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NTE7208 Datasheet Preview

NTE7208 Datasheet

Integrated Circuit Constant Current Single Output LED Driver

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NTE7208
Integrated Circuit
Constant Current Single Output LED Driver
Description:
The NTE7208 is a step-down constant current source designed for driving high power white LEDs.
A standard output current of 350mA makes this driver compatible with a wide range of LEDs from
many different manufacturers without the need for any external components. Despite its compact
size, the NTE7208 is fully featured with very high efficiency, wide input voltage range, high ambient
operating temperature and two means of LED dimming: PWM/digital control and analog voltage dim‐
ming. Both dimming controls are independent and can be combined. The driver is also designed to
be as reliable as the LEDs it is driving, even at the full operating temperature of +85°C.
Features:
D Constant Current Output
D Power LED Driver
D Wide Input Voltage Range
D PWM/Digital Dimming and Analog Voltage Dimming
D Short Circuit Protected
D 96% Efficiency
Electrical Specifications: (Typical at TA = +25°C, nominal input voltage, rated output current unless
otherwise specified.
Input Voltage (Absolute Maximum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V
Recommended Input Voltage
Minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24V
Maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V
Input Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Capacitor
Output Voltage Range (Vin = 36V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2V to 32V
Output Current Range (Vin - Vout > 1.5V to 4V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350mA
Typical Output Current Accuracy (IO = 350mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±2%
Internal Power Dissipation, (Load of 5 LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700mW
Maximum Output Current Stability (Vin = 36V, Vout =2V to 32V) . . . . . . . . . . . . . . . . . . . . . . . . . . ±1%
Maximum Output Ripple and Noise, (20MHz limited, Vin = 36V, Vout = 2V to 32V) . . . . . 120mVp-p
Maximum Temperature Coefficient (TA = -40° to +85°C) . . . . . . . . . . . . . . . . . . . . . . . . . ±0.015%/ °C
Maximum Capacitive Load, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100μF
Operating Frequency
Minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210kHz
Typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260kHz
Maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300kHz
Maximum Effieciency at Full Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96%
Short Circuit Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Regulated at Rated Output Current
Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +85°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55° to +125°C




NTE

NTE7208 Datasheet Preview

NTE7208 Datasheet

Integrated Circuit Constant Current Single Output LED Driver

No Preview Available !

Electrical Specifications (Cont'd): (Typical at TA = +25°C, nominal input voltage, rated output current
unless otherwise specified.
Maximum Case Tempeature, TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +100°C
Thermal Impedance (Nature Convection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +55°C/W
Case Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Non Conductive Black Plastic
Potting Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Epoxy (UL94-V0)
Maximum Wave Soldering Profile (10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +235°C
PWM Dimming and ON/OFF Control (Leave Open if Not Used):
Remote ON/OFF
DC/DC ON, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Open or 0V < Vr < 0.6V
DC/DC OFF (Standby) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 < Vr < 2.9V
DC/DC OFF (Shutdown), . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 < Vr < 6V
Maximum Remote Pin Drive Current (Vr = 5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA
Maximum Quiescent Input Current in Shutdown Mode (Vin = 36V, Vr > 2.9V) . . . . . . . . . . . . 200μA
Maximum PWM Frequency for Linear Operation (measured 10% to 90% Dimming) . . . . . . . 200Hz
Analog Dimming Control (Leave Open if Not Used):
Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 15V
Control Voltage Range Limits
Full On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.13V ± 50mV
Full Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5V ± 50mV
Maximum Analog Pin Drive Current (Vc = 5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2mA
Environmental:
Relative Humidity (See Note) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5% to 95% RH, non-condensing
Conducted Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EN55022, Class B
Radiated Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EN55022, Class B
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EN61000-4-2, Class A
Radiated Immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EN61000-4-3, Class A
Fast Transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EN61000-4-4, Class A
Conducted Immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EN61000-4-6, Class A
MTBF
(RCD-24-0.70, Nominal Vin,
+25°C . . . . . . . . . . . . . . . . . . .
Full Load)
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605
x
103
hours
Using MIL-HDBK 217F, +71°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 516 x 103 hours
Note: Requires an input filter to meet EN55022 Class B conducted emissions, see below.
Class B Filter Suggestion
+Vin
47μH (not dimmed)
or
120μH (dimmed)
1
6 +LED
2.5μF
Elect.
10nF
Cer.
-Vin
10nF, Cer.
(only if Analog Dimming is not used)
10nF, Cer.
(only if Analog Dimming is used)
NTE7208
LED Driver
4
2
C1 or C2
5
-LED


Part Number NTE7208
Description Integrated Circuit Constant Current Single Output LED Driver
Maker NTE
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NTE7208 Datasheet PDF






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