LD2417600 [MPD]
LD24;
| 型号： | LD2417600 |
| 厂家： | 
MICROPOWER DIRECT, LLC |
| 描述： | LD24 |
| 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 |
LD24-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
Output
Parameter
Output Voltage Range
Output Current
Output Current Accuracy
Output Power
Conditions
Min.
7.0
Typ.
24
Max.
30.0
40.0
Units
VDC
VDC
• Constant Current Output
• Wide 7V to 30V Input Range
• Efficiency to 95%
0.5 Sec. Max
Internal Capacitor
• Miniature MiniDIP Case
• 150 mA to 1A Output
• Meets EN 60950
Conditions
Min.
2
Typ.
Max.
28
Units
VDC
VIN = 30V
See Model Selection Guide
See Model Selection Guide
See Model Selection Guide
See Model Selection Guide
• 1.6 MHrs MTBF
Efficiency
• Digital & Analog Dimming!
Capacitive Load
Operating Frequency
Ripple & Noise (20 MHz)
Temperature Coefficient
Thermal Impedance
Output Short Circuit
Environmental
47
380
µF
kHz
40
See Model Selection Guide
Models Available
with Wire Leads
(IP67 Rated)
0.03
0.08
+50
%/ºC
ºC/W
Natural Convection
Regulated At Rated Output Current
Parameter
Conditions
Min.
-40
Typ.
+25
Max.
+85
+105
+125
Units
ºC
Ambient
Case
Operating Temperature Range
Storage Temperature Range
Cooling
Humidity
-40
ºC
Free Air Convection
RH, Non-condensing
95
%
Lead Temperature (Solder)
Remote On/Off Control
Parameter
DC/DC On
DC/DC Off
Remote Pin Drive Current
Quiescent Input Current (Shutdown Mode)
PWM Dimming
Parameter
Operation Frequency
Switch On Time
1.5 mm From Case For 10 Sec
260
ºC
Conditions
Min.
Min.
Typ.
Max.
Units
Open or 0.3V < VADJ <1.25V
VADJ <0.15V
VADJ = 1.25V
VIN = 30V
1
25
mA
µA
Conditions
Recommended Maximum
Typ.
Typ.
Max.
1.0
Units
kHz
nS
nS
%
200
200
0.0
Switch Off Time
Output Current Adjustment
Analog Dimming
Parameter
Input Voltage Range
Output Current Adjustment
100
Conditions
Min.
0.0
25
Max.
1.25
100
Units
VDC
%
MicroPower Direct
292 Page Street
Suite D
Stoughton, MA 02072
USA
At VADJ Input
On 0.30
1.25
0.15
1.0
Control Voltage Range Limits
VDC
mA
Off
0.0
Drive Current
VADJ = 1.25V
EMC Compliance
EMI/RFI
Electrostatic Discharge (ESD)
RF Field Susceptibility
Electrical Fast Transients/Bursts On Mains
EMS Immunity
T: (781) 344-8226
F: (781) 344-8481
E: sales@micropowerdirect.com
W: www.micropowerdirect.com
Radiated/Conducted
Class A
EN 55015 (CISPR22)
IEC/EN 61000-4-2, -6, -8
IEC/EN 61000-4-3
IEC/EN 61000-4-4
EN61547
Class A
Class A
Reliability Specifications
Parameter
MTBF
Conditions
MIL HDBK 217F, 25ºC, Gnd Benign
Min.
1.6
Typ.
Max.
