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偉詮電子股份有限公司 Weltrend Semiconductor, Inc.
WT7520 PC POWER SUPPLY PWM SUPERVISOR Data Sheet
REV. 0.9 February 21, 2005
The information in this document is subject to change without notice. Weltrend Semiconductor, Inc. All Rights Reserved.
新竹市科學工業園區工業東九路 24 號 2 樓 2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:[email protected]
WT7520 Data Sheet Rev. 0.90
GENERAL DESCRIPTION The WT7520 is a pulse–width modulation (PWM) control circuit with complete protection circuits for used in the SMPS (Switched Mode Power Supply). It contains various functions, which are Over Voltage Protection, Under Voltage Protection, Power Good Output (PGO), Remote On/Off control and etc. It can minimize external components of switching power supply systems in personal computer. Over Voltage Protection (OVP) monitors 3.3V, 5V, 12V and PT input voltage level. Under Voltage Protection (UVP) monitors 3.3V, 5V and 12V input voltage level. Power Good Output monitors the voltage level of power supply.
FEATURES • • • • • • • • • •
Complete PWM Control and Protection Circuitry Over Voltage Protection for 3.3V / 5V / 12V / PT Under Voltage Protection for 3.3V / 5V / 12V 280ms PG Time Delay Power Good Output is Open Drain Output PWM Control Output are Open Drain Output 280 mS Time Delay for UVP Remote ON/OFF function De–bounce Time Soft-Start function built-in 16–Pin Dual In–line Package
PIN CONFIGURATION 7520 V33
1
16
VADJ
V5
2
15
OPNEGIN
V12
3
14
OPOUT
PT
4
13
VCC
GND
5
12
DET
RT
6
11
PG
C1
7
10
SS
C2
8
9
REM
Ordering Number WT7520
Package Type DIP 16
Weltrend Semiconductor, Inc. Page 2
WT7520 Data Sheet Rev. 0.90
PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 9
Pin Name
TYPE I I I I P O O O I
V33 V5 V12 PT GND RT C1 C2 REM
10 11
SS PG
O O
12 13 14 15 16
DET VCC OPOUT OPNEGIN VADJ
I P O I I
FUNCTION OVP/UVP input FOR 3.3V. OVP/UVP input for 5V. OVP/UVP input for 12V. Extra OVP protection input. Ground. Oscillation frequency set by external resistor. PWM open drain output 1. PWM open drain output 2. Remote on/off input. REM=”low” that means the main SMPS is turned-on. REM=”high”, the main SMPS is turned-off. Soft start function set by external capacitor. Power good signal. PG= ”high” means “power good”. PG= ”low” means “power fail”. Extra protection input. Supply voltage. OP compensation output. OP compensation negative input. OP compensation positive input , voltage sense input.
*The difference between WT7905 and WT7520 ITEM WT7905 Pin-6 CT; external capacitor (PWM frequency) Pin-10 TPG; external capacitor (PG delay-time function) OVP-3.3V,5V,12V 100us (Typ.) UVP-3.3V,5V,12V 100us (Typ.) Soft-Start function Set by internal circuit Pin-4 (PT)
PT default 0.8V (with internal voltage divided resistors)
Weltrend Semiconductor, Inc. Page 3
WT7520 RT; external resistor (ex. 120kΩ) SS; external capacitor (Soft-start function) 510us (Typ.) 110us (Typ.) Set by external capacitor (Pin-10:SS) PT default 0.8V. (with internal voltage divided resistors) (24K+4.6K)
WT7520 Data Sheet Rev. 0.90
BLOCK DIAGRAM [1]
V33
[2]
V5
[3]
V12
- UV +
- UV +
- UV
UVP
110us
+
280ms delay IN
OUT CLR
-OV +
OVP
S
510us
-OV
Q
R
+
-OV +
-OV +
[4]
-
PT
+ 0.62V QOUT
5K [11]
280ms delay IN
[9]
36mS Delay
REM
OUT
REMONF Vss
4.5mS Delay [12]
PG
[10]
REMON SS
-
DET
+ 0.62V
OSC [6]
RT
CLR ERROR AMP
[16] [15]
VADJ OPNEGIN
PWM CONTROL PWMCMP
-
+
+
-
D
Q
C
QN
2.45V
+ [14]
-
OPOUT
DETCMP SOFT_START CONTROLLER
