AIC1686
Off-Line Power Supply Protection IC with Shunt
Regulator
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
www.analog.com.tw
DS-1686-00
TEL: 886-3-5772500
FAX: 886-3-5772510
1
FEATURES
Overvoltage Protection for 3.3V, 5V, and 12V
Outputs.
Power Good Signal for 5V Output.
Remote ON/OFF Input.
Uncommitted Protection Input.
5V Regulator with 25mA Source Current.
2.5V Precision Shunt Regulator.
8V to 16V Operation.
Low Power Consumption.
APPLICATIONS
PC Off-Line Power Management.
DESCRIPTION
The AIC1686 is a supervisory and protection IC
intended for use in off-line, multiple output
power supplies. It consists of protection circuitry,
power good indicator, remote ON/OFF control,
and precision shunt regulator. The overvoltage
protection (OVP) function is for 3.3V, 5V, and
12V outputs. In addition, an uncommitted fault
detection input (PRIN) is available for use with
other protection functions, such as overcurrent,
undervoltage, and/or short-circuit protection of
outputs.
The shunt regulator has been included to
implement the feedback control for one of the
power supply's outputs. The noniverting input
(EAI) is internally tied to a precision 2.5V
reference.
The power good circuit monitors the 5V output
and asserts, with a programmable delay, a TTL
compatible high logic level at its output after the
5V output reaches the regulation range. The
delay is programmed by a timing capacitor
connected to CPG pin of the IC. The power
good circuit sets its output low before the 5V
output goes out of regulation range. The remote
ON/OFF function enables the power supply to
be turned on and off from the secondary side by
a switch.
AIC1686
2
ORDERING INFORMATION
AIC1686 XX
TOP VIEW
PIN CONFIGURATION
ORDER NUMBER
AIC1686CN
(PLASTIC DIP)
PACKAGE TYPE
N: PLASTIC DIP
TEMPERATURE RANGE
C: 0
°C~70°C
CPG
FL
REMO
REF
VCC
CLS
LS
EAI
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
PRIN
REMI
PG
V33
GND
V5
V12
EAO
TYPICAL APPLICATION CIRCUIT
AC/DC
CONVERTER
AIC1686
DC OUTPUTS
AC LINE SENSE
POWER
GOOD
PWM
CONTROLLER
OPTO-
ISOLATOR
OPTP-
ISOLATOR
REGULATION
PROTECTION O/P
REMOTE
ON/OFF
PROTECTION
INPUT
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC
................................................................................-0.5V to 16V
Pins: V12, V5, V33, LS, EAO ..................................................................... -0.5V to 16V
Any Other Pins .................................................................... GND - 0.5V to VCC+0.5V
Ambient Temperature Range ........................................................................ 0
°C~70°C
Thermal Information
Thermal Resistance,
JA
DIP Package .................................................. 110
°C/W
Maximum Junction Temperature (Plastic Package) ............................................... 125
°C
Maximum Storage Temperature Range ..................................................... -65
°C~150°C
Maximum Lead Temperature (Soldering 10 Sec) ................................................... 300
°C
Maximum Power Dissipation ............................................................................ 500mW
(Derate at 10mW/
°C above 70°C ambient)
AIC1686
3
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
