LD48-34-600 [MPD]
Compact, Wide Input Constant Current DC/DC LED Drivers;
| 型号： | LD48-34-600 |
| 厂家： | 
MICROPOWER DIRECT, LLC |
| 描述： | Compact, Wide Input Constant Current DC/DC LED Drivers |
| 文件： | 总4页 (文件大小：632K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LD48-xx-xxx
Compact, Wide Input
Constant Current
DC/DC LED Drivers
Electrical Specifications
Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice.
Key Features:
Input
Parameter
Input Voltage Range
Max Input Voltage
Input Filter
Conditions
Min.
7.0
Typ.
Max.
60.0
65.0
Units
VDC
VDC
• Constant Current Output
• Wide 7V to 60V Input Range
• Efficiency to 97%
0.5 Sec. Max
Internal Capacitor
Output
• Miniature MiniDIP Case
• ꢀ00 mA to 1A Output
• Meets EN 60950
Parameter
Output Voltage Range
Output Current
Output Current Accuracy
Output Power
Conditions
Min.
2
Typ.
Max.
57
Units
VDC
VIN = 60V
See Model Selection Guide
See Model Selection Guide
See Model Selection Guide
See Model Selection Guide
• 950 kHrs MTBF
Efficiency
• Digital & Analog Dimming!
Capacitive Load
Operating Frequency
Ripple & Noise (20 MHz)
Temperature Coefficient
Thermal Impedance
Output Short Circuit
Environmental
470
500
µF
kHz
20
See Model Selection Guide
Models Available
with Wire Leads
(IP67 Rated)
0.0ꢀ
+ꢀ0
%/ºC
ºC/W
Natural Convection
Regulated At Rated Output Current
Parameter
Conditions
Min.
-40
Typ.
+25
Max.
+85
+110
+125
Units
ºC
Ambient
Case
Operating Temperature Range
Storage Temperature Range
Cooling
Humidity
Lead Temperature (Solder)
Physical
-40
ºC
Free Air Convection
RH, Non-condensing
1.5 mm From Case For 10 Sec
95
260
%
ºC
Case Size
Case Material
Weight
1.25 x 0.80 x 0.49 Inches (ꢀ1.75 x 20.ꢀ2 x 12.45 mm)
Non-Conductive Black Plastic (UL94-V0)
0.622 Oz (17.7g)
Remote On/Off Control
Parameter
Conditions
Min.
Typ.
Max.
Units
DC/DC On
Open or 0.ꢀV < VADJ <1.25V
DC/DC Off
VADJ <0.15V
Remote Pin Drive Current
Quiescent Input Current (Shutdown Mode)
PWM Dimming
Parameter
Operation Frequency
Switch On Time
Switch Off Time
Analog Dimming
Parameter
VADJ = 1.25V
VIN = 60V
1
100
mA
µA
Conditions
Recommended Maximum
Min.
Typ.
Typ.
Max.
1.0
Units
kHz
nS
200
200
nS
MicroPower Direct
292 Page Street
Suite D
Conditions
Min.
0.ꢀ
25
Max.
1.25
100
Units
VDC
%
Input Voltage Range
Output Current Adjustment
At VADJ Input (Pin 4)
Stoughton, MA 02072
USA
On 0.20
Off 0.15
VADJ = 1.25V
0.ꢀ0
0.25
1.0
Control Voltage Range Limits
VDC
mA
Drive Current
EMC Compliance
EMI/RFI
Electrostatic Discharge (ESD)
RF Field Susceptibility
Electrical Fast Transients/Bursts On Mains
EMS Immunity
T: (781) ꢀ44-8226
F: (781) ꢀ44-8481
E: sales@micropowerdirect.com
W: www.micropowerdirect.com
Radiated/Conducted
Class A
EN 55015 (CISPR22)
IEC/EN 61000-4-2, -6, -8
IEC/EN 61000-4-ꢀ
IEC/EN 61000-4-4
EN61547
Class A
Class A
Reliability Specifications
Parameter
MTBF
Conditions
MIL HDBK 217F, 25ºC, Gnd Benign
Min.
