FAIRCHILD SG6518

SG6518
LCD Power Supply Supervisor
Features
Description
ƒ
Two Adjustable Voltage Sense Input Pins: VSV1
and VSV2
ƒ
Over-voltage Protection (OVP) for 5V, 12V, and two
outputs: V1, V2
ƒ
Over-current Protection (OCP) for 5V, 12V, and two
outputs: V1, V2
ƒ
Adjustable Voltage Control Sense Input of V1 and
V2 (ADJ-V1, ADJ-V2)
SG6518 provides the over-voltage protection (OVP) for
5V, 12V, and outputs V1 and V2 as well as over-current
protection (OVP) for 5V, 12V, and outputs V1 and V2.
When the voltage of OTP pin decreases to 1.2V, the
over-temperature protection (OTP) function is enabled.
FPO is set to HIGH to turn off the PWM control IC. The
voltage difference across the external current shunt is
used for OCP functions. An external resistor can be
used to adjust protection threshold.
ƒ
ƒ
ƒ
ƒ
ƒ
Open-drain Output for FPO Pin
13ms PSON Control Delay
No Lockup During the Fast AC Power-on/off
The power supply is turned on after a 13ms delay time
when the PSON signal is set from LOW to HIGH. To
turn off the power supply, PSON signal is set from
HIGH to LOW with the delay time 13ms.
Wide Supply Voltage Range: 4V to 15V
Programmable Over-temperature Protection (OTP)
Applications
ƒ
LCD Power Supply
Ordering Information
Part Number
Operating Temperature Range
Package
Packing Method
SG6518DZ
-40°C to +85°C
16-DIP
Rail
SG6518SZ
-40°C to +85°C
16-SOP
Reel & Tape
All packages are lead free per JEDEC: J-STD-020B standard.
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
SG6518 — LCD Power Supply Supervisor
December 2007
SG6518 — LCD Power Supply Supervisor
Application Diagram
Figure 1. Typical Application
Note:
1. R1 = 200Ω and R2 = 200Ω are suggested.
2. C1 and C2 are suggested to be 100nF to 2.2uF.
Internal Block Diagram
Figure 2. Function Block Diagram
Note:
3. The VSV1 pin is the power pin for the two OCP comparators.
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
2
SG6518 — LCD Power Supply Supervisor
Pin Configuration
Figure 3. Pin Configuration
Pin Definitions
Pin #
Name
Description
1
GND
Ground.
2
FPO
Fault protection output. Output signal to control the primary PWM IC through an opto-coupler.
When FPO is LOW, the PWM IC is enabled.
3
PSON
Remote on/off logic input from CPU or main-board. The power supply is turned on/off after 13ms
delay.
4
VSV1
V1 voltage sense input.
5
ADJ-V1
6
RI
7
ADJ-V2
8
VSV2
V2 voltage sense input.
9
ISV2
V2 over-current protection sense input. In typical applications, this pin is connected to the
positive end of a current shunt through one resistor. When the voltage on ISV2 is higher than
that of VSV2 by 6mV, OCP is enabled.
10
ISV1
VSV1 over-current protection sense input. In typical applications, this pin is connected to the
positive end of a current shunt through one resistor. When the voltage on ISV1 is higher than
that of VSV1 by 6mV, OCP is enabled.
11
IS12
12V over-current protection sense input. In typical applications, this pin is connected to the
positive end of a current shunt through one resistor. When the voltage on IS12 is higher than
that of VS12 by 6mV, OCP is enabled.
12
VS12
12V over-voltage control sense input.
13
IS5
5V over-current protection sense input. In typical applications, this pin is connected to the
positive end of a current shunt through one resistor. When the voltage on IS5 is higher than that
of VS5 by 6mV, OCP is enabled.
14
VS5
5V over-voltage control sense input.
15
VDD
Supply voltage, 4V ~ 15V. For general applications, it is connected to 5V-standby for supply
voltage.
16
OTP
For over-temperature protection. An external NTC thermistor is connected from this pin to
ground. The impedance of the NTC decreases at high temperatures. Once the voltage of the
OTP pin drops below a fixed limit of 1.2V, FPO is open-drain output.
(4)
V1 over-voltage control sense input.
Reference setting. One external resistor, Ri, connected between the RI and GND pins
determines a reference current, IREF = 1.5V/Ri, for OCP programming.
