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参数资料
| 型号： | ISL97801ARZ |
| 厂商： | Intersil |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER AUTOMOTIVE 20-QFN |
| 标准包装： | 75 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 频率： | 850kHz ~ 1.15MHz |
| 电源电压： | 2.7 V ~ 16 V |
| 输出电压： | 32V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（4x4） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 105°C |
ISL97801
Component Selection
VBAT
10μH
Input Capacitor
VBAT FAULT
VIN
ISL97801
SWD1
SWD2
L1
ZOVP
R1
VOUT
COUT
20μF
Switching regulators require input capacitors to deliver peak
charging current and to reduce the impedance of the input
supply. This reduces interaction between the regulator and
input supply, improving system stability. The high switching
frequency of the loop causes almost all ripple current to flow
FB
SWS1 SWS2
100
0.5
RSENSE
in the input capacitor, which must be rated accordingly.
Considerably more input current ripple is generated in buck
mode than boost mode. In buck mode input current is
alternately switched between I OUT and zero. The rms
current flow in the input capacitor is given by:
FIGURE 33. EXTERNAL OVP CIRCUIT
I CAPRMS = I OUT ? ( D – D )
Over Temperature Shutdown
An internal sense circuit disables PWM switching if the die
2
(EQ. 3)
temperature exceeds +135°C. Switching is re-enabled when
the temperature falls below +100°C.
Internal 5V LDO
An internal LDO between VIN and VDC regulates VDC to
5V, to power control and gate drive circuits when VIN
exceeds 5.1V. In normal operation decouple VDC with at
least 3.3μF. In applications where the input supply is less
than 5.5V, VDC should be tied directly to VIN.
LED Temperature Control
LED lifetime reduces dramatically with elevated
temperature. An over temperature control circuit utilizing the
thermistor voltage at TEMP reduces the LED bias current
when VTEMP exceeds the threshold voltage on TMAX. To
minimize noise injection use a potential divider between
VDC and GND to set the voltage on TMAX, as shown in
Figure 34. The value of TMAX for a specific threshold
temperature is determined by the choice of thermistor
temperature coefficient. Disable the function by connecting
the TMAX pin to VDC and TEMP pin to GND .
Where: D = Duty Cycle
The input current is maximum for D = 0.5 and when I OUT
approaches current limit (2.4A) giving a value of around
1.2A.
A capacitor with low internal series resistance should be
chosen to minimize heating effects and improve system
efficiency, such as X5R or X7R ceramic capacitors, which
offer small size and a lower value of temperature and voltage
coefficient compared to other ceramic caps.
In boost mode input current flows continuously into the
inductor, with an AC ripple component proportional to the
rate of inductor charging only and smaller value input
capacitors may be used. It is recommended that an input
capacitor of at least 10μF be used. Ensure the voltage rating
of the input capacitor is suitable to handle the full supply
range.
In automotive applications the input capacitor can be
protected from exposure to high voltages present during
fault conditions (load dump) by connecting it downstream of
the fault protection switch, as shown in Figures 39 and 40.
0.47uF
CREG
Thermistor
Close to
LED's
Inductor
Careful selection of inductor value will optimise circuit
VIN
LDO
VDC
TMAX
RM1
20k
RM2
80k
operation. Inductor type and value influence many key
parameters, including ripple current, current limit, efficiency,
transient performance and stability. Internal slope
compensation has been optimised for inductor values
+
between 4.7μH and 10μH. Ensure the inductor current rating
FB Level Adjust
Current
-
Temp
TEMP
RT
10K
is capable of handling the current limit value in the
configuration used (2.4A for buck, 3.5A for boost). If an
EL7801
Compensation
GND
inductor core is chosen with too low a current rating,
saturation in the core will cause the effective inductor value
to fall, leading to an increase in peak to average current
FIGURE 34. OVER-TEMPERATURE CIRCUIT
13
level, poor efficiency and overheating in the core.
FN6428.1
April 2, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97801ARZ-T | 功能描述:IC LED DRIVER AUTOMOTIVE 20-QFN 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 |
| ISL97801ARZ-TK | 功能描述:IC LED DRIVER AUTOMOTIVE 20-QFN 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 |
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