IN-PLUG
®
IPS15 Datasheet
–
Rev.12
- Low cost, High Efficiency, Low Power off-line Switcher
IN-PLUG
®
series: IPS15
Low Cost, High Efficiency, Low Power
Enhanced Off-line Switcher
– REVISION 12 -
INTRODUCTION
DESCRIPTION
The IN-PLUG
®
IPS15 is an enhanced off-line
switcher version of the IPS10. It includes additional
features such as soft start and over-voltage limiting.
As the IPS10, the IPS15 Integrated Circuit was
especially designed for low-cost, high efficiency, low-
power fly-back off-line switching power supplies up
to approximately 50 to 70W. It contains a shunt-
regulator, a precision oscillator, a PWM with its
associated comparator and loop compensation
components as well as all the necessary biasing and
protection circuitry (thermal shutdown, under-voltage,
over-voltage and over-current).
It is optimized to operate with an optocoupler to
provide the feedback from the secondary but can also
be used with a bias winding which could sometimes
be more economical.
Typical applications include domestic and
international power supplies featuring AC input
ranging from 90 to 264V and DC from 100 to 350V.
In addition to being a low-cost IC, the IPS15 allows
further cost reduction for the complete power supply
thanks to:
- fewer and cheaper associated components
- a simpler, cheaper and more forgiving fly-back
transformer.
For very low power applications the IPS15 can be
powered from the rectified AC through a simple
resistor.
For higher power applications, the IPS15 is powered
through a novel patented network which replaces the
usual snubber network. AAI will grant one non-
exclusive royalty free licence to use this arrangement
for each IPS15 purchased by Customers, either
directly from the company or through approved
sources.
The IN-PLUG
®
IPS15 can drive a large variety of
power MOSFETs hence providing the maximum
flexibility at the lowest possible cost.
FEATURES
•
Lowest cost solution for low-power off-line
flyback applications.
•
High performance yet forgiving.
•
Simple, less critical, lower cost transformer.
•
Wide range PWM for stable operation at any load
and line voltage.
•
Suitable for constant-power applications.
•
Operates with optocoupler or bias winding for
constant voltage applications: zeners, adjustable
shunt regulator like TL431 or dedicated feedback
controllers like AAI precision IPS22 & IPS25.
•
EMI reduction in critical applications thanks to:
Adjustable operating frequency.
Separate MOSFET N & P drives
•
Power shut-down for stand-by modes.
•
Cycle to cycle over-current protection
•
Under-voltage and over-voltage protection.
•
External component savings: MOV, X-cap, Y-cap
(ESD/lightning permitting)
APPLICATIONS
•
Standby power supplies for TV, VCR and IR
remotely-controlled appliances.
•
Cordless and feature phones.
•
Cellular phone chargers.
•
Power tools fast chargers with trickle and on/off.
•
Laptops and personal digital assistants.
•
Utility meters.
•
Replacements for bulky plug-in transformers.
PIN CONFIGURATION:
PDRIVE
ISENSE
VCC
RBIAS
4
1
DIP-8 / SOIC-8
8
NDRIVE
GND
IPS15
5
OPTO
OVERV
©
Copyright 2003-2007 - ASIC Advantage, Inc. – All rights reserved
- Revision 12 – April 02, 2007
1 / 15
IN-PLUG
®
IPS15 Datasheet
–
Rev.12
- Low cost, High Efficiency, Low Power off-line Switcher
FUNCTIONAL BLOCK DIAGRAM
VCC
OPTO
OVERV
PDRIVE
OVER
VOLTAGE
LOCKOUT
UNDER
VOLTAGE
LOCKOUT
THERMAL
SHUTDOWN
_
REF1
SHUNT
REF2
FILTERS
PWM
+
COMPARATORS
ENB
VCC
_
R
REGULATOR
Q
Bandgap
reference
+
REF3
SOFT START
CURRENT
LIMITING
S
GND
OSCILLATOR
ENB
GND
RBIAS
ISENSE
NDRIVE
TYPICAL APPLICATION SCHEMATIC:
AC IN 110V, 5W OUTPUT, zener regulation (EMC components not
shown).