ABSOLUTE MAXIMUM RAT INGS, VCC=5.5V CHARACTERISTICS Supply voltage Drain output voltage Drain output current Power dissipation Operating temperature Storage temperature
SYMBOL VCC Vcc1, Vcc2 Icc1, Icc2 Pd Topr Tstg
VALUE 5.5 5.5 200 200 -10 ~ +70 -65 ~ +150
Weltrend Semiconductor, Inc. Page 4
Unit V V mA mW ℃ ℃
C1
[7]
C2
[8]
WT7520 Data Sheet Rev. 0.90
ELECTRICALCHARACTERISTICS,TA=25℃ , VCC=5V, CHARACTERISTICS DEAD TIME CONTROL SECTION INPUT THRESHOLD VOLTAGE
SYMBOL Vthdt
ERROR AMP SECTION CLOSE LOOP VOLTAGE GAIN CROSS OVER POINT OPNEG BIAS VOLTAGE OUTPUT SECTION OUTPUT SATURATION VOLTAGE Vdssat DRAIN OFF-STATE CURRENT Idoff RISING TIME Tr FALLING TIME Tf PROTECTION SECTION OVER VOLTAGE PROTECTION（OVP）V33 V5 V12 PT UNDER VOLTAGE PROTECTION V33 （UVP） V5 V12 UVP DISABLE VOLTAGE PT UVP DELAY TIME Td.uvp REMOTE ON/OFF SECTION REM HIGH INPUT VOLTAGE Vremh REM LOW INPUT VOLTAGE Vreml REM PULL HIGH VOLTAGE Vremo REM DELAY TIME Trem REM OFF DELAY TIME Toff POWER GOOD SECTION DETECTING INPUT VOLTAGE Vdet PG OUTPUT PULL–UP RESISTOR Rpup, pg PG OUTPUT LOAD RESISTOR Rpg PG DELAY TIME OUTPUT SATURATION VOLTAGE Vsat.pg SOFT START SECTION SINK CURRENT OF SS Iss.sink SOURCE CURRENT OF SS Iss.source TOTAL DEVICE STANDBY SUPPLY CURRENT Icc OSCILLATION SECTION OSCILLATION FREQUENCY Fosc
TEST CONDITION
Min.
Typ.
V
65 320 2.45
2.52
dB KHZ V
1.1 2 100 50
1.3 10 200 200
V uA ns ns
4.1 6.2 4.64 1.25 1.98 3.00 2.37 0.62 280
4.3 6.6 4.90 1.3 2.18 3.30 2.63 0.68 500
V V V V V V V V ms
0.8 5.25 42 5.5
V V V ms ms
3.0 0.1
0.5V ~ 3.5V 0dB OPNEG OPEN Id=200mA Vcc=Vd=Vs=0V
3.8 5.8 4.41 1.2 1.78 2.70 2.11 0.55 100 2.0 2.0 30 3.5 0.55 0.5 150 Ipg=10mA
36 4.5 0.62 5 1 280 0.2
0.68 2 350 0.4
10
Weltrend Semiconductor, Inc. Page 5
50
V KΩ KΩ ms V uA uA
13 700
RT=120KΩ
Unit
3.3
ZERO DUTY CYCLE MAX. DUTY CYCLE
2.38
Max.
20
mA
70
KHZ
WT7520 Data Sheet Rev. 0.90
APPLICATION NOTE 1. Input impedance: Pin No. 1 2 3 4
Pin Name V33 V5 V12 PT
Input impedance 47KΩ 73KΩ 47KΩ 24 KΩ+4.6 KΩ
2. Sawtooth OSC. Funcition:
Weltrend Semiconductor, Inc. Page 6
WT7520 Data Sheet Rev. 0.90
3.REMOTE ON/OFF： REM
REMONF
trem
REMON
trem
toff
toff
SS
4. Under Voltage Protection Delay Time： REM
REMON td,uvp UVP
5. Pulse Width Modulation Block： The output pulse width modulation is generated by comparision of the saw–tooth waveform from the capacitor CT to the of the voltage. Therefore, an increase in control signal amplitude cause a linear decrease of the output pulse width. Also, the SS(DTC and Soft-Start) limits the output pulse width. The timing diagram is shown as below: PWM OUT CT DTC FF-CLK FF-Q FF-QN C1 C2
Weltrend Semiconductor, Inc. Page 7
WT7520 Data Sheet Rev. 0.90
6. The function of “PT”: This signal is prepared for extra OVP/OPP (VPT > 1.25V) or another Disable Under Voltage Protection function (VPT < 0.62V) 7. Reference Application Ciruit:
8. In some application power system, adding an external resistor (R9) could reduce the peak value spike from the environments to pin 9 (REM) and avoid pin 9 (REM ) damaged by the external noise.
Weltrend Semiconductor, Inc. Page 8
WT7520 Data Sheet Rev. 0.90
MECHANICAL INFORMATION PLASTIC DUAL–IN–LINE PACKAGE
NOTE 1：All linear dimensions are in inches（millimeters）. NOTE 2：This drawing is subject to change without notice. NOTE 3：Falls within JEDEC MS–001
Weltrend Semiconductor, Inc. Page 9
WT7520 PC POWER SUPPLY PWM SUPERVISOR Data Sheet
REV. 0.9 February 21, 2005
The information in this document is subject to change without notice. Weltrend Semiconductor, Inc. All Rights Reserved.
