MH2501SC/MH2511SC
Precautions
Thank you for purchasing this product.
When using this IC, please follow the warnings and cautions given below to ensure safety.
Warning
Caution
!
!
Improper handling may result in death, serious injury, or major property damage.
Improper handling may result in minor injury or property damage.
Warning
!
This IC is intended for use in general electronic machines, such as business equipment,
communications equipment, measuring instruments, and household appliances. Do not use this IC
in medical devices, aerospace equipment, railway or other transport equipment (e.g., automobiles,
ships), nuclear power control equipment, or any other equipment required to demonstrate mission-
critical reliability or safety, or whose malfunction may directly cause injuries or endanger human
life. Contact us before using the product for any applications other than general electronic
machines.
Never attempt to repair or modify the product. Doing so may lead to serious accidents.
<<Electric shock, destruction of property, fire, or malfunctions may result.>>
In the event of a problem, an excessive voltage may arise at an output terminal, or the voltage may
drop. Anticipate these fluctuations and any consequential malfunctions or destruction and provide
adequate protection for equipment, such as overvoltage or overcurrent protection.
Check the polarity of the input and output terminals. Make sure they are properly connected before
turning on power.
<<Failure to do so may lead to failure of the protective element or generate smoke or fire.>>
Use only the specified input voltage. Deploy a protective element on the input line.
<<Problems may result in smoke or fire.>>
In the event of a malfunction or other anomaly, shut power off and contact us immediately.
!
!
Caution
!
!
!
The contents of this document are subject to change without notice.
Use of this product constitutes acceptance of the formal specifications.
We have taken every possible measure to ensure the accuracy of the information in this document. However, we
will not be held liable for any losses or damages incurred or infringements of patents or other rights resulting
from use of this information.
This document does not guarantee or license the execution of patent rights, intellectual property rights or any other
rights of Shindengen or third parties.
No part of this document may be reproduced in any form without prior consent from Shindengen.
We strive at all times to improve the quality and reliability of our products. However, a certain risk of
malfunctions is inevitable with semiconductor products. You are responsible for producing a design that meets
safety requirements (whether a redundant design, a design that prevents the spread of fire, or designs that
minimize the possibility of malfunctions) necessary to avoid injury, fire, or damage to social credibility that may
result should any of our products malfunction.
!
The semiconductor product described in this document is not designed or manufactured for use in a device or
a system required to demonstrate mission-critical reliability or safety, or whose malfunction may directly cause
injuries or endanger human life. Contact us before using the product for any of the following special or specific
applications:
!
Special applications
Transport equipment (e.g., automobiles and ships), communications equipment for a backbone network, traffic
signal equipment, disaster or crime prevention equipment, medical devices, various types of safety equipment,
and other applications
Specific applications
Nuclear power control systems, aircraft equipment, aerospace equipment, submarine repeaters, medical
equipment used in life-support, and other applications
Even if the equipment is not designed for a special or specific application, please consult with us before using
any of our IC products in equipment required to run continuously for extended periods.
!
We provide support for circuit design to ensure safe use of our IC products. Please contact one of
our sales representatives or our product marketing department if you have any questions.
SHINDENGEN
ELECTRIC MFG.CO.,LTD
-2-
Index
1 : Outline
1.1: Features
1.2: Block diagram
1.3: Pin arrangement diagram
1.4: Pin function list
5
5
6
6
For Master IC and/
or Slave IC
2 : Operating principles
2.1： Operating principles of current-critical PFC with
ON range control
2.2: Zero current detection
2.3: Interleaving
2.4: Startup and shutdown sequences
2.5: Output voltage control
2.6: Phase compensation
2.7: Gate driver
2.8: Protection functions
2.8.1: Overcurrent protection
2.8.2: Output overvoltage protection (OVP)
2.8.3: Low input voltage protection and FB pin
open/short protection
2.8.4: Output diode short protection
2.8.5: VCC pin undervoltage protection (UVLO)
2.8.6: Thermal shutdown
2.9：Application circuit
2.9.1: Slave stop protection
2.9.2: Remote ON/OFF
2.9.3: Switching the number of phases
2.10: Example of operation waveforms
7
Master
8
9-10
11
12
13
13
14
14-15
15
16
16
16
17-18
18
19
20
Master
Master
Slave
Slave
Master
Master
Master
Slave
Master
Master
Slave
Slave
Master
Master
Master
Slave
Master
3 : Circuit example
3.1: Typical circuit diagram
21
4 : Determining peripheral circuit constants
4.1: Selecting choke coils
4.2: Selecting the MOSFET
4.3: Selecting an output diode
4.4: Selecting a bypass diode
4.5: Adjusting constants for components around Z/C
pin
4.6: Adjusting phase compensation
4.7: Adjusting the output voltage
4.8: Adjusting the overcurrent protection point
4.9: Selecting the output capacitor
22
23
23
23
24
25
25
26
26
SHINDENGEN
ELECTRIC MFG.CO.,LTD
-3-
1
Outline
MH2501SC (“master IC” hereinafter) and MH2511SC (“slave IC” hereinafter) comprise ICs for a
current-critical interleaved PFC circuit. Interleaving with master and slave ICs ensures low noise
and high efficiency, which are characteristics of current-critical PFCs, even in high power regions.
One-phase PFC can be configured using just the master IC.
1.1
1.
2.
3.
4.
5.
Features
High efficiency and low noise via master-slave interleaved critical current mode
Two or greater phase interleaving achieved by connecting slave ICs in parallel
One-phase PFC configurable using just the master IC
Support for wide range of input voltages with guaranteed VCC withstand voltage of 26 V
Variety of protective functions
(overvoltage protection, overcurrent protection, feedback open/short protection, and output
diode short protection)
1.2
Block diagram
Fig. 1 Master IC (MH2501SC) block diagram
Master_ON
Counter_F/F
S Q
ON/OFF_F/F
S Q
R
Q
2
IL_OUT
IL_IN
1
IL_IN
EDGE OUT
Master_ON
Timer_F/F
S Q
R
Q
R
Q
Phase
Shifter
Master_ON
Timer 50us
Vcc
7
DRIVER
OUT
LATCH
3
Slave_Stop1_F/F
Q S
Q
R
Vcc_UVLO
8
VCC
TIMER
5
-
+
TIMER
Slave_Stop2_F/F
Q S
GND
6
Q
R
+
-
OCL
4
OCL
Fig. 2 Slave IC (MH2511SC) block diagram
SHINDENGEN
ELECTRIC MFG.CO.,LTD
-5-
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