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
•
•
•
•
•
•
•
BP
M
±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
D
S
FB
LYTSwitch-1
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
PI-7906-050316
Figure 1a. High-Side Buck − Typical Application Schematic.
• 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
LYTSwitch-1
conditions
FB
S
Description
BP
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.
PI-7905-050316
Figure 1b. Low-Side Buck − Typical Application Schematic.
Output Power Table1
Product3
Optimized for Smallest Components
VOUT ≤ 30 V2
45 V ≤ VOUT ≤ 55 V2
LYT1402D
4.0 W
8.0 W
LYT1403D
7.5 W
15 W
LYT1404D
11 W
22 W
Product3
Figure 2. SO-8 D Package.
D
M
Optimized for Lowest THD
VOUT ≤ 30 V2
VOUT ≥ 55 V2
LYT1602D
4.0 W
8.0 W
LYT1603D
7.5 W
15 W
LYT1604D
11 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
July 2016
This Product is Covered by Patents and/or Pending Patent Applications.
LYT1402-1604
DRAIN
(D)
INPUT
LINE
SENSE
IOVP
ILIMIT
SOA
Line_Comp
THERMAL
SHUTDOWN
MULTIFUNCTION
(M)
BYPASS
(BP)
REGULATOR
5.25 V
OTP
ZERO
CURRENT
DETECTION
SOURCE
(S)
OOVP
VOUT
SENSE
VOUT_SS
FAULT
HANDLING
FAULT
UV
4.5 V
SYSTEM
CLOCK
IVALLEY
0.7 × VFB(REF)
R1
FEEDBACK
(FB)
0V
IPK
AC_High
CONTROL
LOGIC
UP/DN
COUNTER
AC_Valley
TON
STATE
MACHINE
S
Q
R
Q
R2
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.
D Package (SO-8)
BP
M
FB
D
1
8
2
7
3
6
4
5
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.
S
S
S
S
PI-7908-032216
Figure 4. Pin Configuration.
SOURCE (S) Pin:
Power and signal ground.
2
Rev. B 07/16
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LYT1402-1604
Applications Design Example
Wide Input 8 W Bulb Driver Accurate Regulation, High
Power Factor, Low ATHD Design Example (RDK-464)
R4
12.4 kΩ
1%
1/8 W
L1
3.3 mH
L
RF1
10 Ω
2W
90 - 300
VAC
RV1
300 VAC
M
D
S
FB
BR1
B10S-G
1000 V
C1
47 µF
400 V
BP
R6
2.49 Ω
1%
C5
4.7 µF
10 V
LYTSwitch-1
U1
LYT1603D
C4
150 nF
450 V
8
T3
EE10
1 mH
R7
402 kΩ
1%
1/8 W
1
60 V, 135 mA
+V
R5
0.68 Ω
1%
D1
US1J
R8
100 kΩ
1/8 W
C6
150 µF
63 V
N
RTN
PI-7987-0610S16
Figure 5. Schematic from RDK-464 8 W, 60 V, 135 mA, Non-isolated A19 LED Driver for Wide Input Range: 90 – 300 V VAC using LYT1603D in High-Side Buck
Configuration.
The circuit shown in Figure 5 is configured as high-side buck power
supply utilizing the LYT1603D from the LYTSwitch-1 family of ICs.
This is a low-cost LED driver designed to drive a 60 V LED voltage
string at 135 mA output current with an input voltage range of
90 VAC to 300 VAC.
Circuit Description
LYTSwitch-1 is a SO-8 package LED driver controller IC designed for
non-isolated buck topology applications. The LYTSwitch-1 provides
high efficiency, high power factor and accurate LED current regulation. It incorporates a high-voltage 725 V power MOSFET and a
control engine to switch the FET in critical conduction mode with
variable frequency and variable on-time for low EMI, accurate current
regulation, high power factor, low THD and high efficiency. The
controller also integrates protection features such as input and output
overvoltage protection, thermal fold-back, over-temperature
shutdown, output short-circuit and over-current protection.
