Document
SG6518 — LCD Power Supply Supervisor
December 2007
SG6518 LCD Power Supply Supervisor
Features
Two Adjustable Voltage Sense Input Pins: VSV1 and VSV2 Over-voltage Protection (OVP) for 5V, 12V, and two outputs: V1, V2 Over-current Protection (OCP) for 5V, 12V, and two outputs: V1, V2 Adjustable Voltage Control Sense Input of V1 and V2 (ADJ-V1, ADJ-V2) Open-drain Output for FPO Pin 13ms PSON Control Delay No Lockup During the Fast AC Power-on/off Wide Supply Voltage Range: 4V to 15V Programmable Over-temperature Protection (OTP)
Description
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. 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.
Applications
LCD Power Supply
Ordering Information
Part Number
SG6518DZ SG6518SZ
Operating Temperature Range
-40°C to +85°C -40°C to +85°C
Package
16-DIP 16-SOP
Packing Method
Rail 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
Free Datasheet http://www.datasheet4u.com/
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
Free Datasheet http://www.datasheet4u.com/
SG6518 — LCD Power Supply Supervisor
Pin Configuration
Figure 3. Pin Configuration
Pin Definitions
Pin #
1 2 3 4 5 6 7 8 9
Name
GND FPO PSON VSV1 ADJ-V1 RI ADJ-V2 VSV2 ISV2
Description
Ground. Fault protection output. Output signal to control the primary PWM IC through an opto-coupler. When FPO is LOW, the PWM IC is enabled. Remote on/off logic input from CPU or main-board. The power supply is turned on/off after 13ms delay. V1 voltage sense input.
(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. V2 voltage sense input. 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..