N2576 ETC2
Document overview
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Technical content
52 KHz 3A Step-Down
Switching Voltage Regulator (SVR) N2576 TO-263, TO220 MAY-31-2001 NIKO-SEM GENERAL DESCRIPTION The N2576 Series switching voltage regulators (SVR) are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, Both series are capable of driving
3 A load respectively with excellent line and
load regulation. The N2576 Series SVR include a switching regulator and compensation network all within the same package. Just add a choke, catch diode and two capacitors to obtain an efficient DC-to-DC converter. The output switch includes cycle-by-cycle current limit -ing, as well as thermal shutdown for full protection under fault conditions. The N2576 Series SVR offer replacement for popular 3 terminal linear regulators by providing higher efficiency with reduced heat sink size. In many applications a heat sink will not be required.
FEATURES
z Pin compatible with industry products of LM2576 Series z Adjustable output versions z Wide output voltage range, 1.23V to 27V for adjustable output version z DC-to-DC buck converter requiring only 4 external parts z 52 KHz fixed frequency internal oscillator z TTL shutdown capability, low power stand -by mode z High efficiency z Uses readily available standard inductors
APPLICATIONS
z Simple high-efficiency step-down (buck) regulator z Positive to negative converter (Inverting Buck-Boost) z Isolated Fly back Converter using mini- mum number of external parts z Powering portable instrument, Set-Top Box, LCD Monitor, Scanner, I.A, Easy PC z SMPS Post-Regulator TYPICAL APPLICATION * V OUT = 1.23V ( 1 + R1 / R2) Adjustable Regulator in Fixed Output Application + +Cin Cout N2576 +Vin Output Gnd Feedback On/Of f 8V - 27V DC Input Unregulated 100uF 1N5822 100uH 1000uF 6.18K Output +5V, 3A Regulated
Switching Voltage Regulator (SVR) N2576 TO-263, TO220 MAY-31-2001 NIKO-SEM ABSOLUTE MAXIMUM RATINGS z Maximum Supply Voltage 30V z ON/OFF Pin Input Voltage -0.3≤V≤+VI z Thermal Resistance Junction to Ambient, θJA TO-220 TO-263 50°C/W 60°C/W z Output Voltage to Ground (Stead State) -1V z Operating Junction Temperature Range -40 to 125°C z Power Dissipation Internally Limited z Storage Temperature Range -65 to 150°C z Thermal Resistance Junction to Case, θ JC 2.0°C/W z Lead Temperature (Soldering, 10 Seconds) 260°C ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25°C.) Parameter Symbol Test Conditions Typical Limits Feedback Voltage VOUT VIN = 12V, VOUT = 5V ILOAD = 0.5A (N2576) 1.230V 1.217VMin 1.243VMax Feedback Voltage VOUT 8V ≤ VIN ≤ 27V 0.5A ≤ ILOAD ≤ 3A (N2576) 1.230V 1.193VMin 1.267VMax Efficiency η VIN = 12V, VOUT = 5V IOUT = 3A (N2576) 77% Feedback Bias Current IB V OUT = 5V 50nA 100nA Oscillator Frequency FOSC 52 KHz 47 KHz (Min)
58 KHz (Max)
Saturation Voltage V SAT I OUT = 3A (N2576) 1.4V 1.8V Max Current Limit I CL N2576 6.0A 4.0A ~ 7.0A VIH V OUT = 0V 1.4V 2.2V (Min) ON/OFF Pin Logic Input Level VIL V OUT = Nominal Output Voltage 1.2V 1.0V (Max) IIH ON/OFF Pin = 5V (OFF) 12µA 30 µA (Max) ON/OFF Pin Logic Input Current IIL ON/OFF Pin = 0V (ON) 0µA 10 µA (Max) DEVICE SELECTION GUIDE Device N2576S N2576S-3.3 N2576S-5 N2576T N2576T-3.3 N2576T-5 Voltage (V) ADJ 3.3 5 ADJ 3.3 5 Current (A) 3 Package TO-263 TO-263 TO-263 TO-220 TO-220 TO-220
Switching Voltage Regulator (SVR) N2576 TO-263, TO220 MAY-31-2001 NIKO-SEM PIN CONFIGURATIONS 5 - On/Off 4 - Feedback 3 - Ground 1 - Vin 2 - Output GroundGround 2 - Output 1 - Vin 3 - Ground 4 - Feedback 5 - On/Off 5 -LEAD TO-220 (T) 5 -LEAD TO-263 (S)
Switching Voltage Regulator (SVR) N2576 TO-263, TO220 MAY-31-2001 NIKO-SEM TO-220 (5-Lead) MECHANICAL DATA mm mm B 2.61 2.74 2.87 I 6.81 C J 4.4 4.6 4.8 G 0.73 0.83 0.93 N 7°
Switching Voltage Regulator (SVR) N2576 TO-263, TO220 MAY-31-2001 NIKO-SEM TO-263 (D2PAK, 5-Lead) MECHANICAL DATA mm mm B 4.2 4.7 I 9.8 10.3 C 1.20 1.35 J 6.5 D 2.8 K 1.5 G 8.5 9 9.5 N