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NSV45020JZのメーカーはON Semiconductorです、この部品の機能は「Adjustable Constant Current Regulator & LED Driver」です。 |
部品番号 | NSV45020JZ |
| |
部品説明 | Adjustable Constant Current Regulator & LED Driver | ||
メーカ | ON Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとNSV45020JZダウンロード(pdfファイル)リンクがあります。 Total 8 pages
NSI45020JZ, NSV45020JZ
Adjustable Constant Current
Regulator & LED Driver
45 V, 20 − 40 mA + 15%, 1.5 W Package
The adjustable constant current regulator (CCR) is a simple,
economical and robust device designed to provide a cost effective
solution for regulating current in LEDs (similar to Constant Current
Diode, CCD). The CCR is based on Self-Biased Transistor (SBT)
technology and regulates current over a wide voltage range. It is
designed with a negative temperature coefficient to protect LEDs from
thermal runaway at extreme voltages and currents.
The CCR turns on immediately and is at 20% of regulation with
only 0.5 V Vak. The Radj pin allows Ireg(SS) to be adjusted to higher
currents by attaching a resistor between Radj (Pin 3) and the Cathode
(Pin 4). The Radj pin can also be left open (No Connect) if no
adjustment is required. It requires no external components allowing it
to be designed as a high or low−side regulator. The high anode-
cathode voltage rating withstands surges common in Automotive,
Industrial and Commercial Signage applications. This device is
available in a thermally robust package and is qualified to stringent
AEC−Q101 standard, which is lead-free RoHS compliant and uses
halogen-free molding compound, and UL94−V0 certified.
Features
• Robust Power Package: 1.5 Watts
• Adjustable up to 40 mA
• Wide Operating Voltage Range
• Immediate Turn-On
• Voltage Surge Suppressing − Protecting LEDs
• AEC−Q101 Qualified and PPAP Capable, UL94−V0 Certified
• SBT (Self−Biased Transistor) Technology
• Negative Temperature Coefficient
• Eliminates Additional Regulation
• NSV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q101
Qualified and PPAP Capable
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Automobile: Chevron Side Mirror Markers, Cluster, Display &
Instrument Backlighting, CHMSL, Map Light
• AC Lighting Panels, Display Signage, Decorative Lighting, Channel
Lettering
• Switch Contact Wetting
• Application Note AND8349/D − Automotive CHMSL
• Application Note AND8391/D − Power Dissipation Considerations
© Semiconductor Components Industries, LLC, 2013
July, 2013 − Rev. 2
1
http://onsemi.com
Ireg(SS) = 20 − 40 mA
@ Vak = 7.5 V
Anode
1
2/4
Cathode
3
Radj
SOT−223
CASE 318E
STYLE 2
MARKING DIAGRAM
C
AYW
AAJG
G
1
A C Radj
A = Assembly Location
Y = Year
W = Work Week
AAJ = Specific Device Code
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping†
NSI45020JZT1G SOT−223 1000/Tape & Reel
(Pb−Free)
NSV45020JZT1G SOT−223 1000/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Publication Order Number:
NSI45020JZ/D
1 Page NSI45020JZ, NSV45020JZ
TYPICAL PERFORMANCE CURVES
Minimum FR−4 @ 300 mm2, 2 oz Copper Trace, Still Air
50 25
40
30
20
10
0
−10
−20
−10
0
TA = 25°C, Radj = Open
10 20 30 40 50 60 70
Vak, ANODE−CATHODE VOLTAGE (V)
Figure 1. General Performance Curve for CCR
22
20
TA = −40°C
−0.0302 mA/°C
−0.0290 mA/°C
15 −0.0278 mA/°C
TA = 25°C
10 TA = 85°C
TA = 125°C
5
Radj = Open
0 DC Test Steady State, Still Air
0 1 2 3 4 5 6 7 8 9 10
Vak, ANODE−CATHODE VOLTAGE (V)
Figure 2. Steady State Current (Ireg(SS)) vs.