Input Stage
The input fusible resistor RF1 provides safety protection and also
serves as a current limiting component against high-voltage differential surge. Varistor RV1 acts as a voltage clamp that limits the voltage
spike on the primary during line transient voltage surge events. A
300 VAC rated part was selected with a maximum clamping voltage
specification of 710 VDC lower than the device drain voltage (725 V).
The AC input voltage is full wave rectified by BR1 to achieve good
power factor and low THD. For higher surge capability such as
>1 kV, C1 and L1 can be placed before the bridge rectifier BR1 in the
same order and RV1 after BR1 but, a safety X-capacitor is required to
be used for C1.
The rectified AC supply through BR1 is filtered by the input capacitors
C1 and C4. Too much capacitance degrades power factor and THD,
so the values of the input capacitors were adjusted to the minimum
values necessary to meet EMI with a suitable margin. Inductor L1,
C1 and C4 form a π (pi) filter, which attenuates conducted differential
and common mode EMI currents. A resistor of at least 10 kΩ (not
shown) across L1 can be used damp the Q-factor of the filter inductor
to improve filtering high frequency EMI without reducing low
frequency attenuation.
LYTSwitch-1 Controller Stage
The LED driver circuit is a high-side buck configuration operating in
critical condition mode. During the time the internal MOSFET is on,
current ramps up through inductor T3, storing energy in the magnetic
field and at the same time supplying current to the load. Then when
the internal MOSFET turns off, the current will continue to flow in the
same direction ramping down, to the output load via flywheel diode D1.
Capacitor C5 provides local decoupling for the BYPASS (BP) pin of
LYTSwitch-1 IC, which provides power to the controller during the
switch on time. The IC internal regulator draws power from the
high-voltage DRAIN (D) pin and charges the bypass capacitor C5
during the power switch off-time. The typical BYPASS pin voltage is
5.22 V. To keep the IC operating normally especially during the dead
zone, where VIN < VOUT, the value of the capacitor should be large
enough to keep the bypass voltage above the VBP(RESET) reset value of
4.5 V. Recommended minimum value for the bypass capacitor is
4.7 mF, X7R if using a ceramic type capacitor.
3
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Rev. B 07/16
LYT1402-1604
Constant output current regulation is achieved through the FEEDBACK (FB) pin directly sensing the drain current during the FET
on-time using external current sense resistors (RFB) R5 and R6 and
comparing the voltage drop to a fixed internal reference voltage
(VFB(REF)) of absolute value 279 mV typical. RFB can be estimated by
the given equation;
R FB = V FB(REF) /k # I OUT
Where: k is the ratio between IPK and IOUT; such that k = 3 for
LYT-14xx, and k = 3.6 for LYT-16xx)
Trimming RFB may be necessary to center IOUT at the nominal output
LED voltage.
The MULTIFUNCTION (M) pin monitors the line for any line overvoltage event. When the internal MOSFET is in on-state, the MULTIFUNCTION pin is shorted internally to the SOURCE (S) pin in order to
detect the rectified input line voltage derived for the voltage across
the inductor, i.e. (VIN – VOUT) and current flowing out of the MULTIFUNCTION pin is defined by resistor R7, thus the line over voltage
detection is calculated as follows;
V LINE(OVP) = I IOV # R7 + VOUT
Where: R7 is assumed to be 402 kΩ ±1%.
A small output pre-load resistor R8 discharges the output capacitor
when the driver is turned off, giving a relatively quick and smooth
decay of the LED light. Recommended pre-load power dissipation is
≤ 0.5% of the output power.
Key Design Considerations
Device Selection
The data sheet power table (Table 2) represents the maximum
practical continuous output power that can be delivered in an open
frame design with adequate heat sinking.
RDK-464 is a universal input 8 W driver for bulb application, where
the operating temperature is high and a relatively low THD less than
25% is desired for universal input application. LYT1603D was chosen
based on these conditions.
