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AL6562 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Transition Mode PFC LED Controller - Diodes

भाग संख्या AL6562
समारोह Transition Mode PFC LED Controller
मैन्युफैक्चरर्स Diodes 
लोगो Diodes लोगो 
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AL6562 pdf
AL6562
Pin Descriptions
Pin Number Pin Name
1 INV
2 COMP
3 MULT
4 CS
5 ZCD
6 GND
7 GD
8 VCC
Brief Description
Inverting Input Pin of the Internal Error Amplifier
This pin is connected externally via a resistor divider from the regulated output voltage. It can provide
input to inverting input of internal error amplifier. This pin can also be used as ENABLE/DISABLE
control input.
Output from Error Amplifier
A feedback compensation network consisting of resistor and capacitor connects between INV (Pin1)
and this pin to reduce the bandwidth and achieve stability of the voltage control loop and ensure high
power factor and low THD.
Input to the Internal Multiplier
This pin connects to the rectified mains voltage through external resistor divider to provide a sinusoidal
voltage reference for the control current loop.
Current Sense Connecting to External Resistor for Current Feedback
The current flowing in the MOSFET is sensed through a resistor, the resulting voltage is applied to this
pin and compared with an internal sinusoidal-shaped reference generated by the multiplier to determine
MOSFET’s turn-off. This pin has an internal Leading-Edge-Blanking of about 200 nanoseconds to
improve noise immunity.
Zero Current Detection
This pin takes input from inductors demagnetization sensing to achieve zero current detection, required
for Transition Mode (TM) operation. A negative-going edge triggers turn-on of MOSFET.
System Ground
Ground for circuit. Current return for both the signal circuitry and the gate drive stage.
Gate Driver Output
This pin is able to drive external MOSFET. The totem-pole output stage is able to drive MOSFET with a
peak current of 600mA/800mA for source and sink capability respectively. The high level voltage of this
pin is internally clamped at about 12V to avoid excessive gate voltage in case VCC pin is supplied by a
higher voltage.
System Power Input Pin
This pin is for supply voltage of both the signal part and gate driver of the IC. Upper limit is extended to
a maximum of 22V to provide more headroom for supply voltage changes. This pin has an internal 25V
Zener to protect the IC itself from overvoltage transients.
Functional Block Diagram
INV
VCC
COMP
MULT
CS
1
INV_Disable
2
3
Multiplier
4
40K
Voltage
0.47 V/0.3V Regulation
Overvoltage
Detection
8
24V
In ter na l
R1 Supply 7.5V
UVL O
INV_Disable
1.7V
RQ
S
10 pF
VCC
Driver
7
R2 Vref
ZCD_Disable
2.1V
1.6V
5
Zero Current
Detector
Upper &
Lower
Clamp
St arter
6
ZCD
GND
GD
AL6562
Document Number: DS37542 Rev. 2 - 2
2 of 16
www.diodes.com
February 2015
© Diodes Incorporated

विन्यास 16 पेज
डाउनलोड[ AL6562 Datasheet.PDF ]


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