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参数资料
| 型号： | ISL97634IRT18Z-TK |
| 厂商： | Intersil |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 8-TDFN |
| 标准包装： | 1,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.3MHz ~ 1.6MHz |
| 电源电压： | 2.4 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN（2x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
ISL97634
may be beneficial enough that it outweighs the disadvantage of
adding additional component cost. L 1 and L 2 can be a coupled
inductor in one package.
diode if the output voltage is low. The L 2 series resistance also
contributes additional loss. Figure 20 shows the efficiency
measurement of a single LED application as the input varies
between 2.7V and 4.2V.
C1
L2
V IN = 2.7V TO 5.5V 1 L1 2
22μH
1μF
V A
C3
1μF
V B D0
C4
22μH
0.22μF
D1
Note V B is considered the level-shifted LX node of a standard boost
regulator. The higher the input voltage, the lower the V B voltage
will be during PWM on period. The result is that the efficiency will
be lower at higher input voltages because the SEPIC has to work
VIN
LX
harder to boost up to the required level. This behavior is the
C2
0.1μF
VOUT
ISL97634
FBSW
FB
opposite to the standard boost regulator’s and the comparison is
shown in Figure 20.
SDIN
GND
R1
1 Ω
76
V IN = 2.7V
FIGURE 19. SEPIC LED DRIVER
72
V IN = 4.2V
The simplest way to understand SEPIC topology is to think about it
as a boost regulator where the input voltage is level shifted
68
1 LED
downward at the same magnitude and the lowest reference level
starts at -V IN rather than 0V.
The SEPIC works as follows; assume the circuit in Figure 19
operates normally when the ISL97634 internal switch opens and it
64
60
0
5
10
L 1 = L 2 = 22μH
C 3 = 1μF
R 1 = 4.7 Ω
15
20
is in the PWM off state. After a short duration where few LC time
constants elapsed, the circuit is considered in the steady-state
within the PWM off period that L 1 and L 2 are shorted. V B is
therefore shorted to the ground and C 3 is charged to V IN with
V A = V IN . When the ISL97634 internal switch closes and the circuit
is in the PWM on-state, V A is now pulled to ground. Since the
voltage in C 3 cannot be changed instantaneously, V B is shifted
downward and becomes -V IN . The next cycle when the ISL97634
switch opens, V B boosts up to the targeted output like the
standard boost regulator operation, except the lowest reference
point is at -V IN . The output is approximated in Equation 9:
ILED (mA)
FIGURE 20. EFFICIENCY MEASUREMENT OF A SINGLE LED SEPIC
DRIVER
PCB Layout Considerations
The layout is very important for the converter to function properly.
R SET must be located as close as possible to the FB and GND pins.
Longer traces to the LEDs are acceptable. Similarly, the supply
decoupling cap and the output filter cap should be as close as
possible to the VIN and VOUT pins.
The heat of the IC is mainly dissipated through the thermal pad of
V OUT = V IN ------------------
D
( 1 – D )
(EQ. 9)
the package. Maximizing the copper area connected to this pad if
possible and connect to ground plane on the PCB. Connect all vias to
where D is the on-time of the PWM duty cycle.
The convenience of SEPIC comes with some trade-off in addition
to the additional L and C costs. The efficiency is usually lowered
the correct voltage potential (power plane) indicated in the
datasheet. In addition, a solid ground plane is always helpful for the
EMI performance.
because of the relatively large efficiency loss through the Schottky
For additional products, see www.intersil.com/product_tree
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
10
FN6264.4
August 27, 2013
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相关代理商/技术参数 |
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| ISL97634IRT26Z-T | 功能描述:IC LED DRIVR WHITE BCKLGT 8-TDFN 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 |
| ISL97634IRT26Z-TK | 功能描述:IC LED DRIVR WHITE BCKLGT 8-TDFN 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 |
| ISL97635AIRZ | 功能描述:IC LED DRVR WHT/RGB BCKLGT 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
| ISL97635AIRZ-T | 功能描述:IC LED DRVR WHT/RGB BCKLGT 24QFN 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 |
| ISL97635AIRZ-TK | 功能描述:IC LED DRVR WHT/RGB BCKLGT 24QFN 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 |
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