- 您现在的位置：买卖IC网 > PDF目录20763 > ISL78100ARZ-T (Intersil)IC LED DRIVER AUTOMOTIVE 20-QFN PDF资料下载
参数资料
| 型号： | ISL78100ARZ-T |
| 厂商： | Intersil |
| 文件页数： | 14/19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
Rectifier Diode
In buck mode:
V RIPPLE = ----------------------------------------------- × ? --------------------------- + ESR ?
2 × f s × L
? f × C ?
V OUT
A high speed rectifier diode is necessary to prevent
excessive voltage overshoot, especially in the boost
configuration. Low forward voltage and reverse leakage
current will minimize losses, making Schottky diodes the
preferred choice. Similarly to the inductor, a diode with a
suitable current rating to handle current limit in the
configuration must be used.
where:
D = ----------------
V IN
( V IN – V OUT ) × D D
s OUT
(EQ. 7)
(EQ. 8)
Output Capacitor
The output capacitor acts to smooth the output voltage and
in the boost configuration supplies load current directly
during the conduction phase of the power switch. Ripple
voltage consists of two components, the first due to charging
and discharging of the capacitor; the second due to IR drop
across the ESR of the capacitor by inductor ripple current.
For a low ESR ceramic capacitor, output ripple is dominated
by the charging and discharging of the output capacitor.
Care should be taken to ensure the voltage rating of the
capacitor exceeds the maximum output voltage.
Compensation
The ISL78100 employs a direct summing control loop with
current feedback. No error amplifier is used in the system.
V RIPPLE = ---------------- × ------- + I LPK × ESR
V OUT – V IN
I LPK = ------------- + ------------------------------------ × ------------------
f s
In boost mode:
I O D
C OUT F S
where:
D = --------------------------------
V OUT
and
I O ( V OUT – V IN ) ( 1 – D )
1 – D 2 × L
(EQ. 4)
(EQ. 5)
(EQ. 6)
The arrangement provides fast transient response and
makes use of the output capacitor to compensate the loop.
The effect of the pole associated with the inductor is
minimized by the current feedback. The number of LEDs,
their DC bias current and the value of feedback resistor alter
loop stability due to their effect on feedback factor, which is
heavily influenced by the small signal impedance of the
LEDs. Generally, higher numbers of LEDs, lower bias levels
and smaller values of feedback resistor will require smaller
output capacitors to achieve loop stability. A combination of
low ESR electrolytic and ceramic capacitors may be used to
reduce implementation costs.
TABLE 2. BOOST MODE COMPENSATION. 2.7V 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
94μF
40μF
47μF
20μF
40μF
20μF
20μF
DMAX
DMAX
100mV
100mA
Electrolytic
94μF
Ceramic
60μF
60μF
40μF
40μF
40μF
200mV
350mA
Electrolytic
94μF
47μF
47μF
47μF
ILIM
ILIM
ILIM
Ceramic
60μF
40μF
40μF
40μF
200mV
1A
Electrolytic
ILIM
ILIM
ILIM
ILIM
ILIM
ILIM
ILIM
Ceramic
TABLE 3. BOOST MODE COMPENSATION 6V 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
94μF
47μF
Ceramic
40μF
20μF
40μF
20μF
20μF
20μF
20μF
100mV
100mA
Electrolytic
141μF
47μF
200mV
350mA
Ceramic
Electrolytic
Ceramic
60μF
141μF
60μF
60μF
47μF
60μF
60μF
47μF
40μF
40μF
60μF
40μF
40μF
40μF
40μF
40μF
40μF
200mV
1A
Electrolytic
94μF
47μF
ILIM
ILIM
ILIM
ILIM
ILIM
14
Ceramic
40μF
40μF
FN6626.1
December 24, 2013
相关PDF资料 |
PDF描述 |
|---|---|
| VI-BTW-CX-S | CONVERTER MOD DC/DC 5.5V 75W |
| VI-BTV-CX-S | CONVERTER MOD DC/DC 5.8V 75W |
| VI-BTR-CX-S | CONVERTER MOD DC/DC 7.5V 75W |
| ISL78100ARZ-TK | IC LED DRIVER AUTOMOTIVE 20-QFN |
| VI-BTN-CW-S | CONVERTER MOD DC/DC 18.5V 100W |
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 |
发布紧急采购，3分钟左右您将得到回复。