SANYO STK740-471

Ordering number:EN*6107
Thick Film Hybrid IC
STK740-470
5V/5A Single Output Separate Excitation
Chopper Regulator
Preliminary
Overview
Package Dimensions
The STK740-470 is a separate-excitation step-down
chopper regulator hybrid IC for the secondstage circuit.
This IC incorporates in the package all the necessary
circuits for a chopper regulator including power switch,
error amplifier, soft start, shutdown type output short
protection, low-voltage malfunction prevention, on/off,
and snubber circuits. Therefore, external components
required are input and output capacitors and a choke coil
only and this allows this IC to be used to construct a
large-current (5A) chopper regulator as if a 3-pin regulator were used. DC8V to 18V input voltage can be
handled and up to 5A of output current is supported.
unit:mm
4170-SIP28
[STK740-470]
46.6
8.5
2.54
12
0.5
4.0
1
1.0
12.7
3.6
25.5
41.2
(6.63)
0.4
2.9
11×2.54=27.94
Applications
• Local power supply for the equipment of which input
rating is DC9V to 15V.
SANYO : SIP-28
Features
• Adoption of Sanyo IMST ; Insulated Metal Substrate
Technology, allows the circuit to be operated without
using a heat sink (see “No Fin Output Current Derating” chart in the page 6).
• Typical efficiency of 90% at DC 12V input, 2.5A
output.
• Fine adjustment of output voltage enable.
• 50 kHz operating frequency.
• Low-RON resistance power MOSFET adopted.
• Low-VF Schottky barrier diode adopted.
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
63099RM (KT) No.6107–1/10
STK740-470
Series Construction
This product is listed in a product series due to its property such as output voltage, output current, package, and other
similar items. Since some prducts listed in the table below is under development, please refer to your Sanyo sales
representative for details.
Type number
Package dimensions
(output pins not included)
Input voltage Output voltage Output current
∗
STK740-411
4 to 8V
2.5V
5A
26 × 37 × 4.5mm,12pins
∗
STK740-420
4 to 8V
2.5V
10A
25.5 × 46.6 × 8.5mm,12pins
5A
26 × 37 × 4.5mm,12pins
4 to 8V
3.3V
STK740-450
10A
25.5 × 46.6 × 8.5mm,12pins
STK740-471
5A
26 × 37 × 4.5mm,12pins
5A
25.5 × 46.6 × 8.5mm,12pins
STK740-480
10A
25.5 × 46.6 × 8.5mm,12pins
STK740-490
15A
25.5 × 46.6 × 8.5mm,12pins
STK740-441
STK740-470
8 to 18V
5.0V
* : Under planning
Specifications
Maximum Ratings at Ta = 25˚C, Tc = 25˚C, unless otherwise specified.
Parameter
Operating IC substrate temperature
Operating temperature
Storage temperature
DC input voltage
Symbol
Conditions
Ratings
Tc max
˚C
–10 to +85
˚C
–30 to +115
˚C
20
V
Topr
Tstg
VIN max
Unit
+105
Pins 6, 11, and 12
Recommended Operating Conditions at Ta = 25˚C
Parameter
Symbol
Operating IC substrate temperature
Tc
DC input voltage
VIN
Io
Load current
Conditions
Ratings
Unit
0 to +85
˚C
In the recommended circuit
8 to 16
V
In the recommended circuit
1 to 5
A
Electrical Characteristics at Tc = 25˚C, in the specified circuit, VIN = 12V, IO = 1A, unless othrwise specified
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
Output voltage
Vo
4.9
5.0
5.1
Line regulation
∆VL
VIN=8V to 16V
–
100
–
mV
Load regulation
∆VO
Io=1A to 5A
–
100
–
mV
Io=2.5A
–
90
–
%
45
50
55
kHz
mA
Efficiency
η
Operating frequency
fosc
Cutoff current
ICUT
6pin, latch mode
–
1.6
–
On/off circuit
Voff
1pin
–
0.22
0.32
Tc=+25 to +85˚C
–
±1.7
Output voltage temperature coefficient
TCVO
V
V
– mV/˚C
No.6107–2/10
STK740-470
Block Diagram
TR1
12
VIN
D1
11
Snubber circuit
6
VCC
7
Error amplifier
PWM
5
OUT
A
2
VS
3
VADJ
4
FB
1
ON/OFF
Phase
compensation
Low-voltage
malfunction
prevention circuit
SUB
9
8
Drive circuit
Reference voltage
GND
10
On/off circuit
Soft start circuit
Short protection circuit
Oscillator
Pin Descriptions
Description
Number
Pin name
1
ON/OFF
Remote on/off switching
2
VS
Output voltage sensing
3
VADJ
4
FB
5
GND
Ground
6
VCC
Power supply for control block
7, 8
A
9, 10
OUT
Output
11, 12
VIN
Input supply voltage
Output voltage fine adjustment
Feedback (error amplifier output), phase compensation
Flywheel diode anode
No.6107–3/10
STK740-470
Test Circuit
12 11 10 9
8
7 6
5 4
3
2 1
ON/OFF
Vo adjust
DC
INPUT
L1
C1
FB
C2
GND
GND
C1
C2
L1
FB
OUTPUT
(5V)
: 47µF/25V (OS capacitor)
: 1000µF/16V×2
: 30µH
: Ferrite-bead core
Overvoltage Protection Circuit
In a constant-voltage power supply circuit output voltage may generally exceed the stipulated rating (equivalent to input
voltage) when the circuit is broken down or the IC and the printed circuit board is wrongly soldered. Therefore overvoltage
protection circuit is recommended to use to minimize the damages caused by the overvoltage.
