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参数资料
| 型号： | ISL78100ARZ-TK |
| 厂商： | Intersil |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER AUTOMOTIVE 20-QFN |
| 标准包装： | 1,000 |
| 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
TABLE 4. BOOST MODE COMPENSATION 12V OPERATION
VOUT (V)
7
10.5
14
17.5
21
24.5
28
VFB
I OUT
LED’s
2
3
4
5
6
7
8
50mV
50mA
Electrolytic
Ceramic
DMIN
DMIN
DMIN
60μF
40μF
40μF
40μF
100mV
100mA
Electrolytic
47μF
47μF
Ceramic
DMIN
DMIN
DMIN
40μF
20μF
40μF
40μF
200mV
350mA
Electrolytic
47μF
47μF
Ceramic
DMIN
DMIN
DMIN
40μF
20μF
40μF
40μF
200mV
1A
Electrolytic
47μF
47μF
Ceramic
DMIN
DMIN
DMIN
20μF
20μF
40μF
40μF
CERAMIC CAPACITORS
Many ceramic capacitors have strong voltage and
temperature coefficients, which reduces effective
capacitance as the applied voltage or operating temperature
is increased. Pay careful attention when selecting ceramic
capacitor type. X5R and X7R families provide much better
stability than Y5V, which should generally be avoided unless
additional capacitance is added to compensate for the
significant changes in value, which occurs overvoltage and
temperature.
TABLE 5. CERAMIC CAPACITOR VARIABILITY
? Place several via holes (thermal vias) under the chip to a
backside ground plane to improve heat dissipation
? Maximize the copper area around the thermal vias to
spread heat away from the chip.
Cost-Sensitive Applications
For cost-sensitive applications, the BOM can be reduced
considerably by:
1. Removing temperature compensation
2. Removing the fault-protection switch
3. Removing the load isolation switch
TYPICAL VOLTAGE
TEMPERATURE
4. Switching the FB into internal fixed bias mode (400mV
CAPACITOR TYPE
X7R, 10V
X5R, 25V
Y5V, 6.3V
VARIATION
-30% at 10V
-50% at 25V
-90% at 6.3V
VARIATION
-15% at +125°C
-9% at +85°C
-65% at +85°C
across V FB )
In this configuration, light level may be controlled using the
EN/PWM input to modulate the output current.
In the absence of the load isolation switch, LED bias current
will vary with PWM duty cycle, due to the discharge of the
Layout Considerations
PCB layout is very important for the converter to function
properly. The following general guidelines should be
followed:
? Separate the Power Ground and Signal Ground; connect
them only at one point close to the GND pin.
? Maximize the Power Ground area as much as possible. It
is essential to ensure the Power Ground return between
C IN , C OUT , and SWS1,2 as least obstructive as possible.
? Place the input capacitor close to VIN and SWS1, SWS2
pins in boost mode.
? Make the following PC traces as short as possible:
- from SWD1, SWD2 to the inductor in boost mode
- from SWS1,SWS2 to the inductor in buck mode
- from C OUT to PGND
? Feedback signals levels are small to improve efficiency.
Ensure the reference connection (GND or VIN) between
the sense resistor and IC pin doesn't carry switching
current.
15
output capacitor by the LED’s during the PWM off-time.
Therefore, low dimming frequencies can only be used in
such an application.
FN6626.1
December 24, 2013
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相关代理商/技术参数 |
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|---|---|
| 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 |
| ISL78201AVEZ-TR5303 | 制造商:Intersil Corporation 功能描述: 制造商:Intersil Corporation 功能描述:HARMAN BECKER ISL78201AVEZ-T W/SPECIAL CHANGE CONTROL, 12 MO - Tape and Reel |
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