SI-8050JF [ALLEGRO]
Step-Down to 5.0 V, 1.5 A, DC/DC Converter; 降压至5.0 V ， 1.5 A ， DC / DC转换器
| 型号： | SI-8050JF |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Step-Down to 5.0 V, 1.5 A, DC/DC Converter |
| 文件： | 总9页 (文件大小：329K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SI-8050JF
Step-Down to 5.0 V, 1.5 A, DC/DC Converter
Designed to meet high-current requirements at high efficiency in
industrial and consumer applications; embedded core, memory, or logic
supplies; TVs, VCRs, and office or telecommunications equipment, the
SI-8050JF dc/dc step-down (buck) converter offers a constant 125 kHz
switching frequency essential for low EMI noise. The npn switch is
included on the die along with the oscillator, control, and logic circuitry
requiring only four external components for a regulated 5.0 V output at
up to 1.5 A.
A wide input voltage range and integrated thermal and overcurrent
protection enhance overall system reliability. Reference accuracy and
excellent temperature characteristics are provided. An output-enable
input gives the designer complete control over power up, standby, or
powerdown.
This device is supplied in a fully molded TO-220-style 5-lead
flange-mounted , high power, isolated plastic package. A similar device
in a lower-power surface-mount plastic package is the SI-8050JD.
FEATURES
■ 7 V to 40 V Input Range
■ 1.5 A Output Current at 5.0 V
■ 2% Output Voltage Tolerance
■ Foldback Current Limiting
■ Constant 125 kHz Switching Frequency
■ 200 µA Maximum Standby Current
■ Soft Start Prevents Supply Voltage Dip
■ RemoteVoltageSensing
■ ThermalProtection
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . 43 V
Output Current, IO . . . . . . . . . . . 1.5 A*
Enable Input Voltage, VOE . . . . . . . . . . . 6 V
Junction Temperature, TJ . . . . +125°C
APPLICATIONS
■ TVs, VCRs, Electronic Games
■ Embedded Core, Memory, or Logic Supplies
■ Printers and Other Office Equipment
■ Industrial Machinery
Storage Temperature Range,
■ TelecommunicationsEquipment
TS . . . . . . . . . . . . -40°C to +125°C
* Output current rating is limited by input
voltage, duty cycle, and ambient tempera-
ture. Under any set of conditions, do not
exceed a junction temperature of +125°C.
Always order by complete part number, e.g., SI-8050JF .
Sanken Power Devices
from Allegro MicroSystems
SI-8050JF
Step-Down
to 5.0 V, 1.5 A,
DC/DC Converter
FUNCTIONAL BLOCK DIAGRAM
Allowable Package Power Dissipation
Recommended Operating Conditions
Min
Max Units
DC Input Voltage (IO ≤ 1 A)
(IO ≤ 1.5 A)
7
8
8
40
V
V
DC Output Current (VI ≥ 6.3 V)
Operating Junction Temp.
0
1.5
A
-30
+125
°C
For the availability of parts meeting -40°C require-
ments, contact Allegro’s Sales Representative.
This data sheet is based on Sanken data sheet SSJ-02162
115NortheastCutoff, Box15036
Worcester,Massachusetts01615-0036
2
Copyright © 2004, 2005 Allegro MicroSystems, Inc.
SI-8050JF
Step-Down
to 5.0 V, 1.5 A,
DC/DC Converter
ELECTRICAL CHARACTERISTICS at TA = +25°C, VI = 20 V, IO = 0.5 A (unless otherwise noted).
Limits
Characteristic
Symbol Test Conditions
Min.
Typ. Max.
5.00 5.10
Units
Output Voltage
VO
4.90
—
V
mV/°C
A
Ref. Volt. Temp. Coeff.
Output Short-Circuit Current
Efficiency
aVref
±0.5
—
—
—
IOM
See note
1.6
—
η
f
82
—
%
Operating Frequency
Line Regulation
—
125
40
—
kHz
mV
mV
mA
µA
∆VO(∆VI)
∆VO(∆IO)
IIQ
VI = 10 V ~ 30 V, IO = 0.5 A
VI = 20 V, IO = 0.2 A ~ 0.8 A
IO = 0 A
—
100
40
Load Regulation
—
10
Quiescent Current
—
7.0
—
—
VCE = 0.3 V
—
200
0.5
-100
Chip Enable Voltage
Soft-Start Current
VCE
ISS
Converter turn-off voltage
VSS = 0 V
—
—
V
—
—
µA
Typical values are given for circuit design information only.
Note: Output short-circuit current is at point where output voltage has decreased 5% below VO(nom)
.
Test Circuit
SI-8050JF
C1 = 220 µF/50 V
C2 = 470 µF/25 V
C3 = 0.47 µF/10 V
L1 = 100 µH
D1 = Sanken RK-16
www.allegromicro.com
3
SI-8050JF
Step-Down
to 5.0 V, 1.5 A,
DC/DC Converter
TYPICAL CHARACTERISTICS
(TA = 25°C)
ꢀ Efficiency
ꢀ Overcurrent Protection
ꢀ Low-Voltage Behavior
ꢀ Load Regulation
ꢀ Temperature Stability
115NortheastCutoff, Box15036
Worcester,Massachusetts01615-0036
4
SI-8050JF
Step-Down
to 5.0 V, 1.5 A,
DC/DC Converter
APPLICATIONS INFORMATION
Input Capacitor (C1). Capacitors with low impedance
for high-frequency ripple current must be used.
Soft-Start Capacitor (C3). Soft start for the converter
is enabled by connecting a capacitor between terminal 5
and ground. The converter may be turned off by decreasing
the terminal 5 voltage below 0.5 V with either an npn
small-signal transistor or the output of open-collector TTL.
