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Power Integrations

LYT1404 Datasheet Preview

LYT1404 Datasheet

Single-Stage LED Driver IC

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LYT1402-1604
LYTSwitch-1 Family
Single-Stage LED Driver IC with Combined PFC and
Constant Current Output for Buck Topology
Product Highlights
Single-Stage PFC + Accurate CC Output
±3% CC regulation in single line input voltage applications
Power factor >0.9
High efficiency >93%
Robust 725 V MOSFET for increased line voltage surge performance
Critical Conduction Mode (CrM) buck
Low EMI
Excellent line noise and transient rejection
Design Flexibility
Supports high- and low-side buck topologies
Wide input (90 VAC – 308 VAC) and output voltage range operation
3 family members cover power range for optimum device selection
Requires no inductor bias winding
Highest Reliability
Lowest component count
Comprehensive protection features with auto-restart
Input and output overvoltage protection (OVP)
Output short-circuit protection
Open-loop protection
Advanced thermal control
Thermal foldback ensures that light continues to be delivered at
elevated temperatures
Over-temperature shutdown provides protection during fault
conditions
Description
The LYTSwitch™-1 family is ideal for single-stage, high PF, constant
current LED bulbs and tubes.
The family incorporates a high-voltage MOSFET with a variable on-time
CrM controller. Extensive protection features with minimum external
components provide industry leading power density and functionality.
The devices can be used in high-side or low-side non-isolated buck
topology.
The CrM operation results in low turn-on losses and reduces cost of
output diode (slower reverse recovery).
LYTSwitch-1 devices are suitable for applications from 2 W to 22 W.
See Table 1 for selection guidance.
Figure 2. SO-8 D Package.
M BP
DS
FB
LYTSwitch-1
Figure 1a. High-Side Buck − Typical Application Schematic.
PI-7906-050316
LYTSwitch-1
FB
SD
BP M
PI-7905-050316
Figure 1b. Low-Side Buck − Typical Application Schematic.
Output Power Table1
Product3
LYT1402D
LYT1403D
LYT1404D
Optimized for Smallest Components
VOUT ≤ 30 V2
4.0 W
7.5 W
11 W
45 V ≤ VOUT ≤ 55 V2
8.0 W
15 W
22 W
Product3
LYT1602D
LYT1603D
LYT1604D
Optimized for Lowest THD
VOUT ≤ 30 V2
4.0 W
7.5 W
11 W
VOUT ≥ 55 V2
8.0 W
15 W
22 W
Table 1. Output Power Table (Buck Topology).
Notes:
1. Maximum practical continuous power in an open frame design with adequate
heat sinking, measured at 50˚C ambient.
2. Output power scales linearly if VOUT falls in between the specified voltages.
3. Package: SO-8 (D Package).
www.power.com
This Product is Covered by Patents and/or Pending Patent Applications.
July 2016




Power Integrations

LYT1404 Datasheet Preview

LYT1404 Datasheet

Single-Stage LED Driver IC

No Preview Available !

LYT1402-1604
MULTI-
FUNCTION
(M)
INPUT
LINE
SENSE
IOVP
Line_Comp
ZERO
CURRENT
DETECTION
VOUT
SENSE
OOVP
VOUT_SS
0.7 × VFB(REF)
R1
0V
FEEDBACK
(FB)
R2
IVALLEY
IPK
ILIMIT
SOA
THERMAL OTP
SHUTDOWN
DRAIN
(D)
REGULATOR
5.25 V
BYPASS
(BP)
FAULT
FAULT
HANDLING
UV
AC_High
CONTROL
LOGIC
AC_Valley
SYSTEM
CLOCK
UP/DN
COUNTER
TON
STATE
MACHINE
SOURCE
(S)
4.5 V
SQ
RQ
PI-7907-040416
Figure 3. Block Diagram.
Pin Functional Description
BYPASS (BP) Pin:
5.25 V supply rail.
MULTIFUNCTION (M) Pin:
Mode 1: FET OFF
Detection of inductor de-magnetization (ZCD) to ensure CrM.
Output OVP Sensing (120 % of VOUT nominal).
Steady-state operation voltage range is [1 V – 2.4 V].
Mode 2: FET ON
Line OVP.
FEEDBACK (FB) Pin:
FET current sensing using external current sense resistor.
Normal operation voltage range is [VFB(REF) – 0 V].
DRAIN (D) Pin:
High-voltage internal MOSFET.
SOURCE (S) Pin:
Power and signal ground.
D Package (SO-8)
1
BP
2
M
3
FB
4
D
8
S
7
S
6
S
5
S
Figure 4. Pin Configuration.
PI-7908-032216
2
Rev. B 07/16
www.power.com


Part Number LYT1404
Description Single-Stage LED Driver IC
Maker Power Integrations
Total Page 14 Pages
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