Units
MHours
www.micropowerdirect.com
Model Selection Guide
www.micropowerdirect.com
Input
Output
Maximum
Power
(W)
Ripple &
Model
Number
Efficiency Package
(%, Max)
Voltage (VDC) Voltage (VDC)
Current
Accuracy (%)
Noise
(mV P-P, Max)
Range
Range
Max (mA)
150
LD24-04-150
LD24-07-250
LD24-08-300
LD24-08-350
LD24-14-500
LD24-17-600
LD24-20-700
LD24-24-1000
Notes:
7.0 - 30.0
7.0 - 30.0
7.0 - 30.0
7.0 - 30.0
7.0 - 30.0
7.0 - 30.0
7.0 - 30.0
7.0 - 30.0
2.0 - 28.0
2.0 - 28.0
2.0 - 28.0
2.0 - 28.0
2.0 - 28.0
2.0 - 28.0
2.0 - 28.0
2.0 - 28.0
10
8
6
5
6
7
7
7
4.2
7
8
200
200
200
200
250
250
250
300
95
95
95
95
95
95
95
95
14 -Pin DIP
14 -Pin DIP
14 -Pin DIP
14 -Pin DIP
16 -Pin DIP
16 -Pin DIP
16 -Pin DIP
16 -Pin DIP
250
300
350
500
600
700
1,000
8
14
17
20
24
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 3.0SMCJ24A or SMCJ24A is recommended. The TVS max clamping voltage (@max peak pulse
current VC) must be ϹϮ40V. 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-30D-15IS, a compact 30W AC/DC power
supply. The MPM-30D-15IS is connected across its 15 VDC outputs to provide a tightly regulated 30 VDC output at 1A. The 30 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: 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
voltage drops to 1/3 VCC, the discharge pin goes high and C6 begins to charge
again. The formulas for calculating the frequency and duty cycle are included
in the MPD application note “Driving LEDs”.
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. Again, we are
powering the LED driver with the MPM-30D-15IS AC power supply.
The 555 operates over a supply voltage range of 4.5 VDC to 18VDC. Here it is
connected to the 15 VDC output of the SR7805 switching regulator (also driven
by the MPM-20S-24EPB). Care should be taken to minimize ripple at the VCC
input. Excess ripple could cause timing errors.
The diodes (D1 and D2) allow duty cycles below 50% to be set. Diode D1 bypasses
R2 while C6 is charging. Diode D2 is optional (but recommended), essentially block-
ing R2 during the charge period. Theoretically, this circuit will allow for duty cycles
over a range of about 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 C6. The timing capacitor (C6) charges through R1 and D2. When
it reaches the level of 2/3 VCC, the discharge pin (pin 7) goes low and C6 will
discharge through D1 and R2 to the internal discharge transistor. When the C6
The size of C6 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: 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 0.3V 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
The simple analog circuit at left uses the F2506RW,
a 30W, dual 15V output DC/DC converter. Operating
from an input line of 12 VDC, the converter sets the
input to the LED driver at 30 VDC.
The POL regulator, 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 current level of the LED
driver. This level is equal to:
R2
+
V
ADJ
X V
CTRL
=
R1 R2
In the second circuit, the input DC/DC has been changed to
the F2506RU. The 4:1 input of the converter allows for wider
input bus levels (in this case 24 VDC). The POL regulator
is also replaced by the shunt regulator (D1). The regulator,
connected in parallel with the resistor network, will maintain
the voltage across R2 and R3 at 2.5 VDC, insuring that the
1.25 VDC limit on the VADJ pin will not be exceeded.
Analog Output Current Control (7 - 30 VDC IN)
When using the analog control input, the nominal output
current is equal to:
V
1.25
ADJ
I
NOM =IMAX
x
The VADJ input should be left open if not used. Grounding
VADJ will shut the unit down. Connecting VADJ to directly
to +VIN may damage the unit.
Mechanical Dimensions - 16 Pin DIP
Mechanical Dimensions - 14 Pin DIP
Pin Connections - 16 Pin DIP
Pin Connections - 14 Pin DIP
Pin
1
Function
Pin
1
Function
-VIN
-VIN
VADJ
-DC Supply
-DC Supply
PWM, On/Off
9
+LED LED Anode Conn.
+LED LED Anode Conn.
+VIN
+VIN
-VIN
VADJ
-DC Supply
PWM, On/Off
8
14
+LED LED Anode Conn.
+DC Supply
2
3
7
10
15
16
2
+VIN
+DC Supply
+DC Supply
7
-LED LED Cathode Conn.
-LED LED Cathode Conn.
-LED LED Cathode Conn.
8
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) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
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