新竹市科學工業園區工業東九路 24 號 2 樓 2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:[email protected]
WT7520 Data Sheet Rev. 0.90
GENERAL DESCRIPTION The WT7520 is a pulse–width modulation (PWM) control circuit with complete protection circuits for used in the SMPS (Switched Mode Power Supply). It contains various functions, which are Over Voltage Protection, Under Voltage Protection, Power Good Output (PGO), Remote On/Off control and etc. It can minimize external components of switching power supply systems in personal computer. Over Voltage Protection (OVP) monitors 3.3V, 5V, 12V and PT input voltage level. Under Voltage Protection (UVP) monitors 3.3V, 5V and 12V input voltage level. Power Good Output monitors the voltage level of power supply.
FEATURES • • • • • • • • • •
Complete PWM Control and Protection Circuitry Over Voltage Protection for 3.3V / 5V / 12V / PT Under Voltage Protection for 3.3V / 5V / 12V 280ms PG Time Delay Power Good Output is Open Drain Output PWM Control Output are Open Drain Output 280 mS Time Delay for UVP Remote ON/OFF function De–bounce Time Soft-Start function built-in 16–Pin Dual In–line Package
PIN CONFIGURATION 7520 V33
1
16
VADJ
V5
2
15
OPNEGIN
V12
3
14
OPOUT
PT
4
13
VCC
GND
5
12
DET
RT
6
11
PG
C1
7
10
SS
C2
8
9
REM
Ordering Number WT7520
Package Type DIP 16
Weltrend Semiconductor, Inc. Page 2
WT7520 Data Sheet Rev. 0.90
PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 9
Pin Name
TYPE I I I I P O O O I
V33 V5 V12 PT GND RT C1 C2 REM
10 11
SS PG
O O
12 13 14 15 16
DET VCC OPOUT OPNEGIN VADJ
I P O I I
FUNCTION OVP/UVP input FOR 3.3V. OVP/UVP input for 5V. OVP/UVP input for 12V. Extra OVP protection input. Ground. Oscillation frequency set by external resistor. PWM open drain output 1. PWM open drain output 2. Remote on/off input. REM=”low” that means the main SMPS is turned-on. REM=”high”, the main SMPS is turned-off. Soft start function set by external capacitor. Power good signal. PG= ”high” means “power good”. PG= ”low” means “power fail”. Extra protection input. Supply voltage. OP compensation output. OP compensation negative input. OP compensation positive input , voltage sense input.
*The difference between WT7905 and WT7520 ITEM WT7905 Pin-6 CT; external capacitor (PWM frequency) Pin-10 TPG; external capacitor (PG delay-time function) OVP-3.3V,5V,12V 100us (Typ.) UVP-3.3V,5V,12V 100us (Typ.) Soft-Start function Set by internal circuit Pin-4 (PT)
PT default 0.8V (with internal voltage divided resistors)
Weltrend Semiconductor, Inc. Page 3
WT7520 RT; external resistor (ex. 120kΩ) SS; external capacitor (Soft-start function) 510us (Typ.) 110us (Typ.) Set by external capacitor (Pin-10:SS) PT default 0.8V. (with internal voltage divided resistors) (24K+4.6K)
WT7520 Data Sheet Rev. 0.90
BLOCK DIAGRAM [1]
V33
[2]
V5
[3]
V12
- UV +
- UV +
- UV
UVP
110us
+
280ms delay IN
OUT CLR
-OV +
OVP
S
510us
-OV
Q
R
+
-OV +
-OV +
[4]
-
PT
+ 0.62V QOUT
5K [11]
280ms delay IN
[9]
36mS Delay
REM
OUT
REMONF Vss
4.5mS Delay [12]
PG
[10]
REMON SS
-
DET
+ 0.62V
OSC [6]
RT
CLR ERROR AMP
[16] [15]
VADJ OPNEGIN
PWM CONTROL PWMCMP
-
+
+
-
D
Q
C
QN
2.45V
+ [14]
-
OPOUT
DETCMP SOFT_START CONTROLLER
ABSOLUTE MAXIMUM RAT INGS, VCC=5.5V CHARACTERISTICS Supply voltage Drain output voltage Drain output current Power dissipation Operating temperature Storage temperature