ELECTRICAL CHARACTERISTICS
(VCC= 12V, Ta=25
°
°
°
°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
SYMBOL MIN. TYP. MAX. UNIT
VCC Supply Current
Nominal Mode ( Remote On)
All Outputs Unloaded
I
VCC
0.5
1
mA
Standby Mode ( Remote Off)
All Outputs Unloaded
I
VCCSB
0.4
0.8
mA
5V Reference (Note1)
Reference Voltage
I
O
=0 to 25mA, CL=1
µF
V
REF
4.85
5
5.15
V
Line Regulation
V
CC
=8V to 16V, CL=1
µF
15
mV
Error Amplifier
Internal Reference Voltage
V
EA
2.45
2.5
2.55
V
Maximum Output Sink Current
V
EAO
=1V
I
EA
20
mA
Open Loop Voltage Gain
80
dB
Unity Gain Bandwidth
CL=100pF
GBW
3
MHz
Power Supply Rejection Ratio
PSRR
85
dB
Slew Rate
CL=100pF
SR
2
V/
µS
Fault Detection
Fault Output High Voltage
I
OH
=500
µA, Remote On
V
FLOH
4
V
Fault Output High Voltage
I
OH
=20
µA, Remote Off
V
FLOHS
4
V
Fault Output Low Voltage
I
OL
=4.5mA
V
FLOL
0.4
V
3.3V Input OVP Trip Level
Input Voltage Rising
V33
OVP
3.7
4
4.3
V
5V Input OVP Trip Level
Input Voltage Rising
V5
OVP
5.5
6
6.5
V
12V Input OVP Trip Level
Input Voltage Rising
V12
OVP
13.2
14
15.6
V
Protection Input Trip Level
Input Voltage Rising
Input Voltage Falling
V
PIH
V
PIL
3.8
1.2
V
V
Fault Latch Delay
T
FL
10
25
50
µS
Remote ON/OFF
REMI Input Threshold
Input Voltage Rising
Input Voltage Falling
V
RIH
V
RIL
3.8
1.2
V
V
REMI Input Hysteresis
HYS
RI
0.7
1.8
V
AIC1686
4
ELECTRICAL CHARACTERISTICS
(CONTINUED)
PARAMETER
TEST CONDITIONS
SYMBOL MIN. TYP. MAX. UNIT
REMI Pull High Resistor
REMI=L
REMI=H
R
RIL
R
RIH
100
6
K
REMO Output Low Voltage
I
OL
=4.5mA
V
RO
L
0.4
V
REMO Output High Voltage
I
OH
=500
µA
V
ROH
4
V
Power Good
LS Input Clamp Voltage
I
LS
=1mA
V
LSCMP
7.8
8.8
9.8
V
LS Input Rising Threshold
CLS=5V
V
LSH
6.2
V
LS Input Hysteresis Voltage
HYS
LS
1
1.2
1.6
V
CPG Timing Current
V5=5V
I
CPGH
6
9
12
µA
CPG Input Hysteresis
HYS
CPG
0.4
V
CPG Recharge Delay Time
LS (L to H)
T
RCPG
6.7
mS
PG Output High Voltage
I
OH
=5mA
V
PGOH
4
V
PG Output Low Voltage
I
OL
=12mA
V
PGOL
0.4
V
Delay LS Falling to PG Falling
CPG=1
µF
T
PGF
52
µS
Delay LS Rising to PG Rising
CPG=1
µF
T
PGR
150
300
450
mS
Delay REMI Rising to PG Falling
T
RIPGF
1
µS
Note1: A 1
µ
F capacitor is connected between REF and GND to ensure a stable reference voltage.
AIC1686
5
TYPICAL PERFORMANCE CHARACTERISTICS
5V Reference Voltage vs. Temperature
Temperature (
°C)
5V
Ref
e
renc
e
V
o
l
t
age (
V
)
0
10
20
30
40
50
60
70
80
90
100
-10
4.9
4.95
5
5.05
5.1
Inverting Reference Voltage of Error Amplifier vs.
Inte
rn
al
R
e
fer
enc
e V
o
l
t
ag
e
of E
r
ro
r a
m
pl
i
f
i
e
r
(V
)
Temperature (
°C)
Temperature
0
10
20
30
40
50
60
70
80
90
100
-10
2.47
2.48
2.49
2.5
2.51
2.52
2.53
Inverting Input Voltage Change with Output Sink
Current of Error Amplifier
I
n
ver
t
in
g I
n
p
u
t
V
o
lt
ag
e C
h
an
g
e
(
m
V
)
Output Sink Current (mA)
0.01
0.1
1
10
0
10
20
30
40
50
EAO=1V
EAO=2.5V
CPG Timing Current vs. V5 voltage
V5 Input Voltage (V)
CP
G Ti
m
i
ng
c
u
rrent
(µ
A)
0
°C
25
°C
100
°C
4.5
4.7
4.9
5.1
5.3
5.5
4
6
8
10
12
Standby mode Vcc Supply Current vs. Temperature
Temperature (
°C)
Vc
c
Su
p
p
l
y
C
u
rr
e
n
t
(
m
A
)
0
10
20
30
40
50
60
70
80
90
100
-10
0.29
0.31
0.33
0.35
0.37
0.39
0.41
0.43
Delay CPG Rising to PG Ringing
CPG Timing Current (
µA)
TP
G
R
(
m
S
)
6
8
10
12
250
350
450
CPG =1
µF
PDF 
ZIP