If both a large soft-start capacitor and on/off control are
desired, collector current limiting must be used to prevent
transistor damage. No external voltage can be applied to
terminal 5.
Output Capacitor (C2). Capacitors with low impedance
for high-frequency ripple current must be used. Especially
when the C2 impedance is high, the switching waveform
may not be normal at low temperatures. Film or tantalum
capacitor for C2 may cause abnormal oscillations.
Catch Diode (D1). Diode D1 must be a Schottky diode.
Other diode types will result in increased forward voltage
spikes, reverse current flow, increased IC power dissipa-
tion during the off period, and possible destruction of the
IC.
Choke Coil (L1). If the winding resistance of the choke
coil is too high, the circuit efficiency will decrease. As the
overcurrent protection start current is approximately 2.5 A,
attention must be paid to the heating of the coil by magnetic
saturation due to overload. To reduce the output ripple, the
inductor may be increased at the expense of excessive
board area and cost.
Parallel Operation. Parallel operation to increase load
current is not permitted.
Overcurrent Protection. The SI-8000JF series has a
built-in fold-back type overcurrent protection circuit, which
limits the output current at a start-up mode. It thus cannot
be used in applications that require current at the start-up
mode such as:
(1) constant-current load,
(2) power supply with positive and negative outputs to
common load (a center-tap type power supply), or
(3) raising the output voltage by putting a diode or a
resistor between the device ground and system ground.
SI-8050JF
Typical Application
www.allegromicro.com
5
SI-8050JF
Step-Down
to 5.0 V, 1.5 A,
DC/DC Converter
APPLICATIONS INFORMATION (cont.)
Thermal Protection. Circuitry turns off the switching
transistor when the junction temperature rises above 150°C.
It is intended only to protect the device from failures due to
excessive junction temperatures and should not imply that
output short circuits or continuous overloads are permitted.
Heat Radiation and Reliability. The reliability of the
IC is directly related to the junction temperature (TJ) in its
operation. Accordingly, careful consideration should be
given to heat dissipation. The graph on page 2 illustrates
the effect of thermal resistance on the allowable package
powerdissipation.
When mounting to a heat sink, apply silicone grease (Shin-
Etsu Chemical G746, Dow Corning Toray Silicone SC102,
or Toshiba Silicone SY6260). Recommended mounting
hardware torque: 0.588 ~ 0.686 Nm or 6.0 ~ 7.0 kgf•cm
(4.34 ~ 5.06 lbf•ft).
Layout Guideline
The junction temperature (TJ) can be determined from
either of the following equations:
TJ = (PDRθJA) + TA
or
TJ = (PDRθJC) + TC
where PD = VIII – VOIO – VFIO(1 – [VO/VI])
or the adjacent graph,
VF = the Schottky diode forward voltage, and
RθJC = 6°C/W.
115NortheastCutoff, Box15036
Worcester,Massachusetts01615-0036
6
SI-8050JF
Step-Down
to 5.0 V, 1.5 A,
DC/DC Converter
Dimensions in Millimeters
Terminal Finish: Sn–3Ag–0.5Cu, 2nd level interconnect category (e1)
Product Weight: Approx. 2.3 g
Terminal spacing is measured at lead tips.
www.allegromicro.com
7
SI-8050JF
Step-Down
to 5.0 V, 1.5 A,
DC/DC Converter
Shipping Container Dimensions in Millimeters
Primary Packing: 50 pieces per stick
Product Thickness: 0.7 mm ±0.3 mm
Material: Hard polyvinylchloride (transparent)
Warp: Within 2 mm against L-shape dimension
Secondary Packing: Ten sticks, four layers (2000 pieces
per box). Cardboard box.
Inner Cover
Stick
Shock-Absorbing
Stick
Material (50-100 mm)
Underlay
115NortheastCutoff, Box15036
Worcester,Massachusetts01615-0036
8
SI-8050JF
Step-Down
to 5.0 V, 1.5 A,
DC/DC Converter
The products described herein are manufactured in Japan by Sanken
Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.
Sanken and Allegro reserve the right to make, from time to time, such
departures from the detail specifications as may be required to permit
improvements in the performance, reliability, or manufacturability of its
products. Therefore, the user is cautioned to verify that the information
in this publication is current before placing any order.
When using the products described herein, the applicability and
suitability of such products for the intended purpose shall be reviewed at
the users responsibility.
Although Sanken undertakes to enhance the quality and reliability of
its products, the occurrence of failure and defect of semiconductor
products at a certain rate is inevitable.
Users of Sanken products are requested to take, at their own risk,
preventative measures including safety design of the equipment or
systems against any possible injury, death, fires or damages to society
due to device failure or malfunction.
Sanken products listed in this publication are designed and intended
for use as components in general-purpose electronic equipment or
apparatus (home appliances, office equipment, telecommunication
equipment, measuring equipment, etc.). Their use in any application
requiring radiation hardness assurance (e.g., aerospace equipment) is
not supported.
When considering the use of Sanken products in applications where
higher reliability is required (transportation equipment and its control
systems or equipment, fire- or burglar-alarm systems, various safety
devices, etc.), contact a company sales representative to discuss and
obtain written confirmation of your specifications.
The use of Sanken products without the written consent of Sanken in
applications where extremely high reliability is required (aerospace
equipment, nuclear power-control stations, life-support systems, etc.) is
strictly prohibited.
The information included herein is believed to be accurate and
reliable. Application and operation examples described in this publica-
tion are given for reference only and Sanken and Allegro assume no
responsibility for any infringement of industrial property rights,
intellectual property rights, or any other rights of Sanken or Allegro or
any third party that may result from its use.
EI16EI
9
www.allegromicro.com
相关型号：
©2020 ICPDF网 联系我们和版权申明