Sample the overvoltage protection circuit
FUSE
Regulator
DC
INPUT
OUTPUT
SCR
GND
C R
GND
No.6107–4/10
STK740-470
Sample Characteristics at Ta = 25˚C, in the test circuit
Output Voltage vs.Output Current
5.4
Output Voltage Vo[V]
5.2
VIN =15V
VIN =12V
5.0
VIN =9V
4.8
4.6
0
1
2
3
Output Current Io[A]
4
5
6
Efficiency vs.Output Current
100
VIN=9V
VIN=12V
VIN=15V
Efficiency η[%]
90
80
70
60
50
0
1
2
3
Output Current Io[A]
4
5
6
No.6107–5/10
STK740-470
Output Voltage vs.Input Voltage
5.4
Io=5A
Output Voltage Vo[V]
5.2
5.0
4.8
4.6
5
10
15
20
Input Voltage V IN[V]
No Fin Output Current Derating
6.0
Output Current Io[A]
5.0
4.0
3.0
2.0
VIN=9V
VIN=12V
1.0
VIN=15V
0.0
-10
0
10
20
30
40
50
60
70
Ambient Temperature Ta[°C]
80
90
100
No.6107–6/10
STK740-470
No Fin ∆Tc vs.Output Current
70
VIN=15V
VIN=12V
60
VIN=9V
∆Tc[deg.]
50
40
30
20
10
0
0
1
2
3
Output Current Io[A]
4
5
6
Power Dissipation vs Output Current
4.0
Power Dissipation PD [W]
VIN=15V
VIN=12V
3.0
VIN=9V
2.0
1.0
0.0
0
1
2
3
Output Current Io[A]
4
5
6
No.6107–7/10
STK740-470
Eveluation Board
The evaluation board is provided to evaluate this hybrid IC
♦ Equivalent Circuit
12 11 10
9
8
7
6
5
3
4
2
1
IC1
ON/OFF
Vs
R2
V IN
Vo
L1
C1
FB1
C2
GND
GND
♦ Parts Table
Part name
Requirements
Number
Manufacturer
Notes
C1
Electrolytic capacitor 47µF/25V
1
Sanyo Electronic component co., ltd.
OS capacitor
C2
Electrolytic capacitor 1000µF/16V
2
Sanyo Electronic component co., ltd.
Low impedance (CG)
R2
Resistor
1
R3
Jumper
1
R6
Jumper
1
Use a fuse resistor (20 to 30Ω) when needed
BL02RN1-R62
1
Murata manufacturing co., ltd.
HK-10S100-4500
1
Toho zinc co., ltd.
FB1 Ferrite-bead core
L1
Choke coil
100Ω
45µH, 5A
♦ Notes on pattern designing
1 Place VCC pin (pin 6) and VIN pins (pin 11 and 12) lines separately and use an input capacitor (+) for connection.
2 Place GND pin (pin 5) and A pin (pins 7 and 8) lines separately.
3 Connect A pin (pins 7 and 8) with the input capacitor (–) through a Ferrite-bead core.
4 Connect GND pin (pin 5) with the input capacitor (–) or the output capacitor (–). However, connect with the
output capacitor (–) unless otherwise specified.
5 Shorten the length of the line between the input capacitor (–) and the output capacitor (–) as well as possible.
6 Connect VS pin (pin 2) with the output capacitor (+).
No.6107–8/10
STK740-470
♦ Perspective Wiring Layout (from soldered side)
R6
CN 3
IC1
C1a
S-GND
ON/OFF
R5 R1R2
FB1
R3
C1b
C4
C5
C6
+Vs
C2c
VIN
+Vo
L1
GND
GND
C1c
CN1
C8
C2a
C2b
C9
CN 2
♦ Circuit Pattern (soldered side)
STK740-400 TEST-B
No.6107–9/10
STK740-470
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be expor ted without obtaining the expor t license from the authorities
concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
This catalog provides information as of June, 1999. Specifications and information herein are subject to
change without notice.
PS No.6107–10/10