NTE1503 Integrated Circuit 5-Step LED Driver Circuit for Logarithmic Response
Description: The NTE1503 is an integrated circuit in a 9-Lead SIP type package designed for driving 5-LED bar graphs or dot displays so that the LEDs may light logarithmically (dB) for input signal. Brightness of the LEDs can be controlled by using the output current adjustment pin provided. Features: D 5-LED Bar Graph or Dot Display Drive D Logarithmic Response with Respect to Input D Brightness Externally Adjustable D High Output Current, Suitable for Green LED Drive D Lamp ON/OFF Hysteresis, No Flickering by Noise Absolute Maximum Ratings: (TA = +25C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +18V Circuit Voltage, V8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +16V Load Current Set Input Voltage, V7-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +16V Output Voltage (Note 1), VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +16V Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18mA Load Current Set Input Current, I7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.25mA Output Current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550mW Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to +75C Storage Temperatuere Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150C Note 1. Output Pin1, Pin2, Pin3, Pin4, and Pin6. Electrical Characteristics: (TA = +25C, VCC = 16V unless otherwise specified)
Parameter Input Voltage (LED ON) LED 1 LED 2 LED 3 LED 4 LED 5 Symbol VI(ON)1 VI(ON)2 VI(ON)3 VI(ON)4 VI(ON)5 Test Conditions Min - - - - - Typ - - - - - Max 1.12 1.86 3.10 5.18 8.66 Unit V V V V V
Electrical Characteristics (Cont'd): (TA = +25C, VCC = 16V unless otherwise specified)
Parameter Input Voltage (LED OFF) LED 1 LED 2 LED 3 LED 4 LED 5 Load Current Pin6 Pin1 to Pin4 Pin1 to Pin4, Pin6 Input Current Symbol VI(OFF)1 VI(OFF)2 VI(OFF)3 VI(OFF)4 VI(OFF)5 I6 I1 to I4 I1 to I4, I6 I8 I9 I1 to I4, I6 VO = 1.2V, I7 = 4.25mA VO = 2.5V, I7 = 4.25mA VO = 16V, I7 = 4.25mA V8-5 = 8.7V V8-5 = 16V Supply Current Output Pin Leakage Current V8-5 = 16V VO = 16V Pin Connection Diagram (Front View) 9 8 7 6 5 4 3 2 1 VCC Input Output Current Adjust LED 5 GND LED 4 LED 3 LED 2 LED 1 Test Conditions Min 0.80 1.49 2.54 4.28 7.23 13 13 - - - - - Typ - - - - - 16 16 16 - - - - Max - - - - - - - 19 50 5 18 15 Unit V V V V V mA mA mA A mA mA A
.929 (23.6)
.118 (3.0)
.236 (6.0) 1 9 .098 (2.5)
.100 (2.54)
.118(3.0)
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