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LM3450 データシート(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部品番号 LM3450
部品情報  LED Driver with Active Power Factor Correction and Phase Dimming Decoder
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3450 データシート(HTML) 3 Page - National Semiconductor (TI)

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Pin Descriptions
Pin
Name
Description
Application Information
1
V
REF
3V Reference
Reference Output: Connect directly to V
ADJ or to resistor divider feeding VADJ and
to necessary external circuits.
2
V
ADJ
Analog Adjust
Analog Dim and Phase Dimming Range Input: Connect directly to V
REF to force
standard 70% phase dimming range. Connect to resistor divider from V
REF to
extend usable range of some phase dimmers or for analog dimming. Connect to
GND for low power mode.
3
FLT2
Filter 2
Ramp Comparator Input: Connect a series resistor from FLT1 capacitor and a
capacitor to GND to establish second filter pole.
4
FLT1
Filter 1
Angle Decoder Output: Connect a series resistor to a capacitor to GND to
establish first filter pole.
5
DIM
500 Hz
PWM Output
Open Drain PWM Dim Output: Connect to dimming input of output stage LED
driver (directly or with isolation) to provide decoded dimming command.
6
V
AC
Sampled
Rectified Line
Multiplier and Angle Decoder Input: Connect to resistor divider from rectified AC
line.
7
COMP
Compensation
Error Amplifier Output and PWM Comparator Input: Connect a capacitor to GND
to set the compensation.
8
FB
Feedback
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
GND for isolated designs (bypasses error amplifier). Also includes over-voltage
protection and shutdown modes.
9
I
SEN
Input Current
Sense
Input Current Sense Non-Inverting Input: Connect to diode bridge return and
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
11
CS
Current Sense
MosFET Current Sense Input: Connect to positive terminal of sense resistor in
PFC MosFET source.
12
GATE
Gate Drive
Gate Drive Output: Connect to gate of main power MosFET for PFC.
13
V
CC
Input Supply
Power Supply Input: Connect to primary bias supply. Connect a 0.1µF bypass
capacitor to ground.
14
ZCD
Zero Crossing
Detector
Demagnetization Sense Input: Connect a 100k
Ω resistor to transformer/inductor
winding to detect when all energy has been transferred.
15
HOLD
Dynamic Hold
Open Drain Dynamic Hold Input: Connect to holding resistor which is connected
to source of passFET.
16
BIAS
Pre-regulator
Gate Bias
Pre-regulator Gate Bias Output: Connect to gate of passFET and through resistor
to rectified AC (drain of passFET) to aid with startup.
3
www.national.com


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