Output Power Table
Product
R4 can be calculated as follows;
R4 = 2 V # R7/ ^ VOUT - 2 V h
This is also applicable to Low-Side Configuration Buck topology
(see application note AN-67).
Another function of the MULTIFUNCTION (M) pin is for zero current
detection (ZCD). This is to ensure operation in critical conduction
mode. The inductor demagnetization is sensed when the voltage
across the inductor begins to collapse towards zero as flywheel diode
(D1) conduction expires.
Output Stage
During the switching off-state, free-wheeling diode D1 rectifies the
voltage across T3 and the output filtered by C6. An ultrafast 1 A,
600 V with 75 ns reverse recovery time (tRR) diode was selected for
efficiency and good regulation. The value of the output capacitor C8
was selected to give peak-to-peak LED ripple current equal to 30% of
the mean value. For designs where lower ripple is desirable, the
output capacitance value can be increased.
VOUT ≤ 30 V
45 V ≤ VOUT ≤ 55 V
LYT1402D
4.0 W
8.0 W
LYT1403D
7.5 W
15 W
LYT1404D
11 W
22 W
Once the detected current exceeds the input overvoltage threshold
(IIOV) of 1 mA typical, the IC will inhibit switching instantaneously and
initiate auto-restart to protect the internal MOSFET of the IC.
The MULTIFUNCTION (M) pin also monitors the output for any
overvoltage and undervoltage event. When the internal MOSFET is in
off-state, the output voltage is sensed via divider resistors R4 and R7
across the inductor voltage of T3. When an output open-load condition
occurs, the voltage at the MULTIFUNCTION pin will rise abruptly and
when it exceeds the VOOV threshold of 2.4 V typical, the IC will inhibit
switching and initiate auto-restart to limit the output voltage from
further rising. The overvoltage cut-off is typically set to 120% of the
output voltage, which is equivalent to 2 V target at the MULTIFUNCTION pin (VOUT(OVP) = VOUT × 2.4 V / 2 V). If desired, higher overvoltage cut-off can be set with lower MULTIFUNCTION pin voltage target.
Resistor R7 is set to a fixed value of 402 kΩ ±1% and R4 will determine
the output overvoltage limit. Any output short-circuit at the output
will be detected once the MULTIFUNCTION pin voltage falls below the
undervoltage threshold (VOUV) of 1 V typical, then the IC will inhibit
switching and initiate auto-restart to limit the average input power of
less than 1 W, preventing any component from overheating.
Optimized for Smallest Components
Product
Optimized for Lowest THD
VOUT ≤ 30 V
VOUT ≥ 55 V
LYT1602D
4.0 W
8.0 W
LYT1603D
7.5 W
15 W
LYT1604D
11 W
22 W
Table 2.
Output Power Table.
Magnetic Selection
The core is a small size EE10 with ferrite core material and open
winding window that allowed better convection cooling for the
winding.
To ensure proper magnetic design and accurate output current
regulation, it is recommended that the LYTSwitch-1 PIXls spreadsheet
located at PI Expert web site (https://piexpertonline.power.com/site/
login) should be used for magnetic calculations.
EMI Considerations
Total input capacitance affects PF and THD – increasing the value will
degrade performance. LYTSwitch-1’s control engine allows operating
in critical conduction mode with variable frequency and variable
on-time provides low EMI and enables the use of small and simple pi
(π) filter. It also allows simple magnetic construction where the main
winding can be wound continuously using the automated winding
approach preferred for low-cost manufacturing. The recommended
location of the EMI filter is after the bridge rectifier. This allows the
use of regular film capacitors as opposed to more expensive safety
rated X-capacitors that would be required if the filter is placed before
the bridge.
Thermal and Lifetime Considerations
Lighting applications present thermal challenges to the driver. In
many cases the LED load dissipation determines the working ambient
temperature experienced by the drive. Thermal evaluation should be
performed with the driver inside the final enclosure. Temperature
has a direct impact on driver and LED lifetime. For every 10 °C rise in
temperature, component life is reduced by a factor of 2. Therefore, it
is important to verify and optimize the operating temperatures of all
components.
