STC6105 [SUNTAC]
Power Supply Supervisor + Regulator + PWM; 电源监控+调节+ PWM
| 型号： | STC6105 |
| 厂家： | 
SUNTAC ELECTRONIC CORP. |
| 描述： | Power Supply Supervisor + Regulator + PWM |
| 文件： | 总10页 (文件大小：460K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
FEATURES
ꢀ PC half-bridge (or 494) power supply supervisor +
two 431 + PWM
DESCRIPTION
STC6105 controller is designed for switching
mode power supply for desktop PCs. It provides all the
functions necessary to monitor and control the output of
the power supply. Remote ON/OFF control, power good
circuitry, some protection features against over-voltage
and over-power are implemented. It directly senses all the
output rails for OVP without the need of external dividers.
An innovated AC-signal sampling circuitry provides a
sufficient power-down warning signal for PG. A built-in
timer generates accuracy timing for control circuit
including the PS-off delay. The cycle-by-cycle PWM
switching prevents the power transformer from the
saturation and ensures the fastest response for the
short-circuit protection which greatly reduce the stress for
power transistors. Two internal precision TL431 shunt
regulators provide stable reference voltage and driver for
3.3V and 5V-standby regulation. Utilizing minimum
number of external components, the STC6105 includes
all of the functions for push-pull and/or half-bridge
topology, decreasing the production cost and PCB space,
and increasing the MTBF for power supply.
ꢀ High integration & few external components
ꢀ Over-voltage protection for 3.3V, 5V and 12V
ꢀ Under-voltage protection for 3.3V, 5V and 12V
ꢀ Under-voltage protection for –12V and/or –5V
ꢀ Over-power and short-circuit protection
ꢀ Power-down warning circuitry
ꢀ Power good circuitry
ꢀ Delay time for PSON and PG signal
ꢀ Remote ON/OFF function
ꢀ On-chip oscillator and error amplifier
ꢀ Two shunt regulator for 3.3V and 5V-Standby
ꢀ Latching PWM for cycle-by-cycle switching
ꢀ Push-pull PWM operation and totem pole outputs
ꢀ Soft-start and maximum 93% duty cycle
APPLICATIONS
Switching mode power supply for Computers, such
as:
ATX
NLX
SFX (micro-ATX)
MARKING DIAGRAMS
PIN CONFIGURATION
20
PSON
V33
V5
1
2
20
19
VCC
RI
18
STC6105
3
SS
17
16
4
5
IN
OPP
UVAC
NVP
V12
COMP
15
14
13
12
11
6
7
GND
FB1
8
VREF1
VREF2
FB2
OP2
OP1
PG
9
10
- 1 -
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
ORDERING INFORMATION
Package
Part Number
STC6105
20-Pin DIP
PIN DESCRIPTIONS
Pin Type
Name
Function
VCC
20
Supply
Supply voltage. 4.5V ~ 5.5V. It is connected to 5V-standby.
Power Good logic output, 0 or 1 (open-collector). PG = 1 means that the power is good for operation.
The PG delay is 300 msec.
PG
10
Logic output
V33
V5
2
3
7
Analog input
Analog input
Analog input
3.3V over-voltage/under-voltage control sense input.
5V over-voltage/under-voltage control sense input.
V12
12V over-voltage/under-voltage control sense input.
Over-power sense input. This pin is connected to driver transformer or the output of current
transformer. When not in use, this pin should be grounded.
Remote On/Off logic input forʳCPU or controller. Turn on/off the PWM Output after the 7.5 msec / 26
msec delay.
OPP
4
Analog input
PSON
1
Logic input
PSON = 0 means that the main SMPS is operational.
PSON =1 means that the main SMPS is off and the latch is reset.
The protection input for negative output, such as –12V and/or –5V. Trip voltage = 2.1V.
AC fail detection, detect main AC voltage under-voltage and/or failure.
Error amplifier output and the input of the PWM comparator.
The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference voltage.
The soft-start. It is settable through external capacitor. The current source output at this pin is 8uA and
the voltage is clamped at 2.5V.
NVP
UVAC
COMP
IN
6
Analog input
Analog input
Analog output
Analog input
5
16
17
SS
18
Analog input
Analog output
The totem-pole output drivers of push-pull PWM. The output are enabled (low) only when the NAND
gate inputs are high, the maximum duty cycle on an output (OP1 or OP2) is 46%.
Output for first converter regulation loop.
