NJM2392M Nisshinbo

NJM2392 PWM DC/DC Converter IC GENERAL DESCRIPTION PACKAGE OUTLINE The NJM2392 is a PWM DC/DC converter IC. It features fixed frequency type PWM control for better noise handling and to avoid intermittent oscillation observed in a simplified controller. It is suitable for Step-Up, Step-Down and Inverting applications. In addition, it contains a pulse-by-pulse current limit circuit NJM2392D NJM2392M and can be set by an external resistance. FEATURES Operating Voltage 3.0V to 40V Wide Oscillator Frequency 1kHz to 150kHz Internal High Power Transistor 1.5A max. Internal Over Current Limit Circuit PWM switching control Bipolar Technology Package Outline NJM2392D : DIP8 NJM2392M : DMP8 PIN CONFIGURATION BLOCK DIAGRAM PIN FUNCTION 1 8 C 1 8 C S D Q R 1. C S PWM 2 7 2. E S Logic 1.5A 3. C T S 3 6 4. GND 160 5. IN- + 4 5 E 2 7 S 6. V S I 7. S I OSC Block 8. C D MAX NJM2392D ON Duty Ipk Sense NJM2392M 9:1 300mV + C 3 6 V T Error AMP PWM COMP Vref 1.25V GND 4 5 IN- Buffer Ver.2008-08-29 - 1 - NJM2392 ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL MAXIMUM RATINGS UNIT + Maximum Supply Voltage V 40 V Comparator Input Voltage V -0.3 ~ 40 (note) V IR Output Driver Voltage V(driver) 40 V C Output Switch Voltage V 40 V SW Output Driver Current I(driver) 100 mA C Output Switch Current I 1.5 A SW DIP8 875 Power Dissipation P DMP8 580 (*1) mW D 750 (*2) Operating Temperature Range Topr -40 ~ +85 C Storage Temperature Range Tstg -50 ~ +150 C (note) When supply voltage is less than 40V, the absolute maximum input voltage is equal to the supply voltage. (*1) At on PC board : 114.3mm 76.2mm 1.6mm(2 layer FR-4) : Conform to EIA/JEDEC (*2) At on PC board :114.3mm 76.2mm 1.6mm(4 layer FR-4) : Conform to EIA/JEDEC POWER DISSIPATION vs. AMBIENT TEMPERATURE Power Dissipation vs. Ambient Temperature o o (Topr=-40~+85 C, Tj= ~150 C) 1000 DIP8 800 600 400 DMP8 At on 4 layer PC Board 200 At on 2 layer PC Board 0 025 50 75 100 o Ambient Temperature Ta ( C) Ver.2008-08-29 - 2 - Power Dissipation P (mW) D