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Rev. B 07/16
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LYT1402-1604
PCB Layout Considerations
In Figure 6, the EMI filter components should be located close
together to improve filter effectiveness. Place the EMI filter components C1 and L1 as far away as possible from any switching nodes on
the circuit board especially U1 drain node, output diode (D1) and the
transformer (T3).
Care should be taken in placing the components on the layout that
are used for processing input signals for the feedback loop that any
high frequency noise coupled to the signal pins of U1 may affect
proper system operation. The critical components in RDK-464 are R4,
R5, R6, R7 and C5. It is highly recommended that these components
be placed very close to the pins of U1 (to minimize long traces which
could serve as antenna) and far away as much as possible from any
high-voltage and high current nodes in the circuit board to avoid
noise coupling.
The bypass supply capacitor C5 should be placed directly across
BYPASS pin and SOURCE pin of U1 for effective noise decoupling.
As shown in Figure 6, minimize the loop areas of the following
switching circuit elements to lessen the creation of EMI.
• Loop area formed by the transformer winding (T3), free-wheeling
rectifier diode (D1) and output capacitor (C6).
• Loop area formed by input capacitor (C4), U1 internal MOSFET,
free-wheeling rectifier diode (D1) and sense resistor (R5).
LYTSwitch-1 Low-Side Configuration
In Figure 8, LYTSwitch-1 employs low-side Buck configuration and the
ground potential SOURCE pins are used for heat sinking. This allows
the designer to maximize the copper area for good thermal management but, without having the risk of increased EMI.
LYTSwitch-1
(U1)
MULTIFUNCTION Pin
Divider Resistors R7 & R4
Maximized Copper
Heat Sink
INPUT
OUTPUT
Tight Loop Area Formed by Input
Capacitor (C4), Free-Wheeling Diode (D1),
Output Capacitor (C6), MOSFET (U1),
Sense Resistor (R5) R9 & C4
BYPASS Pin
Capacitor C5
Tight Loop Area Formed by the
Free-Wheeling Diode (D1), Output
Capacitor (C6), Inductor (T3)
R9 & C4
PI-7988-061016
Figure 6. Design Example RDK-464 PCB Layout Showing the Critical Loop Areas with LYTSwitch-1 in High-Side Buck Configuration.
120 V, 170 mA
V+
R1
10 kΩ
1/8 W
L
F1
1A
C1
190 - 300 100 nF
VAC
305 V
N
L1
4.7 mH
BR1
B10S-G
1000 V
RV1
275 VAC
C2
150 nF
450 V
C3
68 µF
160 V
D1
US1J
600 V
R7
2.2 Ω
1%
1/8 W
R6
0.51 Ω
1%
1/8 W
R4
200 kΩ
1/8 W
LYTSwitch-1
LYT1604D
C5
4.7 µF
16 V S
R5
6.81 kΩ
1%
1/16 W
FB
D
R3
200 kΩ
1%
L2
1.5 mH
C4
100 pF
1000 V
BP M
RTN
VPI-7959-051816
R2
200 kΩ
1%
1/8 W
Figure 7. Schematic from DER-548 a 20 W, 120 V-170 mA Non-isolated LED Driver for Tube with High-line Input Range of 190 – 300 VAC using LYT1604D.
5
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Rev. B 07/16
LYT1402-1604
Tight Loop Area Formed by Input
Capacitor (C2), Free-Wheeling Diode (D1),
MOSFET (U1), Sense Resistor (R6)
Tight Loop Area Formed by the
Free-Wheeling Diode (D1), Output
Capacitor (C3), Inductor (L2)
INPUT
OUTPUT
Maximized Copper
Heat Sink
MULTIFUNCTION Pin
Capacitor (C4), Divider
Resistors R2 & R5
BYPASS Pin
Capacitor C5
LYTSwitch-1
(U1)
PI-7989-061016
Figure 8. Design Example DER-548 PCB Layout Showing the Critical Components and Loop Areas with LYTSwitch-1 in Low-Side Buck Configuration.
