DFN3030D-8 データシートの表示（PDF） - Diodes Incorporated.
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DFN3030D-8 Datasheet PDF : 7 Pages
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DLD101
0.7
0.6
IC/IB = 10
Q2 Typical Performance Curves - continued
0.5
0.4
0.3
0.2
TA = 125°C TA = 150°C
0.1
0
1
TA = 85°C
TA = -55°C TA = 25°C
10
100 200
IC, COLLECTOR CURRENT (mA)
Fig. 11 Typical Collector-Emitter Saturation Voltage
vs. Collector Current
Typical Application Circuit
VCC Supply
RC
LED String
The DLD101 has been designed primarily for solid state lighting
applications, to be used as a current sink circuit solution for LEDs. It
features a N-channel MOSFET capable of 1A drive current and a pre-
biased NPN transistor (which allows direct connection to the base, or
via a series base resistor).
43
2
1
GD
C
Q2
B
R2
E
R1
VDS
Q1
S
56 7 8
Option 3
Option 2
Option 1
RS
Option 3:
ILED
≈
VBE
RS
Options 1 & 2:
ILED ≈
1.1 VBE
RS
Option 2:
Capacitor is across R2 for
better noise performance.
Fig. 12 Typical Application Circuit for
Linear Mode Current Sink LED Driver
Figure 12 shows a typical application circuit diagram for driving an
LED or string of LEDs. Note that the pre-biased transistor (Q2) has
the option of bypassing the series base resistor by connecting directly
to pin 7. The N-MOSFET (Q1) is configured as a VBE referenced
current sink and is biased on by RC. The current passed through the
LED string, MOSFET and source resistor, develops a voltage across
RS that provides a bias to the NPN transistor. Consideration of the
expected linear mode power dissipation must be factored into the
design, with respect to the DLD101's thermal resistance.
VDS = VCC – VF LED String – VRS
PQ1 = VDS * ILED String
PWM dimming functionality can be effected by either driving the NPN
base via an additional resistor (thereby overriding the feedback from
RS) or by pulling the gate of the MOSFET down by direct connection.
The PWM control pulse stream can be provided by a micro-controller
or simple 555 based circuitry.
DLD101
Document number: DS32007 Rev. 6 - 2
5 of 7
www.diodes.com
February 2010
© Diodes Incorporated
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