ZLED7010 Datasheet, PDF (1/22 Pages) List of Unclassifed Manufacturers – 40V LED Driver with Temperature Compensation

40V LED Driver with
Temperature Compensation
ZLED7010
Datasheet
Brief Description
The ZLED7010, one of our ZLED Family of LED control
ICs, is an inductive step-down converter that is optimal
for driving a single LED or multiple LEDs (connected in
series) from a voltage source greater than the voltage
rating of the LED. The ZLED7010 operates in continu-
ous mode. Capable of operating efficiently with voltage
supplies ranging from 6 VDC to 40 VDC, it is ideal for
low-voltage lighting applications. The ZLED7010 mini-
mizes current consumption by remaining in a low-current
standby mode (output is off) until a voltage of ≥0.3V is
applied to the ADJI pin.
In operating mode, the ZLED7010 can source LEDs with
an output current of ≤ 750mA (≤ 30 watts of output
power*) that is externally adjustable. The ZLED7010’s
integrated output switch and high-side current sensing
circuit use an external resistor to adjust the average out-
put current. LED control is achieved via an external con-
trol signal at the ZLED7010’s ADJI pin, implemented as
a pulse-width modulation (PWM) waveform for a gated
output current or a DC voltage for continuous current.
The ZLED7010 provides a temperature compen-
sation function for maintaining stable and reliable
LED operation. LED over-temperature conditions
are detected via a negative temperature coefficient
(NTC) thermistor mounted close to the LEDs. If an
over-temperature condition occurs, the NTC value
reaches the value of a threshold resistor and the
IC reduces LED current automatically. After the
circuit recovers to a safe temperature, current
returns to the set value.
ADJ_O outputs and ADJ_I inputs of consecutive ICs
can be interconnected as a driver chain deploying
the temperature compensation information of the
predecessor. This reduces the part count because
only the first stage of the series requires an NTC.
6 to 40 VDC
R_S
V_S
Features
• Capable of 95% efficiency*
• Operates in continuous mode with a wide input
range from 6 VDC to 40 VDC
• Integrated 40V power switch
• One-pin on/off or brightness control via DC voltage
or PWM control signal
• Switching frequency: ≤ 1MHz
• Dimming rate: 1200:1 (typical)
• Output current accuracy: 5% (typical)
• Built-in temperature compensation and open-circuit
protection for LEDs
• Thermal shutdown protection for the ZLED7010
• Very few external components needed for operation
• Broad range of applications: outputs up to ≤750mA
• SOP-8 package
Application Examples
• Illuminated LED signs and other displays
• LED traffic and street lighting (low-voltage)
• Architectural LED lighting, including low-voltage
applications for buildings
• Halogen replacement LEDs (low-voltage)
• LED flood-lighting
• LED backlighting
• General purpose exterior and interior LED lighting,
including applications requiring low-voltage
• General purpose low-voltage industrial applications
ZLED7010 Application Circuit
C1
1μF
C2 R2
100nF 50kΩ
1
D1 ₂
V_IN
4 _RNTC
I_SENSE
3 _RTH ZLED7010 _LX 8
6
ADJ_I
5
GND ^ADJO
7
n LED
L1
47μH
R3
NTC
* See section 2.3 and 1.4 for details
© 2016 Integrated Device Technology, Inc.
1
April 20, 2016