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LYT4217 Datasheet(PDF) 8 Page - Power Integrations, Inc.

Part # LYT4217
Description  LYTSwitch High Power LED Driver IC Family
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

LYT4217 Datasheet(HTML) 8 Page - Power Integrations, Inc.

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Rev. B 02/13
8
LYT4211-4218/4311-4318
www.powerint.com
Modified DER-350 25 W High Power Factor LED Driver
for Non-Dimmable and Enhanced Line Regulation
The circuit schematic in Figure 9 shows a high power factor
LED driver based on a LYT4317 from the LYTSwitch family of
devices. It was optimized to drive an LED string at a voltage of
36 V with a constant current of 0.7 A, ideal for high lumen PAR
lamp retro-fit applications. The design operates over the
low-line input voltage range of 90 VAC to 132 VAC and is
non-dimming application. A non-dimming application has
tighter output current variation with changes in the line voltage
than a dimming application. It’s key to note that, although not
specified for dimming, no circuit damage will result if the end
user does operate the design with a phase controlled dimmer.
Modification for Non-Dimmable Configuration
The design is configurable for non-dimmable application by
simply removing the component for SCR active damper (R6,
R8, C3, and Q1), blocking diode D9 and R-C bleeder (R1, C1)
changes and replacing the reference resistor R14 with 24.9 k
W.
(See Figure 9)
Key Application Considerations
Power Table
The data sheet power table (Table 1) represents the minimum
and maximum practical continuous output power based on the
following conditions:
Efficiency of 80%
Device local ambient of 70 °C
Sufficient heat sinking to keep the device temperature below
100 °C
For minimum output power column
Reflected output voltage (V
OR) of 120 V
FEEDBACK pin current of 135
µA
BYPASS pin capacitor value of 47
µF
For maximum output power column
Reflected output voltage (V
OR) of 65 V
FEEDBACK pin current of 165
µA
BYPASS pin capacitor value of 4.7
µF (LYT4x11 = 4.7 µF)
Note that input line voltages above 85 VAC do not change the
power delivery capability of LYTSwitch devices.
Device Selection
Select the device size by comparing the required output power
to the values in Table 1. For thermally challenging designs, e.g.,
incandescent lamp replacement, where either the ambient
temperature local to the LYTSwitch device is high and/or there
is minimal space for heat sinking use the minimum output
power column. This is selected by using a 47
µF BYPASS pin
capacitor and results in a lower device current limit and therefore
lower conduction losses. For open frame design or designs
where space is available for heat sinking then refer to the
maximum output power column. This is selected by using a
4.7
µF BYPASS pin capacitor for all but the LYT4x11 which has
only one power setting. In all cases in order to obtain the best
output current tolerance maintain the device temperature below
100 °C
Maximum Input Capacitance
To achieve high power factor, the capacitance used in both the
EMI filter and for decoupling the rectified AC (bulk capacitor)
must be limited in value. The maximum value is a function of
the output power of the design and reduces as the output
power reduces. For the majority of designs limit the total
capacitance to less than 200 nF with a bulk capacitor value of
100 nF. Film capacitors are recommended compared to
ceramic types as they minimize audible noise with operating
with leading edge phase dimmers. Start with a value of 10 nF
for the capacitance in the EMI filter and increase in value until
there is sufficient EMI margin.
PI-6875a-101512
D
S
BP
V
R
FB
CONTROL
FL1
T1
RM8
12
1
FL2
10
11
R10
2 M
1%
R15
200 k
R9
510 k
1/8 W
R24
47 k
1/8 W
R25
47 k
1/8 W
R2
47 k
1/8 W
L1
1 mH
L2
1 mH
R14
24.9 k
1%
1/16 W
R18
165 k
1%
1/16 W
R23
20 k
36 V,
700 mA
90 - 132
VAC
RTN
L
N
R19
20 k
1/8 W
C5
100 nF
50 V
R26
30
R20
39
1/8 W
R17
3 k
1/10 W
R27
10
1/10 W
D2
DFLU1400
C7
2.2 nF
630 V
D3
US1J
D5
BAV16
Q2
MMBT3904
D8
BAV21
D6
BAV21
D7
BYW29-200
D4
US1D
R22
1 k
1/10 W
BR1
MB6S
600 V
RV1
140 VAC
F1
5 A
C11
330
µF
63 V
C13
100 pF
200 V
CY1
470 pF
250 VAC
C12
330
µF
63 V
C8
47
µF
16 V
C15
100 nF
50 V
C14
10 nF
50 V
C9
56
µF
50 V
LYTSwitch
U1
LYT4317E
C6
2.2
µF
250 V
C4
100 nF
250 V
L3
5 mH
C2
100 nF
250 V
Figure 9.
Modified Schematic of RD-350 for Non-Dimmable, Isolated, High Power Factor, 90-132 VAC, 25 W / 36 V LED Driver.


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