PT6913 Datasheet PDF - PTC


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PT6913
PTC

Part Number PT6913
Description Current Regulator
Page 8 Pages

PT6913 datasheet pdf
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DESCRIPTION
PT6913 is a special current regulator to drive HV LED.
Compact, few external components design is very
flexible in many applications. PT6913 provides a
programmable 10~100mA constant current. Maximum
400V input voltage provides high reliability for HV LED
lighting. The simple driving topology will improve
power factor, efficiency. EMI issue will be avoided with
this linear control.
Special design is convenient in high-side application.
LED open/short is protected by PT6913. The high
voltage will be absorbed by PT6913 itself. LEDs will
never face high voltage problem.
To improve driving capability, PT6913 provides a pin to
drive external MOSFET. It will be flexible in larger
current application.
PT6913 also provide temperature compensation.
When internal junction temperature is higher than
135 , PT6913 will decrease the output current
linearly. The output current will be zero when junction
temperature reaches 150. This protection effectively
avoids the flicker problem during abnormal
environment temperature.
APPLICATIONS
GU10, MR16, E11, E17 LED Bulb
Compact Size LED Lighting
TRIAC Dimming
BLOCK DIAGRAM
Reference
PT6913
Current Regulator for HV LED
FEATURES
5V~400V Operating Voltage
10~100mA Programmable Output Current
±5% Current Accuracy (Target)
Less Than 150uA Operating Current
Parallel Using for High Current Application
Driving External MOSFET for Larger Current
LED Short Protection
Temperature Compensation
When TJ>135, output current will be decreased.
Output current will be zero when TJ=150
Electrical Capacitor Needless
High Power Factor
High Efficiency
Few External Components
SOT89-5 Package
Tel: 886-66296288Fax: 886-29174598http://www.princeton.com.tw2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan



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TYPICAL APPLICATION
PT6913
Normal Constant Current Regulator for HV LED
TRIAC Dimming Solution for HV LED
REF2.1 2 Nov., 2011



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ORDER INFORMATION
Valid Part Number
PT6913
Package Type
SOT89-5
PIN CONFIGURATION
PT6913
Top Code
PT6913
PIN DESCRIPTION
Pin Name
VIN
GND
GD
NC
IS
Description
IC Power Supply. VIN pin can be connected to high-voltage directly.
IC Ground. The LED current is provided from this pin in typical application.
Gate Drive. To improve PT6913 driving capability, GD can be connected with external MOSFET.
No Connection.
Output Current Setting. The output current is programmable from 10mA to 100mA by a resistor
across IS pin and IC GND pin.
Pin No.
1
2
3
4
5
REF2.1 3 Nov., 2011



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PT6913
FUNCTION DESCRIPTION
OPERATION
The PT6913 is conveniently used for high side application. The positive terminal of HV LED is connected with GND of
PT6913. The negative terminal of HV LED is connected with GND of DC-BUS. The VIN of PT6913 can be connected to
rectified voltage after bridge directly. The maximum 400V operating voltage can cover most AC applications.
OUTPUT CURRENT
The output current is set by the resistor across IS and GND. It can be calculated as following equation.
I
300mV
R
TEMPERATURE COMPESATION
The PT6913 integrates temperature compensation. When the junction temperature is higher than 135typically, the
output current or the reference voltage of IS will be decreased by 20mV/. Normally, the output current will be zero if the
junction temperature rises up to 150.
This function is useful when environment temperature is abnormal high. PT6913 will try to reduce the environment
temperature by reduce the LED current. The temperature will be balanced at some level if the abnormal condition is not
removed. The device will be protected and flicker doesn’t happen.
LED SHORT PROTECTION
The worst case is LED shorted with two terminals. PT6913 will try to regulate constant current. The voltage across
PT6913 will be very high. The junction temperature of PT6913 will be increased by higher power dissipation. It will work
into temperature compensation mode. It means that LED short protection is realized by temperature compensation.
REF2.1 4 Nov., 2011




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