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参数资料
| 型号： | ISL78100ARZ-T |
| 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： | 6,000 |
| 拓扑： | PWM，降压（降压），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： | 车载，背光 |
| 频率： | 800kHz ~ 1.2MHz |
| 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： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
ISL78100
Component Selection
VBAT
10μH
Input Capacitor
VBAT FAULT
VIN
ISL78100
SWD1
L1
VOUT
COUT
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
SWD2
ZOVP
R1
20μF
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
FIGURE 33. EXTERNAL OVP CIRCUIT
current flow in the input capacitor is given by Equation 3:
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 V IN and VDC regulates VDC to 5V,
to power control and gate drive circuits when V IN 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 V IN .
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 capacitors.
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
CREG
0.47μF
THERMISTOR
CLOSE
TO LEDs
the fault protection switch, as shown in Figures 39 and 40.
Inductor
VIN
VDC
LDO
TMAX
RM1
20k
Careful selection of inductor value will optimize circuit
operation. Inductor type and value influence many key
+
RM2
80k
parameters, including ripple current, current limit, efficiency,
transient performance and stability. Internal slope
compensation has been optimized for inductor values
FB LEVEL
CURRENT
-
TEMPERATURE
COMPENSATION
TEMP
GND
RT
10k
between 4.7μH and 10μH. Ensure the inductor current rating
is capable of handling the current limit value in the
configuration used (2.4A for buck, 3.5A for boost). If an
ISL78100
FIGURE 34. OVER-TEMPERATURE CIRCUIT
13
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
level, poor efficiency and overheating in the core.
FN6626.1
December 24, 2013
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL78100ARZ-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:- 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 |
| ISL78200 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter |
| ISL78200AVEZ | 功能描述:IC REG BUCK BOOST SYNC 20HTSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
| ISL78200AVEZ-T | 功能描述:IC REG BUCK BOOST SYNC 20HTSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
| ISL78201AVEZ-T | 制造商:Intersil Corporation 功能描述:2.5A SYNC BUCK W PRE-BOOST REG, 20LD HTSSOP 4.4MM, T&R - Tape and Reel |
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