DataSheet26.com

LD48-20-350W PDF даташит

Спецификация LD48-20-350W изготовлена ​​​​«MicroPower Direct» и имеет функцию, называемую «Wired Constant Current DC/DC LED Drivers».

Детали детали

Номер произв LD48-20-350W
Описание Wired Constant Current DC/DC LED Drivers
Производители MicroPower Direct
логотип MicroPower Direct логотип 

4 Pages
scroll

No Preview Available !

LD48-20-350W Даташит, Описание, Даташиты
LD48-xx-xxW
Compact, Wired
Constant Current
DC/DC LED Drivers
Electrical Specifications
Key Features:
Constant Current Output
Wide 7V to 60V Input Range
Efficiency to 97%
Miniature MiniDIP Case
IP67 Rated
Meets EN 60950
950 kHrs MTBF
Digital & Analog Dimming!
Board Mount
Models
Available
IP67
MicroPower Direct
292 Page Street
Suite D
Stoughton, MA 02072
USA
T: (781) 344-8226
F: (781) 344-8481
W: www.micropowerdirect.com
Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice.
Input
Parameter
Conditions
Min. Typ. Max. Units
Input Voltage Range
7.0 60.0 VDC
Max Input Voltage
0.5 Sec. Max
65.0 VDC
Input Filter
Internal Capacitor
Output
Parameter
Conditions
Min. Typ. Max. Units
Output Voltage Range
VIN = 60V 2
57 VDC
Output Current
See Model Selection Guide
Output Current Accuracy
See Model Selection Guide
Output Power
See Model Selection Guide
Efficiency
See Model Selection Guide
Capacitive Load
470 µF
Operating Frequency
20 500 kHz
Ripple & Noise (20 MHz)
See Model Selection Guide
Temperature Coefficient
±0.03 %/ºC
Thermal Impedance
Natural Convection
+30 ºC/W
Output Short Circuit
Regulated At Rated Output Current
Environmental
Parameter
Conditions
Min. Typ. Max. Units
Operating Temperature Range
Storage Temperature Range
www.DataSheet.net/
Ambient
Case
-40
-40
+25 +85
+110
+125
ºC
ºC
Cooling
Free Air Convection
Humidity
RH, Non-condensing
95 %
Lead Temperature (Solder)
1.5 mm From Case For 10 Sec
260 ºC
Physical
Case Size
1.25 x 0.80 x 0.49 Inches (31.75 x 20.32 x 12.45 mm)
Case Material
Non-Conductive Black Plastic (UL94-V0)
Weight
0.622 Oz (17.7g)
Remote On/Off Control
Parameter
Conditions
Min. Typ. Max. Units
DC/DC On
Open or 0.3V < VADJ <1.25V
DC/DC Off
VADJ <0.15V
Remote Pin Drive Current
VADJ = 1.25V
1 mA
Quiescent Input Current (Shutdown Mode)
VIN = 60V
100 µA
PWM Dimming
Parameter
Conditions
Min. Typ. Max. Units
Operation Frequency
Recommended Maximum
1.0 kHz
Switch On Time
200 nS
Switch Off Time
200 nS
Analog Dimming
Parameter
Conditions
Min. Typ. Max. Units
Input Voltage Range
At VADJ Input (Pin 4) 0.3
1.25 VDC
Output Current Adjustment
25 100 %
Control Voltage Range Limits
On 0.20
Off 0.15
0.30
0.25
VDC
Drive Current
VADJ = 1.25V
1.0 mA
EMC Compliance
EMI/RFI
Radiated/Conducted
EN 55015 (CISPR22)
Electrostatic Discharge (ESD)
Class A
IEC/EN 61000-4-2, -6, -8
RF Field Susceptibility
Class A
IEC/EN 61000-4-3
Electrical Fast Transients/Bursts On Mains
Class A
IEC/EN 61000-4-4
EMS Immunity
EN61547
Reliability Specifications
Parameter
Conditions
Min. Typ. Max. Units
MTBF
MIL HDBK 217F, 25ºC, Gnd Benign 950
kHours
www.micropowerdirect.com
Datasheet pdf - http://www.DataSheet4U.co.kr/









No Preview Available !