SYMBOL VCC Vcc1, Vcc2 Icc1, Icc2 Pd Topr Tstg
VALUE 5.5 5.5 200 200 -10 ~ +70 -65 ~ +150
Weltrend Semiconductor, Inc. Page 4
Unit V V mA mW ℃ ℃
C1
[7]
C2
[8]
WT7520 Data Sheet Rev. 0.90
ELECTRICALCHARACTERISTICS,TA=25℃ , VCC=5V, CHARACTERISTICS DEAD TIME CONTROL SECTION INPUT THRESHOLD VOLTAGE
SYMBOL Vthdt
ERROR AMP SECTION CLOSE LOOP VOLTAGE GAIN CROSS OVER POINT OPNEG BIAS VOLTAGE OUTPUT SECTION OUTPUT SATURATION VOLTAGE Vdssat DRAIN OFF-STATE CURRENT Idoff RISING TIME Tr FALLING TIME Tf PROTECTION SECTION OVER VOLTAGE PROTECTION（OVP）V33 V5 V12 PT UNDER VOLTAGE PROTECTION V33 （UVP） V5 V12 UVP DISABLE VOLTAGE PT UVP DELAY TIME Td.uvp REMOTE ON/OFF SECTION REM HIGH INPUT VOLTAGE Vremh REM LOW INPUT VOLTAGE Vreml REM PULL HIGH VOLTAGE Vremo REM DELAY TIME Trem REM OFF DELAY TIME Toff POWER GOOD SECTION DETECTING INPUT VOLTAGE Vdet PG OUTPUT PULL–UP RESISTOR Rpup, pg PG OUTPUT LOAD RESISTOR Rpg PG DELAY TIME OUTPUT SATURATION VOLTAGE Vsat.pg SOFT START SECTION SINK CURRENT OF SS Iss.sink SOURCE CURRENT OF SS Iss.source TOTAL DEVICE STANDBY SUPPLY CURRENT Icc OSCILLATION SECTION OSCILLATION FREQUENCY Fosc
TEST CONDITION
Min.
Typ.
V
65 320 2.45
2.52
dB KHZ V
1.1 2 100 50
1.3 10 200 200
V uA ns ns
4.1 6.2 4.64 1.25 1.98 3.00 2.37 0.62 280
4.3 6.6 4.90 1.3 2.18 3.30 2.63 0.68 500
V V V V V V V V ms
0.8 5.25 42 5.5
V V V ms ms
3.0 0.1
0.5V ~ 3.5V 0dB OPNEG OPEN Id=200mA Vcc=Vd=Vs=0V
3.8 5.8 4.41 1.2 1.78 2.70 2.11 0.55 100 2.0 2.0 30 3.5 0.55 0.5 150 Ipg=10mA
36 4.5 0.62 5 1 280 0.2
0.68 2 350 0.4
10
Weltrend Semiconductor, Inc. Page 5
50
V KΩ KΩ ms V uA uA
13 700
RT=120KΩ
Unit
3.3
ZERO DUTY CYCLE MAX. DUTY CYCLE
2.38
Max.
20
mA
70
KHZ
WT7520 Data Sheet Rev. 0.90
APPLICATION NOTE 1. Input impedance: Pin No. 1 2 3 4
Pin Name V33 V5 V12 PT
Input impedance 47KΩ 73KΩ 47KΩ 24 KΩ+4.6 KΩ
2. Sawtooth OSC. Funcition:
Weltrend Semiconductor, Inc. Page 6
WT7520 Data Sheet Rev. 0.90
3.REMOTE ON/OFF： REM
REMONF
trem
REMON
trem
toff
toff
SS
4. Under Voltage Protection Delay Time： REM
REMON td,uvp UVP
5. Pulse Width Modulation Block： The output pulse width modulation is generated by comparision of the saw–tooth waveform from the capacitor CT to the of the voltage. Therefore, an increase in control signal amplitude cause a linear decrease of the output pulse width. Also, the SS(DTC and Soft-Start) limits the output pulse width. The timing diagram is shown as below: PWM OUT CT DTC FF-CLK FF-Q FF-QN C1 C2
Weltrend Semiconductor, Inc. Page 7
WT7520 Data Sheet Rev. 0.90
6. The function of “PT”: This signal is prepared for extra OVP/OPP (VPT > 1.25V) or another Disable Under Voltage Protection function (VPT < 0.62V) 7. Reference Application Ciruit:
8. In some application power system, adding an external resistor (R9) could reduce the peak value spike from the environments to pin 9 (REM) and avoid pin 9 (REM ) damaged by the external noise.
Weltrend Semiconductor, Inc. Page 8
WT7520 Data Sheet Rev. 0.90
MECHANICAL INFORMATION PLASTIC DUAL–IN–LINE PACKAGE
NOTE 1：All linear dimensions are in inches（millimeters）. NOTE 2：This drawing is subject to change without notice. NOTE 3：Falls within JEDEC MS–001
Weltrend Semiconductor, Inc. Page 9
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