Triple Output Power Supply for TFT-LCD
The XC9516 series can offer three different power supplies to TFT-LCD panels. These power supplies consist of a step-up DC/DC converter for a source driver, positive and negative charge pumps for a gate driver.
This IC has power-on sequences to keep inrush current as small when output voltage rises. The step-up DC/DC output can be used as power-on sequences with adding a P-channel FET as external component. Also, the FET can shut down a path to the power input line when CE pin is low.
Typical Application Circuit
|Input Voltage Range||2.5V～5.5V|
|Maximum Output Voltage||19V(Step-up DC/DC)|
|Output Voltage Accuracy||±1.5%|
|External MOSFET Gate Signal Output||N-channel open drain|
|Switch Over Current Protection||1.3A|
|Over Voltage Protection||Step-up DC/DC 21V|
|Short Circuit Protection||Positive and Negative Charge Pump|
|Thermal Shut Down||150℃|
|Operating Ambient Temperature||-40℃～+85℃|
|Environmentally Friendly||EU RoHS compliant, Pb free|
|Package||QFN-20||Number of Pins||20|
|Pcs/Reel||1,000||Package Size(mm)||4.0 x 4.0 x 0.8|
What does the standby mode mean in the case of the multi channel IC?
It means the state where the entire IC has been turned off. For Torex products, it means that the pin voltages of EN1 and EN2 are both 0V.
What is the soft-start function?
The function to soften the rise to prevent the inrush current.
What does CL mean?
Load capacitor. Other companies often refer to it as COUT.
What is the standby current?
The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.
What does the FB product mean?
An IC for which any output voltage can be set by the reference voltage of the FB pins and the external dividing resistor. The output voltage is determined by the RFB1 and RFB2 values, using the following formula: VOUT = Vref × (RFB1 + RFB2)/RFB2
How does UVLO (under voltage lockout) work?
This circuit forcibly turns off the driver transistor when VIN drops below the UVLO voltage. If the input voltage recovers to the value which is equal to the specified value or more, UVLO will be released to resume the switching operation. It is resumed by the soft-start function. The paused state by UVLO is not the shutdown. The pulse output is stopped, but the internal circuit is operating.