Anode−Cathode Voltage (Vak)
24
23
21
22
20
TA = 25°C
21
19
18
17
3.0
Radj = Open
Non−Repetitive Pulse Test
4.0 5.0 6.0 7.0 8.0 9.0
Vak, ANODE−CATHODE VOLTAGE (V)
Figure 3. Pulse Current (Ireg(P)) vs.
Anode−Cathode Voltage (Vak)
10
20
19
18
17
17
Vak @ 7.5 V
TA = 25°C
Radj = Open
18 19 20 21 22 23
Ireg(P), PULSE CURRENT (mA)
Figure 4. Steady State Current vs. Pulse
Current Testing
24
22 40
Vak @ 7.5 V
Vak @ 7.5 V
TA = 25°C
Radj = Open
35
TA = 25°C
21
30
20
19
0 5 10 15 20 25 30 35
TIME (s)
Figure 5. Current Regulation vs. Time
25
20
15
1
10 100
Radj (W), MAX POWER 50 mW
Figure 6. Ireg(SS) vs. Radj
1000
http://onsemi.com
3
3Pages NSI45020JZ, NSV45020JZ
Other Currents
The adjustable CCR can be placed in parallel with any
other CCR to obtain a desired current. The adjustable CCR
provides the ability to adjust the current as LED efficiency
increases to obtain the same light output (Figure 11).
LEDs on and off for a portion of a single cycle. This on/off
cycle is called the Duty cycle (D) and is expressed by the
amount of time the LEDs are on (Ton) divided by the total
time of an on/off cycle (Ts) (Figure 13).
Figure 11.
Dimming using PWM
The dimming of an LED string can be easily achieved by
placing a BJT in series with the CCR (Figure 12).
Figure 12.
The method of pulsing the current through the LEDs is
known as Pulse Width Modulation (PWM) and has become
the preferred method of changing the light level. LEDs being
a silicon device, turn on and off rapidly in response to the
current through them being turned on and off. The switching
time is in the order of 100 nanoseconds, this equates to a
maximum frequency of 10 Mhz, and applications will
typically operate from a 100 Hz to 100 kHz. Below 100 Hz
the human eye will detect a flicker from the light emitted
from the LEDs. Between 500 Hz and 20 kHz the circuit may
generate audible sound. Dimming is achieved by turning the
Figure 13.
The current through the LEDs is constant during the period
they are turned on resulting in the light being consistent with
no shift in chromaticity (color). The brightness is in proportion
to the percentage of time that the LEDs are turned on.
Figure 14 is a typical response of Luminance vs Duty Cycle.
6000
5000
4000
3000
2000
1000
Lux
Linear
00 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
Figure 14. Luminous Emmitance vs. Duty Cycle
Reducing EMI
Designers creating circuits switching medium to high
currents need to be concerned about Electromagnetic
Interference (EMI). The LEDs and the CCR switch
extremely fast, less than 100 nanoseconds. To help eliminate
EMI, a capacitor can be added to the circuit across R2.
(Figure 12) This will cause the slope on the rising and falling
edge on the current through the circuit to be extended. The
slope of the CCR on/off current can be controlled by the
values of R1 and C1.
The selected delay / slope will impact the frequency that
is selected to operate the dimming circuit. The longer the
delay, the lower the frequency will be. The delay time should
not be less than a 10:1 ratio of the minimum on time. The
frequency is also impacted by the resolution and dimming
steps that are required. With a delay of 1.5 microseconds on
the rise and the fall edges, the minimum on time would be
30 microseconds. If the design called for a resolution of 100
dimming steps, then a total duty cycle time (Ts) of 3
milliseconds or a frequency of 333 Hz will be required.
http://onsemi.com
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部品番号 | 部品説明 | メーカ |
NSV45020JZ | Adjustable Constant Current Regulator & LED Driver | ON Semiconductor |