
to normal level.
Highest VF of
CH2 through
CH8
5
CH1 LED Open
Upper OTP not
CH1 remains ON and has
CH2 through CH8 ON, Q2
VF of CH1
Circuit but has
paralleled Zener
triggered and VI IN1 < highest VF, thus V OUT
VSC increases
through Q8 burn power
6
CH1 LED Open
Upper OTP triggered
CH1 goes off
Same as CH1
VF of CH1
Circuit but has
paralleled Zener
but VI IN1 < VSC
7
CH1 LED Open
Upper OTP not
CH1 OFF
CH2 through CH8 Normal
Highest VF of
Circuit but has
paralleled Zener
triggered but VIIN1 >
VSC
CH2 through
CH8
Upper OTP not CH1 remains ON and has
triggered but VIINx > highest VF, thus V OUT
VSC increases.
V OUT increases then CH-X
switches OFF. This is an
unwanted shut off and can
be prevented by setting OVP
and/or VSC at an
appropriate level.
VF of CH1
8
9
Channel-to-
Channel Δ VF too
high
Channel-to-
Channel Δ VF too
Lower OTP triggered
but VIINx < VSC
Upper OTP triggered
but VIINx < VSC
Any channel at below the target current will fault out after
6 PWM cycles.
Remaining channels driven with normal current.
All channels switched off
Highest VF of
CH1 through
CH8
Highest VF of
CH1 through
high
CH8
10
Output LED string
voltage too high
V OUT > VOVP
Driven with normal current. Any channel that is below the
target current will time-out after 6 PWM cycles.
Highest VF of
CH1 through
CH8
11
V OUT /LX shorted
to GND
15
LX will not switch
FN6996.1
November 13, 2009
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