Since the switch MOSFET is referenced to ground, the low-side buck
configuration would also give an advantage of using a low-cost
off-the-shelf dog bone type inductor as demonstrated in the design
example DER-548. The addition of a small capacitor C4 (Figure 7) is
needed to couple the high-voltage referenced signal of the output
voltage into the MULTIFUNCTION pin of the IC through the resistor
divider network R2, R3 and R5. Based on the simulation and bench
results capacitance of 100 pF is a good compromise between AC line
rejection and flatness of the output voltage during the off-time of the
switch. Based on capacitance tolerance, 68 pF to 150 pF range can
be used.
Design Tools
Up-to-date information on design tools can be found at the Power
Integrations web site: www.power.com
LYTSwitch-1 PIXls spreadsheet is located at PI Expert online:
https://piexpertonline.power.com/site/login
Quick Design Checklist
Maximum Drain Voltage
Verify that the peak Drain voltage stress (VDS) does not exceed
725 V under all operating conditions, including start-up and fault
conditions.
Maximum Drain Current
Measure the peak Drain current under all operation conditions
(including start-up and fault conditions). Look for transformer
saturation (usually occurs at highest operating ambient temperatures).
Verify that the peak current is less than the stated Absolute Maximum
Rating in the data sheet.
Thermal Check
At maximum output power, for both minimum and maximum line
voltage and maximum ambient temperature verify that component’s
temperature specifications are not exceeded for the LYTSwitch-1,
transformer, output diodes and output and input capacitors.
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Rev. B 07/16
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LYT1402-1604
Absolute Maximum Ratings(1,3)
DRAIN Pin Voltage:
LYT1x0x............................ -0.3 V to 725 V
DRAIN Pin Peak Current: LYT1x02............................ 1.05 A (1.3 A)(1)
LYT1x03..............................2.1 A (2.6 A)(1)
LYT1x04............................. 2.8 A (3.5 A)(1)
BYPASS Pin Voltage.................................................... -0.3 V to 6.0 V
MULTIFUNCTION, FEEDBACK Pin Voltage................. -0.45 V to 7.0 V(2)
Lead Temperature................................................................. 260 °C
Storage Temperature....................................................-65 to 150 °C
Operating Junction Temperature................................. -40 to 150 °C(4)
Notes:
1. The higher peak Drain current (in parentheses) is allowed while the
Drain voltage is simultaneously less than 400 V for 725 V integrated
MOSFET.
2. In case SOURCE pin is open, -0.7 V between FEEDBACK pin and
SOURCE pin is observed with no degradation in performance.
3. The Absolute Maximum Ratings specified may be applied, .one at a
time without causing permanent damage to the product. Exposure
to Absolute Maximum Ratings for extended periods of time may
affect product reliability.
4. Normally limited by internal circuitry.
Thermal Resistance
Thermal Resistance: SO-8 Package:
(qJA).................................100 °C/W(2), 80 °C/W(3)
(qJC)(1) ................................................. 30 °C/W
Notes:
1. Measured on the SOURCE pin close to plastic interface.
2. Soldered to 0.36 sq. inch (232 mm2) 2 oz. (610 g/m2) copper clad,
with no external heat sink attached.
