LYT4216E Power Integrations, LYT4216E Datasheet - Page 8

• Manufacturer Part Number: LYT4216E
• Description: LED Lighting Drivers HighPower LED Driver 35W
• Manufacturer: Power Integrations

Specifications of LYT4216E

• Rohs: yes
• Input Voltage: 85 V to 132 V
• Operating Frequency: 124 kHz to 140 kHz
• Maximum Supply Current: 1.2 mA
• Output Current: 2.83 A
• Maximum Operating Temperature: + 150 C
• Mounting Style: Through Hole
• Package / Case: eSIP-7C
• Minimum Operating Temperature: - 40 C

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 kW.
(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:
•
•
•
•
Figure 9.
Rev. B 02/13
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
•
•
•
LYT4211-4218/4311-4318
8
Reflected output voltage (V
FEEDBACK pin current of 135 µA
BYPASS pin capacitor value of 47 µF
47 kΩ
1/8 W
R25
Modified Schematic of RD-350 for Non-Dimmable, Isolated, High Power Factor, 90-132 VAC, 25 W / 36 V LED Driver.
5 A
F1
L
1 mH
L1
140 VAC
90 - 132
47 kΩ
1/8 W
VAC
RV1
R2
MB6S
600 V
BR1
N
1 mH
L2
100 nF
250 V
C2
OR
) of 120 V
47 kΩ
1/8 W
5 mH
R24
L3
100 nF
250 V
C4
510 kΩ
1/8 W
2.2 µF
250 V
R9
C6
LYTSwitch
LYT4317E
2 MΩ
R10
1%
U1
DFLU1400
D2
D
S
200 kΩ
US1J
US1D
R15
CONTROL
D3
D4
R
24.9 kΩ
•
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.
1/16 W
V
R14
1%
FB
•
•
•
For maximum output power column
BAV16
1/10 W
2.2 nF
630 V
3 kΩ
R17
BP
C7
D5
47 µF
16 V
C8
Reflected output voltage (V
FEEDBACK pin current of 165 µA
BYPASS pin capacitor value of 4.7 µF (LYT4x11 = 4.7 µF)
165 kΩ
1/16 W
10 nF
MMBT3904
50 V
C14
R18
1%
Q2
12
1
1/10 W
RM8
10 Ω
T1
R27
FL1
FL2
10
11
1/10 W
BAV21
1 kΩ
1/8 W
R22
39 Ω
R20
D8
BAV21
BYW29-200
100 nF
100 nF
30 Ω
R26
D6
50 V
50 V
C15
C5
D7
OR
100 pF
200 V
C13
) of 65 V
20 kΩ
1/8 W
R19
250 VAC
56 µF
50 V
470 pF
C9
CY1
330 µF
63 V
C11
330 µF
63 V
C12
www.powerint.com
PI-6875a-101512
20 kΩ
R23
700 mA
36 V,
RTN