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IC-Hersteller ISSI

ISSI IS32LT3952-GRLA3-EB | Demoboard IS31LT3952_IS32LT3952 DEMO BOARD

CONSTANT-CURRENT 1.5-AMPERE PWM DIMMABLE BUCK REGULATOR LED DRIVER WITH FAULT PROTECTION

Details

TopologieAbwärtswandler
Eingangsspannung4.5-38 V
Schaltfrequenz1-2000 kHz
Ausgang 11.5 A
IC-RevisionA

Beschreibung

The IS31LT3952_IS32LT3952 is a DC-to-DC switchingconverter, which integrate an N-channel MOSFET tooperate in a buck configuration. The device supply awide input voltage between 4.5V and 38V andprovides a constant current of up to 1.5A for driving asingle LED or multiple series connected LEDs.The external resistor, RSET, is used to adjust LEDoutput current, which allowing the output voltage to beautomatically adjusted for a variety of LEDconfigurations.The IS31LT3952_IS32LT3952 operates in a fixedfrequency mode during switching. There is an externalresistor connected between the VCC and TON pinsused to configure the on-time (switching frequency).The switching frequency is dithered for spreadspectrum feature to spread the electromagneticemitting energy into a wider frequency band. It ishelpful to optimize the EMI performance.A logic input PWM signal to the enable (EN) pin isapplied to adjust the LED current. The brightness ofLED is proportional to the duty cycle of the PWMsignal.True average output current operation is achieved withfast transient response by using cycle-by-cycle,controlled on-time method.IS31LT3952_IS32LT3952 is available in an SOP-8-EPpackage with an exposed pad for enhanced thermaldissipation. It operates from 4.5V to 38V over thetemperature range of -40°C to +125°C.

Eigenschaften

  • Wide input voltage supply from 4.5V to 38V
    • Withstand 40V load dump
  • ±5% true average output current control
  • 1.5A maximum output over operating temperature range
  • Cycle-by-cycle current limit
  • Integrated high-side MOSFET switch
  • Dimming via direct logic input or power supply voltage
  • Internal control loop compensation
  • Under-voltage lockout (UVLO) and thermal shutdown protection
  • 2μA low power shutdown
  • Spread spectrum to optimize EMI
  • Robust fault protection:
  • Pin-to-GND short
  • Component open/short faults
  • Adjacent pin-to-pin short
  • LED open/short
  • AEC-Q100 qualification IS32LT3952 only

Typische Anwendungen

  • Dimmable interior lights
  • Automotive and avionic lighting / Daytime running lights / Turn/stop lights / Front and rear fog lights / Map light

Weiterführende Informationen

Artikeldaten

Artikel Nr. Daten­blatt Simu­lation Downloads ProduktserieL
(µH)
IR
(A)
ISAT
(A)
RDC
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
BauformVersion Muster
74477110SPEC
8 Dateien WE-PD SMT-Speicherdrossel 10 5 5.5 18 25 21.5 1260 Standard
7447709100SPEC
8 Dateien WE-PD SMT-Speicherdrossel 10 7.1 10.5 13 21 21 1210 Standard
744771115SPEC
8 Dateien WE-PD SMT-Speicherdrossel 15 3.75 4.55 25 30 16.6 1260 Standard
7447709150SPEC
8 Dateien WE-PD SMT-Speicherdrossel 15 6.5 8 21 26 17 1210 Standard
744771122SPEC
8 Dateien WE-PD SMT-Speicherdrossel 22 3.37 3.77 31 36 13.5 1260 Standard
7447709220SPEC
8 Dateien WE-PD SMT-Speicherdrossel 22 5.3 6.5 23 28 10 1210 Standard
744771133SPEC
8 Dateien WE-PD SMT-Speicherdrossel 33 2.68 3 49 57 11 1260 Standard
7447709330SPEC
8 Dateien WE-PD SMT-Speicherdrossel 33 4.2 5.5 37 45 8.5 1210 Standard
7447709470SPEC
8 Dateien WE-PD SMT-Speicherdrossel 47 3.8 4.5 46 60 6.5 1210 Standard
744771147SPEC
8 Dateien WE-PD SMT-Speicherdrossel 47 2.21 2.6 72 75 9.2 1260 Standard
Muster
Artikel Nr. Daten­blatt Simu­lation Downloads ProduktserieL
(µH)
IR
(A)
ISAT
(A)
RDC
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
BauformVersion Muster