V2 over-voltage control sense input.
Note:
4. The VSV1 pin is the power pin for the two OCP comparators; it must be higher than VSV2.
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
3
SG6518 — LCD Power Supply Supervisor
Timing Diagram
Figure 4. PSON On/Off and 5V, 12V, V1, V2, OVP, and OCP Functions
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
4
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only. All voltage values, except differential voltages, are
given with respect to GND pin. Stresses beyond those listed under “absolute maximum ratings” may cause
permanent damage to the device.
Symbol
VDD
VI
VOUT
Parameter
Min.
DC Supply Voltage
Input Voltage
Output Voltage
Max.
Unit
16
V
ISV1, ISV2, VSV1, VSV2
-0.3
30.0
PSON, IS12,VS12
-0.3
15.0
ADJ-V1, ADJ-V2, IS5, VS5, OTP, RI
-0.3
7.0
FPO
-0.3
15.0
V
400
mW
V
PD
Power Dissipation
TJ
Operating Free Junction Temperature Range
-40
+125
°C
Storage Temperature Range
-55
+150
°C
+260
°C
Electrostatic Discharge Capability, Human Body Model
2.5
kV
Electrostatic Discharge Capability, Machine Model
200
V
TSTG
TL
ESD
Lead Temperature (Wave Soldering, 10 Seconds)
SG6518 — LCD Power Supply Supervisor
Absolute Maximum Ratings
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
VDD
DC Supply Voltage
TA
Operating Ambient Temperature Range
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
Min.
Max.
Unit
4
15
V
-40
+85
°C
www.fairchildsemi.com
5
Unless otherwise noted, operating specifications are VDD = 5V, TA=+25°C
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
15
V
VDD SECTION
VDD
DC Supply Voltage
IDD
Supply Current
tR
Supply Voltage Rising Time
VST
VDD Start Threshold Voltage
4
1.5
mA
1
ms
4
V
Over-Voltage and Over-Current Protection (OVP, OCP)
VOVP
IREF
Over-Voltage Protection VS5
5.7
6.1
6.5
Over-Voltage Protection VS12
13.2
13.8
14.4
7.6
8.0
8.4
Ratio of Current Sense Sink Current to
Current Sense Setting Pin (RI) Source
Current
RI = 23KΩ ~ 120KΩ
-7
V
VOFFSET
OCP Comparator Input Offset Voltage
7
mV
ILKG-FPO
Leakage Current (FPO)
FPO = 5V
5
µA
VOL-FPO
Low Level Output Voltage (FPO)
ISINK 10mA
0.5
V
tOVP
OVP Delay Time
33
75
110
µs
tOCP
OCP Delay Time
12.5
20.0
27.5
ms
VRI
RI Pin Voltage
1.455
1.50
1.545
V
158
200
242
ms
tST-OCP
Start-up OCP Protection Delay Time
FPO = LOW
SG6518 — LCD Power Supply Supervisor
Electrical Characteristics
ADJ Section
VADJNOR
Normal Voltage of ADJ-V1 & ADJ-V2
1.455
1.50
1.545
V
VADJOVP
Over-Voltage Protection of ADJ-V1 &
ADJ-V2
1.455
1.80
1.545
V
100
KΩ
1
V
PSON Control
RPSON
Input Pull-low Resistor
50
VIH
High-level Input Voltage
2
VIL
Low-level Input Voltage
tPSON
Timing PSON to On/Off
V
PSON HIGH to FPO
LOW
6
13
20
ms
PSON LOW to FPO
HIGH
6
13
20
ms
5.82
6.00
6.18
1.164
1.200
1.236
V
225
325
425
µs
Over-Temperature Protection (OTP)
IOTP
VOTP-OFF
tOTP
Ratio of OTP Source Current to Current
Sense Setting Pin (RI) Source Current
Threshold Voltage for OTP
Over-Temperature Debounce
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
6
These characteristic graphs are normalized at TA = 25°C.
