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ZLED7X20 Family
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General Documents & Supporting Materials: 
ZLED7x20 Family Data Sheet Rev. 1.2ZLED7x20 Family Feature Sheet Rev. 1.2
Brief Description
The ZLED7x20 continuous-mode inductive step-down converter family (ZLED7020, ZLED7320, ZLED7520, ZLED7720) is part of our line of LED-control ICs. It is designed for applications requiring high brightness and high current. It can efficiently drive a single LED or multiple series-connected LEDs from a voltage input higher than the LED forward voltage: Vin = 6 to 40 VDC. It provides an adjustable output current ≤1.2A, which is set via an external resistor and controlled by the ZLED7x20’s integrated high-side output current-sensing circuit and high speed internal 40V power switch. An external control signal, which can be a DC voltage, PWM, or microcontroller-generated waveform, on the ADJ pin can also be used to linearly adjust a continuous output current or to control a gated output current.
The output can be turned off by applying a voltage lower than 0.2V to the ADJ pin, which puts the ZLED7x20 in a low-current standby state.
The ZLED7x20 enables diverse industrial and consumer lighting applications requiring high driving currents, wide operating voltage range, high efficiency, and variable brightness control. It offers over-temperature and LED open-circuit protection. The ZLED7x20 can also minimize bill-of-material costs because very few external components are required for most applications. Only a resistor, a diode, an inductor, and three capacitors are needed for a typical basic application.
For easy evaluation of the ZSC7020, ZMDI offers the ZSC7020 Demo Kit, which includes a cascadable test board including one 5W white High Brightness LED, 5 ZLED7020 samples in SOT89-5 package and documentation. Order using part number ZLED7020KIT-D1. Additional unpopulated cascadable test boards are also available. This kit can be used to simulate the behavior of the ZLED7320, ZLED7520, ZLED7720 by changing resistor values that control the maximum current output.
Features
Up to 1.2A output current
Internal 40V power switch
Wide DC input voltage range 6 to 40 VDC
Output current accuracy: 3% (typical)
Dimming ratio: 1200:1
LED open-circuit protection
Thermal shutdown protection
Benefits
High efficiency: up to 98%
Single pin on/off and brightness control using DC voltage or PWM
Very few external components needed for operation
Footprint compatible to our ZLED7000 depending on application
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