OP1/OP2
9/8
FB1
14
13
11
12
Analog output
Analog input
Analog output
Analog input
Program.
VREF1
FB2
Reference comparison input for first converter regulation loop. 2.5V.
Output for second converter regulation loop.
VREF2
Reference comparison input for second converter regulation loop. 2.5V.
Connected to external resistor for the reference setting.
RI
19
15
Analog input
Supply
RI = 75k ohms.
GND
Ground.
- 2 -
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
BLOCK DIAGRAM
V33
2
V5
3
V12
7
UVAC
5
RI
PG
10
GND
15
VCC
20
19
DSD
2uA
Vref
14
13 VREF1
FB1
UV
Detector
COMP
_
+
0.7V
Delay
300msec
OV
Protector
11
FB2
Delay
3sec
UV
Protector
12 VREF2
COMP
_
+
5V
3.2V
64uA
COMP
COMP
_
+
2.1V
2.4V
Vcc
Delay
7msec
2.5V
Buffer
6
4
NVP
OPP
D
Q
_
9
OP1
8uA
D
Q
_
Q
CK
_
+
+
CK
Delay
7msec
COMP
Buffer
R
+
_
O.S.C
Error
Amp
Delay
15msec
Vcc
8
OP2
COMP
_
+
S
R
Q
On/Off Delay
26msec
7.5msec
1.4V
Delay
2msec
1
PSON
18
17
IN
16
COMP
SS
- 3 -
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
TIMING DIAGRAM
VCC
PSON
3.3/5/12V
tpson(on)
tuvp
NVP
tpson(off)
tnvp
SS(on/off)
tpsoff
PG
tPG
VCC
PSON
Voltage < VUVAC
UVAC
OPP
tOPP
SS(on/off)
PG
- 4 -
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Parameter
Value
Unit
V
DC Supply Voltage at Pin 20
Shunt Regulator Output at Fb1, Fb2 Pins
Output Current at PG, Fb1, Fb2 Pins
Power Dissipation (TA=25к)
Power Dissipation (TA=90к)
Storage Temperature Range
16
VFB
16
V
IOUT
30
mA
W
PD,25
PD,90
TSTG
RTJA
к
1.5
к
0.5
W
-55 to +150
82.5
к
Thermal Resistance, Junction-To-Air
Operating Junction Temperature
Operating Ambient Temperature
Lead Temperature (Soldering, 10sec)
ESD Capability, HBM model
к/W
к
TJ,MAX
TA,MAX
TL
150
-30 to +125
260
к
к
3.0
kV
Note: All voltage values, except differential voltage, are with respect to network ground terminal.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Value
4.5 to 5.5
4 to 16
Unit
V
DC Supply Voltage at Pin 20
Shunt Regulator Output at Fb1, Fb2 Pins
Operating Ambient Temperature Range
VFB
V
TOPER
-25 to +85
к
ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25qC)
Symbol
Parameter
Test Condition
Min.
-
Typ.
5
Max.
10
Unit
mA
V
ICC
Total Supply Current
PG High
VOVP1
VOVP2
VOVP3
VUVP1
VUVP2
VUVP3
VUVS1
VUVS2
Over-Voltage Protection 3.3V
-
3.9
5.7
13.75
2.0
3.0
6.0
2.5
4.0
9.4
2.02
2.0
57
4.1
6
4.3
Over-Voltage Protection 5V
-
6.3
V
Over-Voltage Protection 12V
-
14.05
2.6
3.6
7.2
2.8
4.3
10.1
2.4
2.1
64
14.35
2.8
V
Under-Voltage Protection 3.3V
Under-Voltage Protection 5V
-
V
-
3.9
V
Under-Voltage Protection 12V
Under-Voltage Sense 3.3V for PG Low
Under-Voltage Sense 5V for PG Low
Under-Voltage Sense 12V for PG Low
Over-Power Protection.
-
8.0
V
-
3.0
V
-
4.5
V
VUVS3
-
10.4
2.66
2.2
V
1
VOPPS
VNVP
INVP
tOVP
tUVP
tUVS
tOPP
*
VUVAC = 1.5V
-
V
Negative Voltage Protection: Voltage Level
Negative Voltage Protection: Source Current
Timing for Over-Voltage Protection
Timing for Under-Voltage Protection
Timing for Under-Voltage Sense for PG Low
Timing for Over-Power-Protection
Timing for Negative Voltage Protection
V
RI = 75k
RI = 75k
RI = 75k
RI = 75k
RI = 75k
RI = 75k
72
uA
us
ms
ms
ms
ms
35
50
65
0.8
0.37
3.3
3.3
2.4
1.2
7
3.75
1.88
11.3
10.2
tNVP
7
Note *1: VOPPS = (2/3) x VOPP + (1/3) x VUVAC
;
- 5 -
!
