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参数资料
| 型号： | SIP12506DMP-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.6A MLP33-6 |
| 标准包装： | 3,000 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 20V |
| 输入电压： | 2.6 V ~ 9 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.6A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | PowerPAK? MLP33-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | PowerPAK? MLP33-6 |
SiP12506
Vishay Siliconix
Product is End of Life 3/2014
I PEAK = I L(avg) +
I
p -p
2
, I L(avg) =
I OUT
1 - D
START UP AND SOFT-START:
When voltage is applied to the V IN pin, the undervoltage lock-
out (UVLO) circuit prevents the controller's output switch and
This peak current varies with inductance tolerance and other
errors, and the rated saturation level varies over tempera-
ture. So a sufficient design margin is required when choosing
current ratings.
A high-frequency core material, such as ferrite, should be
chosen, the core loss could lead to serious efficiency penal-
ties. The DCR should be kept as low as possible to reduce
conduction losses.
LAYOUT CONSIDERATIONS:
In high frequency switching regulators such as the
SiP12506, great attention must be given to the layout pro-
cess in order to ensure stable operation and minimize noise.
Since most power traces in step up converters carry pulsat-
ing current, energy stored in trace inductance during the
pulse can cause high-frequency ringing with input and output
capacitors. This effect can generally be curbed by minimizing
oscillator circuit from turning on until the voltage on the V IN
pin exceeds 2.4 V. Provided the V IN pin is above this thresh-
old, when SHD pin is raised high, soft-start is initiated. Soft-
start is achieved by slowly ramping up the internal reference.
Once the soft-start time has elapsed, SiP12506 enters into a
normal state of operation. The converter then operates con-
tinuously unless the voltage on V IN drops below 2.4 V or SHD
is set low. UVLO hysteresis prevents the converter from
dropping in and out of start-up, unintentionally locking up the
system.
LED CURRENT CONTROL:
The SiP12506 is a white LED driver. The low feedback volt-
age of 0.208 V is designed to reduce losses outside of the
white LEDs and thus improve overall circuit efficiency. The
LED current is set by the small sense resistor on FB and can
be calculated using the following expression:
the length and increasing the width of power traces.
To minimize stray capacitance and even more importantly,
parasitic trace inductance, all components must be kept as
I LED =
V ref
R FB
=
0 . 20 8 V
R FB
close to the switcher as possible. Of special importance, is
the path between the switching node LX, D1, C2, and ground
of the regulator; the length of this path must be kept as small
as possible since any parasitic inductance in series with the
diode and output capacitance will increase noise and pro-
duce ringing in the circuit.
Pulsating currents in the ground trace can cause voltage
In order to have accurate LED current, use of 1 % precision
resistor is recommended.
As shown in Figures 6 and 7, the SiP12506 can be used to
drive four LEDs in series or to drive parallel strings of LEDs.
MBR0530
drops due to trace resistance and cause ground bounce. For
this reason, it is strongly recommended to use a separate
ground plane. V Bias should be used at the negative ends of
V IN
1 μF
2
V IN
L
10 μH
C OUT
1 μF
V OUT
capacitors C3 and C2 as well as the device GND pin to con-
nect to the ground the plane.
The feedback components (R1, R2) should be kept close to
the FB pin and the trace connecting the negative end of R2
to ground should be kept thin in order to minimize noise injec-
SHD
3
5
SHD
SiP12506
VOUT
GND
LX
FB
1
4
0. 208 V
tion into the feedback pin. As an example, Figure 5 demon-
strates a recommended layout of components. It is urged
6
10.5 Ω
that this layout be followed closely as possible to obtain best
performance.
Figure 6. SiP12506 Driving Four LEDs
MBR0530
V IN
1 μF
SHD
3
SHD
2
V IN
L
10 μH
LX
1
C OUT
1 μF
V OUT
SiP12506
5
V OUT
GND
6
FB
4
0. 208 V
10.5 Ω
10.5 Ω
Figure 7. SiP12506 Driving Six LEDs
Figure 5.
www.vishay.com
8
Document Number: 73861
S-70547–Rev. D, 26-Mar-07
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相关代理商/技术参数 |
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| SIP12506DMP-TI-E3 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:1-MHz Boost Converter with OVP for White LED Applications |
| SIP12510DT-T1-E3 | 功能描述:LED照明驱动器 1.25Mhz Boost Cnvrtr White Led Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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