TR1
Patented
Snubber Network
D1
Schottky
5A - 60V
L1
4.2 uH
OUT+
110V AC
C4
100pF
1KV
820k
TRANSF-1P1S
LP=1.5mH, LS=1.5microH
R2
Q1
NMOSFET
1A, 600V
R6
4.3k
1.5k
4
R3
R7
10Meg
1/4W
Zener
9.2V
C5
470uF
16V
470
D2
1/2W 1N4148
1
U1
1
2
3
4
PDRV NDRV
ISENSE GND
VCC OPTO
RBIAS OVRV
IPS15
8
7
6
5
D4
3
BR1
BRIDGE
2
U2
D3
C1
10uF
250V
C3
22uF
16V
Figure 1
©
Copyright 2003-2007 - ASIC Advantage, Inc. – All rights reserved
+
1N4148
R4
1.2
R5
330k
PrimaryGND
C2
220pF
R8
100k
OPTO-NPN
SecondaryGND
- Revision 12 – April 02, 2007
+
+
R1
R1A
100
C6
220uF
16V
+
OUT-
2 / 15
IN-PLUG
®
IPS15 Datasheet
–
Rev.12
- Low cost, High Efficiency, Low Power off-line Switcher
PIN DESCRIPTION
Number
1
2
3
4
5
6
7
8
Name
PDRIVE
I
SENSE
V
CC
R
BIAS
OVERV
OPTO
GND
NDRIVE
Description
Internal P drive terminal to be connected to the gate of the outside power
MOSFET. (The rising edge can be adjusted with an external resistor)
MOSFET current sensing. Any voltage over 700 mv @ 25°C on this pin
will stop gate pulses.
IC positive supply. The chip behaves like a 9.5 volts zener diode.
External R
BIAS
connection to set the operating frequency.
Over-voltage lock-out pin. @ 25°C a voltage over 4V on this pin will pull
the MOSFET gate to GND.
Feedback input
Ground
Internal N drive terminal to be connected to the gate of the outside power
MOSFET. (The falling edge can be adjusted with an external resistor)
IN-PLUG
®
IPS15 SERIES FUNCTIONAL DESCRIPTION
The
IPS15
is a PWM controller for fly-back switching power supply applications. It has been optimized to reduce
the external component count. The principal features are:
- Low start Current.
- Shunt regulator to allow the maximum flexibility to power the chip.
- Protections against overheating, under-voltage and over-voltage.
- Precise oscillator with externally adjustable frequency.
- On-chip filters for the loop compensation and the over-current sensing.
- Soft start and over-voltage shut-down to protect the MOSFET.
- Separate MOSFET P and N drivers to adjust rising and falling edge independently.
The shunt regulator operates like a zener diode, keeping the chip supply voltage around 9.5 volts. At start-up the
chip stays in stand-by mode until the voltage of VCC reaches about 9.5 volts. During this phase, the consumption is
of the order of 120
μA.
When the 9.5 volts are reached, the driver starts providing gate pulses. The chip will go back
to the stand-by mode if the supply voltage decreases down to ~8 volts. The overall chip consumption in normal
operation is about 600
μA,
not counting the current required to drive the MOSFET gate.
For domestic application, the chip can be supplied from the rectified line voltage through a resistor. In such case, the
resistor has to be sized to drive enough current to the chip.
For international applications, the IC gets the start current from a resistor connected to the rectified line voltage
(~150
μA)
then, after the first gate pulse, the patented modified snubber network (*) provides the additional current
to keep the chip running.
The opto pin is pulled to VCC through an internal resistor, allowing a maximal duty cycle of 60 %. During start-
up, the duty cycle is controlled by the internal soft start unit which smoothly increases the MOSFET current up to its
maximum, corresponding to 700mV developped across the sense resistor.
When the expected output voltage is reached, the optocoupler's led is driven, and the opto pin voltage decreases,
reducing the duty cycle to a controlled value. The current limiting protection operates by turning-off the MOSFET
when the ISENSE pin voltage exceeds ~700 mv. This ensures a cycle to cycle protection of the MOSFET and
provides a mean of operating the power supply in constant-power mode.