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
Shunt Regulator (FB1, VREF1, FB2, VREF2)
Symbol
Parameter
Test Condition
IFB = 0.5mA, TA = 25к
IFB = 0.5mA to 10mA
TA = -25к to 85к
4 < VFB < 16V
Min.
Typ.
Max.
Unit
V
VREF
Reference Voltage
2.475
2.5
-
2.525
*2
VDEV, I
Deviation of VREF Over Load Current
Deviation of VREF Over Temperature
Line Regulation
-
20
30
-
mV
* 2
VDEV, T
-
10
1
mV
*2
Regli-fb
-
mV/V
mA
*2
Iout-fb
Output Sinking Current Capability
VFB > 2V
10
-
-
Note *2: Not tested in production test.
Power Good Section
Symbol
tpg
Parameter
Test Condition
RI = 75k
-
Min.
Typ.
300
0.7
1
Max.
Unit
ms
V
Timing for PG Delay
200
400
0.75
-
Vuvac
*2
UVAC Voltage Sense for PG
PG Good Output Rising Time
PG Good Falling Time
0.65
tR
CL = 100pF
CL = 100pF
IPG = 5mA
VPG = 5V
-
-
-
-
us
*2
tF
300
-
-
ns
Vol2
Ion2
Power Good Output Saturation Level
Power Good Leakage Current Collector
0.5
1
V
-
uA
Remote On/Off
Symbol
Vpson
Parameter
Test Condition
Min.
Typ.
1.4
-
Max.
2.0
Unit
V
PSON Input Threshold Level
Remote Input Driving Current
Timing PSON to On/Off
On
-
-
1
-
Ipson
0.5
mA
tpson(ON)
tpson(OFF)
tpsoff
RI = 75k
RI = 75k
17
5
26
7.5
2
45
ms
ms
Off (PS-off)
28.8
6.3
Timing PG low to Power Off
1.5
Error Amplifier
Symbol
Parameter
Test Condition
Min.
2.45
-
Typ.
Max.
Unit
V
V2.5
*2
IIB
Reference Voltage
-
-
-
-
-
2.5
-
2.55
Input Bias Current
0.1
uA
* 2
AVOL
BW * 2
Open-Loop Voltage Gain
Unity Gain Bandwidth
Power Supply Rejection Ratio
50
60
1
-
-
-
dB
0.3
50
MHz
dB
PSRR * 2
-
Oscillator Section
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fosc
PWM Frequency
RI = 75k
60
65
70
KHz
Soft-Start Section
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Iss
Charge Current
RI = 75k
6
8
9.3
uA
- 6 -
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
Comparator Section
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DC
Duty Cycle
-
85
-
93
%
PWM Output Section (OP1, OP2)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
0.5
Unit
V
Vol
Voh
RO
Output Voltage Low
Output Voltage High
Output Impedance of VOH
Io = 5mA
V12 = 12V
-
-
-
-
-
4
-
V
1.5
3.3
k
- 7 -
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
APPLICATION 1
-12V
12V
5V
+
+
+
+
MAIN
Transformer
3.3V
UVAC
V33
V5
3.3V
V12
VCC
5Vsb
VREF2
5Vsb
47~100ohm
Pok
STBY
Transformer
PG
FB2
1Kohm
PSON
PSon
-12V
-5V
VREF
+
NVP
FB1
OP1
RI
GND
5V
Vdd
IN
12V
COMP
SS
OP2
OPP
- 8 -
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
condition is reached. A 2K pull up resistor may
connect to5V.
Example of Using STC6105 for the ATX
Power Supply
ꢀ The VCC can be supplied from the 5V-standby.
When the VCC voltage is higher than 7V, besides the
shunt regulator, the circuit of STC6105 will be
shutdown and reset. No extra power supply is
needed.
Protection against over-voltage, short-circuit and
fault conditions is mandatory in PC power supplies. These
protection circuits can be realized by using many discrete
components and comparators, which occupy a lot of PCB
space and also add to assembling costs. This single chip
controller IC provides complete protection circuits, shunt
regulators, and PWM control function and with less
number of components. STC6105 is an ideal controller
IC for PC switching mode power supplies.