950
Typ.
Max.
Units
kHours
www.micropowerdirect.com
Model Selection Guide
www.micropowerdirect.com
Input
Output
Maximum
Power
(W)
Ripple &
Noise
Model
Number
Efficiency
(%, Typ)
Voltage (VDC) Voltage (VDC)
Current
Accuracy (%)
(mV P-P, Max)
Range
Range
Max (mA)
150
LD48-09-150
LD48-14-250
LD48-17-ꢀ00
LD48-20-ꢀ50
LD48-29-500
LD48-ꢀ4-600
LD48-40-700
LD48-48-1000
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
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
8
7
6
5
5
5
5
5
9
14
17
20
29
ꢀ4
40
48
150
200
250
ꢀ00
400
450
500
800
97
97
97
97
97
97
97
97
250
ꢀ00
ꢀ50
500
600
700
1000
Notes:
1. A reversed power source could damage the unit.
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.
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
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) ꢀ44-8226 • FAX: (781) ꢀ44-8481 • E-Mail: sales@micropowerdirect.com
www.micropowerdirect.com
PWM Output Current Control
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:
PWM Control Signals
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.
PWM Dimming Application
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 again. The formulas for calculating the frequency and duty cycle are included
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.
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 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/ꢀ 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/ꢀ VCC, the discharge pin goes high and C4 begins to charge
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) ꢀ44-8226 • FAX: (781) ꢀ44-8481 • E-Mail: sales@micropowerdirect.com
The output current of the unit can also be set by
adjusting the voltage level on the VADJ input to a
value between 0.ꢀV to 1.25V (IOUT will vary from
25% to 100% of rated output current). Care must
be taken not to exceed 1.25V on this input, or
the driver may be damaged.
www.micropowerdirect.com
Analog Output Current Control
A simple analog circuit using two low cost,
switching regulators is shown at left. Work-
ing from inputs that can range from 15 to ꢀ2
VDC,the top regulator (SR1) keeps the input to
the LED driver at 12 VDC.
The other regulator (SR2), driven off the same
input line maintains the control voltage (for the
VADJ input) at 5 VDC. The resister network of R1
and R2 can now be used to set the output cur-
rent level of the LED driver. This level is equal to:
R2
+
V
ADJ
X V
CTRL
=
R1 R2
In the second circuit, the 5 VDC regulator (SR2)
is replaced by the shunt regulator (D1) circuit
connected in parallel with the resistor network.
The regulator will maintain the voltage across R2
and Rꢀ at 2.5 VDC, insuring that the 1.25 VDC
limit on the VADJ pin will not be exceeded. This
circuit will work for inputs between 7VDC and
approximately ꢀ6 VDC. For inputs between ꢀ6
VDC and 60 VDC, a zener diode (D2) has been
added.
Analog Output Current Control (7 - 36 VDC IN)
When using the analog control input, the nominal
output current is equal to:
V
1.25
ADJ
I
NOM =IMAX
x
Analog Output Current Control (36 - 60 VDC IN)
The VADJ input should be left open if not used.
Grounding VADJ will shut the unit down. Connect-
ing VADJ to directly to +VIN may damage the unit.
Mechanical Dimensions
Pin Connections
Pin
Function
2
-VIN
-VIN
VADJ
-DC Supply
ꢀ
-DC Supply
4
PWM, On/Off
9
-LED LED Cathode Conn.
-LED LED Cathode Conn.
11
14 +LED LED Anode Conn.
16 +LED LED Anode Conn.
22
2ꢀ
+VIN
+VIN
+DC Supply
+DC Supply
Notes:
•
•
•
All dimensions are typical in inches (mm)
Tolerance x.xx = 0.02 ( 0.50)
Pin 1 is marked by a “dot” or indentation on the top of the unit
MicroPower Direct
We Power Your Success - For Less!
292 Page Street Ste D Stoughton, MA 02072
•
TEL: (781) ꢀ44-8226
•
FAX: (781) ꢀ44-8481
•
E-Mail: sales@micropowerdirect.com
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