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NJU7620

JRC
Part Number NJU7620
Manufacturer JRC
Description Step-Up/Flyback Switching Regulator IC
Published Jun 12, 2009
Detailed Description NJU7620 Step-Up/Flyback Switching Regulator IC with Constant Current Control ■ GENERAL DESCRIPTION The NJU7620 is a lo...
Datasheet PDF File NJU7620 PDF File

NJU7620
NJU7620

Overview
NJU7620 Step-Up/Flyback Switching Regulator IC with Constant Current Control ■ GENERAL DESCRIPTION The NJU7620 is a low voltage operation high-speed switching regulator control IC for step-up and flyback converter, with a constant current control.
It incorporates a totem pole output, which can drive an external MOS-FET easily.
It also incorporates error amplifier and current sense amplifier, which can allow the constant voltage/current control for output voltage.
Therefore the NJU7620 is suitable for a LED driving and other CCCV applications up to 10W.
The NJU7620 is available in a small and thin 8-lead MSOP (TVSP) package.
■ FEATURES ● PWM switching control ● Constant Current Control ● Operating Voltage 2.
2V to 8V ● Wide Oscillator Range 300kHz to 1MHz ● Maximum Duty Cycle 90% typ.
● Quiescent Current 800µA typ.
● Soft-Start Function Internal : 16ms typ.
or adjustable ● Dead Time Control ● C-MOS Technology ● Package Outline NJU7620RB1 : MSOP8 (TVSP8)* *MEET JEDEC MO-187-DA / THIN TYPE ■ PACKAGE OUTLINE NJU7620RB1 (MSOP8 (TVSP8)) ■ PRODUCT VARIATION NJU7620 Constant Current Control NJU7610 Over Current Protection NJU7600 PWM Control ■PIN CONFIGURATION 1 2 3 4 NJU7620RB1 8 7 6 5 PIN FUNCTION 1.
V+ 2.
FB 3.
IN-1 4.
IN-2 5.
DTC 6.
RT 7.
GND 8.
OUT Ver.
2012-08-03 -1- NJU7620 ■ BLOCK DIAGRAM V+ FB IN-1 1V Error AMP −1 IN-2 0.
2V −1 Current Sense AMP 0.
8V 0.
2V Soft Start UVLO 0.
5 RT A OSC 0.
5V PW M Buffer OUT 0.
74V DTC RT RT GND -2- Ver.
2012-08-03 NJU7620 ■ ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Output Pin Current Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL V+ IO PD TOPR TSTG MAXIMUM RATINGS +9 ±50 MSOP8 (TVSP8) :320 -40 to +85 -40 to +125 (Ta=25°C) UNIT V mA mW °C °C ■ RECOMMENDED OPERATING CONDITIONS PARAMETER Operating Voltage Oscillator Timing Resistor Oscillation Frequency SYMBOL V+ RT fOSC MIN.
2.
2 30 300 (Ta=25°C) TYP.
MAX.
UNIT –8V 47 120 kΩ 700 1,000 kHz ■ ELECT...


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