1.5
8.4
8.3
1.4
8.1
IREF
IDD (mA)
8.2
1.3
1.2
8.0
7.9
7.8
1.1
7.7
7.6
1.0
-40
-25
-10
5
20
35
50
65
80
95
110
-40
125
-25
-10
5
20
35
50
65
80
95
110
125
Temperature℃
Temperature℃
Figure 5. Supply Current
Figure 6. Ratio of Sense Sink Current Sense Setting
Pin (RI) Source Current
5
SG6518 — LCD Power Supply Supervisor
Typical Performance Characteristics
30
4
25
2
tOCP (ms)
VOFFSET (mV)
3
1
0
-1
-2
20
15
-3
-4
-5
10
-40
-25
-10
5
20
35
50
65
80
95
110
125
-40
-25
-10
5
20
35
50
65
80
95
110
Temperature℃
Figure 7. OCP Comparator Input Offset Voltage
Figure 8. OCP Delay Time
1.60
100
1.55
90
tOVP (us)
VRI (V)
Temperature℃
1.50
1.45
125
80
70
1.40
60
-40
-25
-10
5
20
35
50
65
80
95
110
125
-40
-25
-10
5
Temperature℃
20
35
50
65
80
95
110
125
Temperature℃
Figure 9. RI Pin Voltage
Figure 10. OVP Delay Time
0.6
110
100
RPSON (kΩ)
VOL_FPO (V)
0.5
0.4
90
80
70
0.3
60
0.2
50
-40
-25
-10
5
20
35
50
65
80
95
110
125
-40
Temperature℃
-10
5
20
35
50
65
80
95
110
125
Temperature℃
Figure 11. Low Level Output Voltage
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
-25
Figure 12. Input Pull-low Resistor
www.fairchildsemi.com
7
If I1 • R1 > (IRI • 8) • R2, OCP is active.
The SG6518 provides over-current protection for the
5V, 12V, and two outputs: V1, V2. When an OCP
condition occurs at any of the voltage rails, FPO opens.
The internal OCP comparators have a very small offset
voltage (±6mV). The sink currents of IS5, IS12, ISV1,
and ISV2 are eight times the current at the RI pin. The
current at the RI pin is VRI/Ri. Here is an example
demonstrating how to set the over-current protection.
To select R2 Resistor:
If R1 = 5mΩ, Ri = 51k, OCP Protection Level is 5A, then
R2 = (I1 • R1)/(IRI • 8)
= (5A • 5mΩ) / {(1.5V / 51K) • 8}
= 106Ω
SG6518 — LCD Power Supply Supervisor
Applications Information (OCP)
Figure 13. Over-Current Protection
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
8
θ
D
9
16
E1
eB
E
8
1
A2
L
SG6518 — LCD Power Supply Supervisor
Physical Dimensions
A
e
b1
A1
Figure 14. 16-Pin, Dual Inline Package (DIP)(D)
Dimensions
Symbol
A
A1
A2
b
b1
D
E
E1
e
L
eB
θ°
Millimeter
Min.
Typ.
Inch
Min.
Max.
Typ.
Max.
5.334
0.381
3.175
18.669
6.121
2.921
8.509
0°
3.302
1.524
0.457
19.177
7.620
6.299
2.540
3.302
9.017
7°
0.210
3.429
0.015
0.125
19.685
0.735
6.477
0.241
3.810
9.525
15°
0.115
0.335
0°
0.130
0.060
0.018
0.755
0.300
0.248
0.100
0.130
0.355
7°
0.135
0.775
0.255
0.150
0.375
15°
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify
or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically
the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
9
SG6518 — LCD Power Supply Supervisor
Physical Dimensions (Continued)
16
9
E
1
H
Detail A
F
8
b
c
e
θ
D
A2
A
L
y
Detail A
A1
Figure 15. 16-Pin, Small-Outline Package (SOP)(S)
Dimensions
Symbol
A
A1
A2
b
c
D
E
e
H
L
F
y
θ°
Millimeter
Min.
Typ.
Inch
Min.
Max.
1.346
0.101
1.244
1.753
0.254
1.499
Typ.
0.406
0.203
9.804
3.810
10.008
3.988
0.386
0.150
6.198
1.270
0.228
0.016
0.394
0.157
0.050
0.381X45°
0°
0.069
0.010
0.059
0.016
0.008
1.270
5.791
0.406
Max.
0.053
0.004
0.049
0.244
0.050
0.015X45°
0.101
8°
0°
0.004
8°
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify
or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically
the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
10
SG6518 — LCD Power Supply Supervisor
© 2007 Fairchild Semiconductor Corporation
SG6518 • Rev. 1.0.0
www.fairchildsemi.com
11