ꢀ Two internal high precision 431 shunt regulators are
built-in. It provides stable reference voltages.
ꢀ Complete PWM control circuitry including the error
amplifier for push-pull or half-bridge operation.
Supervisory Circuit Operation
The features and benefits of this device are listed
below:
The PC generates the remote ON/OFF logic (PSON),
which is “Low” for power supply “On” and “High” to
switch off the power supply. The remote ON/OFF is
connected to PSON input.
ꢀ Over-voltage and under-voltage protection for 3.3V,
5V and 12V without external divider
ꢀ Over-power protection.
ꢀ UV protection for –12V and/or –5V.
ꢀ Power-down warning for power good signal.
ꢀ Power good signal and power-fail lockup
ꢀ Remote on/off control.
ꢀ Delay time for PSON and PS-off signal.
ꢀ Two shunt regulator for 3.3V and 5V-Standby
regulation.
APPLICATION GUIDES
Introduction
The application guide shows the key-feature of
STC6105 and illustrates how to use in an ATX
switching mode power supply (SMPS). STC6105 is
suitable for half-bridge, push-pull topology. It
incorporates with a 4-channel supervisor, including
5V-standby. The PWM section of STC6105 comprises a
built-in 65kHz oscillator and high immunity circuits,
which protect the system from noise interference and
provide more noise margins for improper PCB layout.
STC6105 has OVP and UVP for 12V, 5V and 3.3V.
Besides, the NVP is used for negative voltage protection,
such as –12V and/or –5V. The UVAC (AC fails detection)
is applied to detect AC line condition. Two built-in
internal precision TL431 shunt regulators can be used for
3.3V or 5V auxiliary standby power.
ꢀ Complete pulse width modulation (PWM) control
circuitry.
ꢀ On-chip oscillator.
ꢀ Programmable Soft-Start.
ꢀ Maximum 93% duty cycle
ꢀ Few external components
ꢀ More reliable system
ꢀ Little space on PCB
ꢀ Easy trouble-shooting and implementation
FEATURE DESCRIPTIONS
ꢀ Over voltage protection can be implemented without
any additional components. Over-voltage sense
Levels or 3.3V, 5V, 12V are 4.1V, 6.1V, 14.5V
respectively.
AC Fails Detection
ꢀ Over current and/or short circuit protection can also
be achieved by using over-power protection, in
which OPP pin is connected to the current
transformer (driver transformer).
Through a resistor divider, UVAC is connected to
the secondary power transformer for detecting the AC line
condition. Once the voltage of UVAC is lower than 0.7V
for a period of time, such as 200usec, the PG (power good)
signal will be pulled low to indicate an AC line
power-down condition. The voltage amplitude of the
ꢀ The power good signal is asserted to indicate the
3.3V, 5V and 12V is above the under voltage
threshold level. PG pin goes high when the above
- 9 -
Product Specification
STC6105 Power Supply Supervisor + Regulator + PWM
PWM switching signal in the secondary power
Negative Voltage Protection
transformer is proportional to the AC line voltage. Adjust
the ratio of resistor divider to decide the threshold of
power-down warning. A small capacitor is connected
from UVAC to ground for filtering the switching noise.
The NVP provides an UVP (under voltage protection)
for negative voltage outputs. An under-voltage represents
the phenomenal of the overload condition in negative
voltage output. For example, the –12V output may drop
to –10V during the overload situation. A resistor
determining the threshold of the protection is connected
from pin NVP to the negative voltage output. Via this
resistor, NVP outputs a 64uA constant current to the
negative voltage output. When the NVP voltage is over
2.1V and the situation kept for longer than 7 msec,
STC6105 will lock the power outputs off.
VS
Vo
Vin
R1
+
UVAC
R2
C1
0.7V
VNVP = 64 uA u (R1 + R2) – V-12V
The power outputs will be locked off when VNVP t
2.1V.
Over Power Protection (OPP)
The OPP (over power protection) is used for
detecting over power and/or short-circuit conditions.
When OPPS voltage (p.4, Note-1) is higher than 2.1V and
this situation existed for longer than 7 msec,STC6105 will
pull the PG low and lock off the power outputs.
64uA
R1
R2
+
-12V
-5V
OP1
2.1V
Vdd
OP2
R1
R2
OPP
C1
R3
- 10 -
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