The voltage limiting protection operates by turning-off the MOSFET when the OVERV pin voltage exceeds 4V.
(*)
US Patent # 6,233,165 -
Royalty free licence for IN-PLUG
®
Customers.
©
Copyright 2003-2007 - ASIC Advantage, Inc. – All rights reserved
- Revision 12 – April 02, 2007
3 / 15
IN-PLUG
®
IPS15 Datasheet
–
Rev.12
- Low cost, High Efficiency, Low Power off-line Switcher
AC 110V- IPS15 operations at medium load (5W)
*
IPS15 operations at heavy load (15W)*
Vout
Vout
Isense
Isense
Drain
Drain
AC 250V - IPS15 operations at medium load (5W)*
IPS15 operations at heavy load (15W)*
Vout
Vout
Isense
Isense
Drain
Drain
*
Together with a 1A, 600V MOSFET.
OUTPUT POWER CAPABILITY
Part Number
IPS15
Package
DIP-8 / SOIC-8
230V AC or 115V AC w/ Doubler
Up to 70W (1)
85 – 285V AC
Up to 30W (1)
Note (1): Governed by size and package of external MOSFET
©
Copyright 2003-2007 - ASIC Advantage, Inc. – All rights reserved
- Revision 12 – April 02, 2007
4 / 15
IN-PLUG
®
IPS15 Datasheet
–
Rev.12
- Low cost, High Efficiency, Low Power off-line Switcher
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATING
Characteristics
Shunt regulator max I
CC
(pin 3) - see fig 4-
All analog inputs (pin 2, 4, 5, 6)
Peak drive output current (pin1)
Junction to case thermal resistance R
θJ-C
Junction to PCB thermal resistance R
θJ-A
Power dissipation for T
A
<= 70°C
Operating junction temperature
Storage temperature range
Lead temperature (3 mm from case for 5 sec.)
PARAMETER
TEST CONDITIONS
@ 25°C unless specified
MIN.
Value
50
Min= -0.3, Max= +6.3V
Source=100, Sink=170
PDIL = 42, SOIC = 45
PDIL = 125, SOIC =155
PDIL = 640, SOIC = 500
- 40 to 150
- 55 to 150
260
PARAMETERS
TYP.
MAX.
UNITS
°C
°C / W
mW
UNITS
mA
V
mA
Supply, bias & circuit protection
Shunt regulator voltage
Shunt regulator dynamic
resistance (see Fig. 4)
Shunt regulator max peak
repetitive current
Min I
CC
to start oscillator
Under voltage lock-out
Min I
CC
to ensure continuous
operation
Current limiting sensing
voltage
Temperature coefficient of
current limiting
Overvoltage sensing voltage
Soft/start duration
Leading edge blanking
Thermal shutdown trip
temperature
0 to 700mV
1A, 600V, 5 nC MOSFET
ICC = 1 to 30 mA
1 to 30 mA
9.2
2
-
-
V
CC
– 2.2
1.1
@ 20KHz
9.7
3
35
-
V
CC
- 1.5
3.2
@
80KHz
10.5
5
-
140
V
CC
- 1.4
4.9
@ 150KHz
V
Ω
mA
μΑ
V
mA
655
-
3.85
-
200
-
700
-
4
20
-
150
745
50
4.15
-
450
-
mV
μV/°C
V
clock cycles
ns
°C
Oscillator & PWM
Range of operating
frequencies
RBIAS values for above
frequencies (see figure 2)
Oscillator stability with
supply & temperature
(see figure 3 for average)
Maximum duty cycle
Minimum duty cycle
30
550
I
CC
= 5 mA
Temp = 0 to 70°C
-1.5
-
-
80
170
-
66
0
150
80
1.5
-
-
KHz
KΩ
%
%
%
©
Copyright 2003-2007 - ASIC Advantage, Inc. – All rights reserved
- Revision 12 – April 02, 2007
5 / 15
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