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SM8122AH Scheda tecnica(PDF) 5 Page - Nippon Precision Circuits Inc

Il numero della parte SM8122AH
Spiegazioni elettronici  White LED Driver IC
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Produttore elettronici  NPC [Nippon Precision Circuits Inc]
Homepage  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8122AH Scheda tecnica(HTML) 5 Page - Nippon Precision Circuits Inc

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SM8122A
NIPPON PRECISION CIRCUITS INC.—5
OPERATION OVERVIEW
The SM8122A basic structure is a step-up DC/DC converter. The booster control employs Pulse Width Modu-
lation (PWM) which controls the pulse duty cycle (85% max.) at constant frequency (2.0MHz typ.). The LED
current is set by a current-setting resistor R1 connected between pins FB (with stable voltage of 0.5V typ.) and
VSS.
When the switching transistor SW-Tr is ON, energy is stored in the inductor L. When SW-Tr is rapidly
switched OFF, the energy stored in the inductor generates a voltage across the terminals of the inductor. The
induced voltage, after being added to the input voltage, turns ON the Schottky barrier diode SBD and the
stored energy is transferred to the output capacitor. This sequence of events continues repeatedly, boosting the
output voltage.
The SM8122A features a built-in soft-start function. The soft-start time is approximately 500
µs from after the
chip enable input CE rising edge. During this interval, the maximum duty is restricted.
R1
SBD
L
4.7
µH
CIN
4.7
µF
VIN
2.3 to 5.5V
COUT
1.0
µF
Enable
Disable
LED
CE
SW
VSS
VDD
FB
Buff
SOFT
START
OSC
PWM
COMP
RAMP
GENERATOR
VOUT
OVP
COMP
VREF
ERR
AMP


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