3. Soldered to 1 sq. in. (645 mm2), 2 oz, (610 g/m2) copper clad.
Conditions
SOURCE = 0 V
TJ = -40 °C to 125 °C
(Unless Otherwise Specified)
Min
Typ
Max
Units
fMIN
18
20
22
kHz
Maximum Switch
ON-Time
TON(MAX)
37.5
40
45
µs
Minimum Switch
ON-Time
TON(MIN)
1.012
1.1
1.25
µs
FEEDBACK Pin
Reference Voltage
VFB(REF)
-285
-279
-273
mV
Dead Zone Detect
Threshold
V TH(DZ)
0.3 ×
VFB(REF)
V
Maximum Constant
Current Zone
TCC(MAX)
6
ms
Forced Minimum
Constant Current Zone
TCC(MIN)
1.2
ms
Standby (MOSFET not switching)
180
µA
LYT1x02
680
LYT1x03
785
LYT1x04
850
Parameter
Symbol
Control Functions
Minimum Switching
Frequency
ISBY
BYPASS Pin
Supply Current
BYPASS Pin
Charge Current
BYPASS Pin Voltage
IDSS
TJ = 25 °C
See Note C
MOSFET Switching
µA
ICH1
VBP = 0.0 V, VDS ≥ 36 V
-10
-4.5
mA
ICH2
VBP = 5.0 V, VDS ≥ 36 V
-6
-2
mA
5.075
5.22
VBP
5.35
V
7
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Rev. B 07/16
LYT1402-1604
Parameter
Symbol
Conditions
SOURCE = 0 V
TJ = -40 °C to 125 °C
(Unless Otherwise Specified)
Min
Typ
Max
Units
Control Functions (cont.)
BYPASS Pin
Shunt Voltage
VBP(SHUNT)
5.2
5.39
5.55
V
BYPASS Pin Power-Up
Reset Threshold Voltage
VBP(RESET)
4.35
4.5
4.65
V
Circuit Protection
Current Limit for
Auto-Restart
Fault Minimum Switch
ON-Time
Auto-Restart
ILIMIT(AR)
di/dt = 277 mA/µs
TJ = 25 °C
LYT1x02
0.59
0.65
0.70
di/dt = 446 mA/µs
TJ = 25 °C
LYT1x03
1.06
1.15
1.24
di/dt = 662 mA/µs
TJ = 25 °C
LYT1x04
1.61
1.75
1.88
250
400
TFAULT(MIN)
TAR(OFF)1
TAR(OFF)2
100
TJ = 25 °C
A
ns
ms
1000
Input Overvoltage
Threshold
IIOV
TJ = 25 °C
0.9
1.0
1.1
mA
MULTIFUNCTIONAL Pin
Auto-Restart Threshold
Voltage (Output OVP)
VOOV
TJ = 25 °C
2.3
2.4
2.48
V
MULTIFUNCTIONAL Pin
Undervoltage Threshold
(Output Short)
VOUV
TJ = 25 °C
See Note B
0.91
0.95
0.99
V
Junction Temperature
at Fold-Back
TFB
See Note B
138
145
152
°C
Thermal Shutdown
Temperature
TSD
See Note A
160
°C
Thermal Shutdown
Hysteresis
TSD(H)
See Note A
75
°C
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Rev. B 07/16
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LYT1402-1604
Parameter
Symbol
Conditions
SOURCE = 0 V
TJ = -40 °C to 125 °C
(Unless Otherwise Specified)
Min
Typ
Max
TJ = 25 °C
9.2
10.6
TJ = 100 °C
14.0
16.1
TJ = 25 °C
4.5
5.2
TJ = 100 °C
6.8
7.8
TJ = 25 °C
3.4
3.9
TJ = 100 °C
5.1
5.8
Units
Output
LYT1x02
ID = 91 mA
ON-State Resistance
RDS(ON)
LYT1x03
ID = 139 mA
LYT1x04
ID = 182 mA
OFF-State Leakage
Breakdown Voltage
IDSS1
BVDSS
VBP = 5.25 V,
VDS = 580 V
TJ = 125 °C
LYT1x02
40
LYT1x03
55
LYT1x04
70
LYT1x0x
725
W
mA
V
NOTES:
A. Guaranteed by design.
B. This parameter is derived from characterization. Non-production test.
C. All parts are individually trimmed in production to deliver the best CC accuracy.
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Rev. B 07/16
LYT1402-1604
1
0.8
0.6
0.4
Scaling Factors:
LYT1x02 1.0
LYT1x03 2.0
LYT1x04 2.7
0.2
1000
100
0
0
2
4
6
10
1
8 10 12 14 16 18 20
0
DRAIN Voltage (V)
50 100 150 200 250 300 350 400 450
DRAIN Voltage (V)
Figure 1. DRAIN Pin Current vs. Drain Pin Voltage.
