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LM3450 Datenblatt(PDF) 3 Page - Texas Instruments

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Teilenummer LM3450
Bauteilbeschribung  LED Drivers with Active Power Factor Correction and Phase Dimming Decoder
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Hersteller  TI1 [Texas Instruments]
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LM3450
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SNVS681C – NOVEMBER 2010 – REVISED JUNE 2011
PIN DESCRIPTIONS
Pin
Name
Description
Application Information
Reference Output: Connect directly to VADJ or to resistor divider feeding VADJ
1
VREF
3V Reference
and to necessary external circuits.
Analog Dim and Phase Dimming Range Input: Connect directly to VREF to force
standard 70% phase dimming range. Connect to resistor divider from VREF to
2
VADJ
Analog Adjust
extend usable range of some phase dimmers or for analog dimming. Connect to
GND for low power mode.
Ramp Comparator Input: Connect a series resistor from FLT1 capacitor and a
3
FLT2
Filter 2
capacitor to GND to establish second filter pole.
Angle Decoder Output: Connect a series resistor to a capacitor to GND to
4
FLT1
Filter 1
establish first filter pole.
Open Drain PWM Dim Output: Connect to dimming input of output stage LED
5
DIM
500 Hz PWM Output
driver (directly or with isolation) to provide decoded dimming command.
Multiplier and Angle Decoder Input: Connect to resistor divider from rectified AC
6
VAC
Sampled Rectified Line
line.
Error Amplifier Output and PWM Comparator Input: Connect a capacitor to GND
7
COMP
Compensation
to set the compensation.
Error Amplifier Inverting Input: Connect to output voltage via resistor divider to
control PFC voltage loop for non-isolated designs. Connect a 5.11k
Ω resistor to
8
FB
Feedback
GND for isolated designs (bypasses error amplifier). Also includes over-voltage
protection and shutdown modes.
Input Current Sense Non-Inverting Input: Connect to diode bridge return and
9
ISEN
Input Current Sense
resistor to GND to sense input current for dynamic hold. Connect a 0.1µF
capacitor and Schottky diode to GND, and a 0.22µF capacitor to HOLD.
10
GND
Power Ground
System Ground
MosFET Current Sense Input: Connect to positive terminal of sense resistor in
11
CS
Current Sense
PFC MosFET source.
12
GATE
Gate Drive
Gate Drive Output: Connect to gate of main power MosFET for PFC.
Power Supply Input: Connect to primary bias supply. Connect a 0.1µF bypass
13
VCC
Input Supply
capacitor to ground.
Demagnetization Sense Input: Connect a 100k
Ω resistor to transformer/inductor
14
ZCD
Zero Crossing Detector
winding to detect when all energy has been transferred.
Open Drain Dynamic Hold Input: Connect to holding resistor which is connected
15
HOLD
Dynamic Hold
to source of passFET.
Pre-regulator Gate Bias Output: Connect to gate of passFET and through
16
BIAS
Pre-regulator Gate Bias
resistor to rectified AC (drain of passFET) to aid with startup.
Copyright © 2010–2011, Texas Instruments Incorporated
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