LD48-20-350W Даташит, Описание, Даташиты
Model Selection Guide
www.micropowerdirect.com
Model
Number
LD48-09-150W(A)
LD48-14-250W(A)
LD48-17-300W(A)
LD48-20-350W(A)
LD48-29-500W(A)
LD48-34-600W(A)
LD48-40-700W(A)
LD48-48-1000W(A)
Input
Voltage (VDC)
Range
7.0 - 60.0
7.0 - 60.0
7.0 - 60.0
7.0 - 60.0
7.0 - 60.0
7.0 - 60.0
7.0 - 60.0
7.0 - 60.0
Voltage (VDC)
Range
2.0 - 57.0
2.0 - 57.0
2.0 - 57.0
2.0 - 57.0
2.0 - 57.0
2.0 - 57.0
2.0 - 57.0
2.0 - 57.0
Output
Current
Max (mA) Accuracy (%)
150 ±8
250 ±7
300 ±6
350 ±5
500 ±5
600 ±5
700 ±5
1000
±5
Maximum
Power
(W)
9
14
17
20
29
34
40
48
Ripple &
Noise
(mV P-P, Max)
150
200
250
300
400
450
500
800
Efficiency
(%, Typ)
97
97
97
97
97
97
97
97
Notes:
1. A reversed power source could damage the unit.
2. No connection should be made between input ground and the output.
3. These are step-down devices, the maximum output open voltage is
equal to the input voltage.
Typical Connection: DC/DC Input
4. The VADJ input should be left open if not used. Grounding VADJ will shut the unit
down. Connecting VADJ to VIN may damage the unit.
5. Exceeding the specified maximum output power could cause damage to the unit.
www.DataSheet.net/
Connection Notes:
To comply with EN61000-4-5, a TVS should be installed before the input filter components. A 3.0SMCJ48A or SMCJ48A is recommended. The TVS max clamping voltage (@max peak pulse
current VC) must be ϹϮ60V. This will prevent any surge from exceeding the maximum input of the driver (65 VDC). Exceeding the maximum input rating could damage the driver.
The filter shown (C1, C2 and L1) will help to meet conducted emission requirements. With the addition of the filter, the unit should meet the levels of EN 55015.
Typical Connection: AC/DC Input
Connection Notes:
This is a distributed (or two-stage) AC connection. In this configuration, the AC line in (90 to 264 VAC) is connected to the MPM-04S-12, a miniature 4W AC/DC power
supply. The MPM-04S-12 provides a tightly regulated 12 VDC output at 333 mA. The 12 VDC output powers the LED driver.
The two stage approach can simplify the safety approval process (most AC/DC power supplies on the market are approved to EN 60950) and may increase design flex-
ibility. Besides the output power, other specifications to consider when selecting the input AC/DC supply would include input range, safety approvals, PFC rating (which
may be needed for various system energy ratings) and operating temperature range.
Note: The output current adjustment circuit shown in both connection diagrams is discussed on page 4.
292 Page Street Ste D Stoughton, MA 02072 TEL: (781) 344-8226 FAX: (781) 344-8481 E-Mail: [email protected]
Datasheet pdf - http://www.DataSheet4U.co.kr/









No Preview Available !

LD48-20-350W Даташит, Описание, Даташиты
PWM Output Current Control
PWM Control Signals
PWM Dimming Application
www.micropowerdirect.com
An LED operates at its maximum efficiency when
operated at the rated drive current specified by
the manufacturer. Operating an LED at lower than
its rated forward current not only decreases the
system efficiency; but may cause color (or wave-
length) shifting. In illumination applications, this
could cause visible changes to lighting.
A preferred method is using pulse width modula-
tion (PWM). As shown at left, the output current
is adjusted by applying a PWM signal to the VADJ
input. By varying the signal duty cycle the average
output current is adjusted up or down. To avoid
visible flicker, the PWM signal should be greater
than 100 Hz.
For duty cycles (DPWM) between 0 and 1, the
output current is derived by the formula:
INOM = IMAX X DPWM
The VADJ input may be driven via an open collec-
tor transistor (as shown). The diode and resistor
suppress high amplitude negative spikes that may
be caused by the drain-source capacitance of the
transistor. Negative spikes on the control input of
the unit could cause errors in output current or
erratic operation.
The VADJ input can also be driven by the open drain
output of a microcontroller. Again, any high amplitude
negative spikes that may be caused by the drain-
source capacitance of the FET must be supressed.
www.DataSheet.net/
Get a full explanation
of this circuit in “Driving LEDs”.
Available free at the MPD website
A simple method of achieving digital (or PWM) dimming is by using a 555 timer
to apply a series of pulses to the VADJ input, as illustrated above. The 555 oper-
ates over a supply voltage range of 4.5 VDC to 15VDC. Here it is connected
to the 12 VDC output of the SR7805 switching regulator (this is also the VIN
of the LED driver). Care should be taken to minimize ripple at the VCC input.
Excess ripple could cause timing errors.
The timer is connected for astable (free run) operation. The frequency is set
by R1, R2 and C4. The timing capacitor (C4) charges through R1 and D2. When
it reaches the level of 2/3 VCC, the discharge pin (pin 7) goes low and C4 will
discharge through D1 and R2 to the internal discharge transistor. When the C4
voltage drops to 1/3 VCC, the discharge pin goes high and C4 begins to charge
again. The formulas for calculating the frequency and duty cycle are included
in the MPD application note “Driving LEDs”.
The diodes (D1 and D2) allow duty cycles below 50% to be set. Diode D1
bypasses R2 while C4 is charging. Diode D2 is optional (but recommended),
essentially blocking R2 during the charge period. Theoretically, this circuit will
allow for duty cycles over a range of approximately 5% to 95%. If manual
adjustment is desired, a potentiometer may be substituted for R2 (with some
adjustment of the circuit).
The size of C4 is generally not critical, but it should be as low leakage as pos-
sible. In order to avoid excessive current flow through the internal discharge
transistor, it is recommended that R1 be at least 5 k.
MicroPower Direct 292 Page Street Ste D Stoughton, MA 02072 TEL: (781) 344-8226 FAX: (781) 344-8481 E-Mail: [email protected]
Datasheet pdf - http://www.DataSheet4U.co.kr/










Скачать PDF:

[ LD48-20-350W.PDF Даташит ]

Номер в каталогеОписаниеПроизводители
LD48-20-350WWired Constant Current DC/DC LED DriversMicroPower Direct
MicroPower Direct

Номер в каталоге Описание Производители
TL431

100 мА, регулируемый прецизионный шунтирующий регулятор

Unisonic Technologies
Unisonic Technologies
IRF840

8 А, 500 В, N-канальный МОП-транзистор

Vishay
Vishay
LM317

Линейный стабилизатор напряжения, 1,5 А

STMicroelectronics
STMicroelectronics

DataSheet26.com    |    2020    |

  Контакты    |    Поиск