Figure 2. DRAIN Pin Capacitance vs. DRAIN Pin Voltage.
1.2
PI-7972-052616
DRAIN Pin Current (A)
(Normalized to Absolute Max Rating)
Scaling Factors:
LYT1x02 1.0
LYT1x03 2.0
LYT1x04 2.7
PI-7971-052616
TCASE = 25 °C
TCASE = 100 °C
DRAIN Pin Capacitance (pF)
DRAIN Pin Current (A)
1.2
PI-7970-052616
Typical Performance Characteristics
1
0.8
0.6
0.4
0.2
0
0
100 200 300 400 500 600 700 800
DRAIN Voltage (V)
Figure 3. Maximum Allowable DRAIN Pin Current vs. DRAIN Pin Voltage.
10
Rev. B 07/16
www.power.com
LYT1402-1604
SO-8 (D Package)
4
B
0.10 (0.004) C A-B 2X
2
DETAIL A
4.90 (0.193) BSC
A
4
8
D
5
2 3.90 (0.154) BSC
GAUGE
PLANE
SEATING
PLANE
6.00 (0.236) BSC
0-8
C
1.04 (0.041) REF
2X
0.10 (0.004) C D
Pin 1 ID
1
4
0.25 (0.010)
BSC
0.40 (0.016)
1.27 (0.050)
0.20 (0.008) C
2X
7X 0.31 - 0.51 (0.012 - 0.020)
0.25 (0.010) M C A-B D
1.27 (0.050) BSC
1.25 - 1.65
(0.049 - 0.065)
1.35 (0.053)
1.75 (0.069)
o
DETAIL A
0.10 (0.004)
0.25 (0.010)
0.10 (0.004) C
H
7X
SEATING PLANE
C
Reference
Solder Pad
Dimensions
+
1.45 (0.057) 4.00 (0.157) 5.45 (0.215)
+
D08A
0.17 (0.007)
0.25 (0.010)
1.27 (0.050)
+
+
0.60 (0.024)
Notes:
1. JEDEC reference: MS-012.
2. Package outline exclusive of mold flash and metal burr.
3. Package outline inclusive of plating thickness.
4. Datums A and B to be determined at datum plane H.
5. Controlling dimensions are in millimeters. Inch dimensions
are shown in parenthesis. Angles in degrees.
PI-5615-020515
11
www.power.com
Rev. B 07/16
LYT1402-1604
MSL Table
Part Number
MSL Rating
LYT1402D
1
LYT1403D
1
LYT1404D
1
LYT1602D
1
LYT1603D
1
LYT1604D
1
ESD and Latch-Up Table
Test
Conditions
Results
Latch-up at 125 °C
JESD78D
Human Body Model ESD
ANSI/ESDA/JEDEC JS-001-2012
> ±2000 V on all pins
Machine Model ESD
JESD22-A115CA
> ±200 V on all pins
Charged Device Model ESD
JESD22-C101
> ±500 V on all pins
> ±100 mA or > 1.5 × V(max) on all pins
Part Ordering Information
• LYTSwitch-1 Product Family
• Series Number
• Package Identifier
D
SO-8
• Tape & Reel and Other Options
Blank
LYT 1604 D - TL
TL
Standard Configuration of 100 pcs.
Tape & Reel, 2500 pcs min/mult.
12
Rev. B 07/16
www.power.com
LYT1402-1604
Notes
13
www.power.com
Rev. B 07/16
Revision Notes
Date
A
Code S.
05/16
B
Code A. Updated TBD’s in parameter table. Updated Typical values in UFB(REF), TCC(MAX), IDSS, VOUV parameters. Added Typical
Performance Characteristics and Applications section.
07/16
For the latest updates, visit our website: www.power.com
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does not assume any liability arising from the use of any device or circuit described herein. POWER INTEGRATIONS MAKES NO WARRANTY
HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.
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