A8501KLPTR-B データシートの表示（PDF） - Allegro MicroSystems
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A8501KLPTR-B Datasheet PDF : 24 Pages
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A8501
2 MHz, 4 Channel×100 mA WLED/RGB Driver
with Output Disconnect
Performance Characteristics
Startup Waveforms
Soft Start Turn On Using Rising VBAT
VBAT = 12 V, IOUT = 400 mA
4 channels enabled, 6 series LEDs each
A BC
DE
F
VBAT
C1
IBAT
C2
VOUT
C3
IOUT
C4
Symbol
C1
C2
C3
C4
t
Parameter
VBAT
IBAT
VOUT
IOUT
time
Units/Division
10 V
500 mA
20 V
500 mA
5 ms
A BC
DE
F
t
A. VBAT voltage slowly increased with EN held high.
A–B. Input bulk capacitor CBAT and boost output capacitor COUT are charged to
VUVLO .
B. VBAT reaches VUVLO, and enables A8501 through soft start.
B–C. During soft start period, boost switch peak current is limited to 600 mA and
LED current to 1/20 of desired level. Narrow current spike at B is due to
parasitic capacitance from OUT to ground and CBIAS. COMP pin is help low
during soft start.
D. After VOUT reaches a level such that all LED pins > 0.75 V, the A8501
comes out of soft start.
C–E. After initial rise of VOUT , the capacitor CCOMP starts charging slowly (CCOMP
not shown).
E. VCOMP reaches desired level for stable operation.
F. A8501 and LEDs reach thermal steady state.
Turn On Using EN Pin
VBAT = 8 V, IOUT = 400 mA
4 channels enabled, 6 series LEDs each
VEN
C1
VOUT
C2
IOUT
C3
Symbol
C1
C2
C3
C4
t
Parameter
VBAT
VOUT
IOUT
IBAT
time
Units/Division
5V
20 V
500 mA
500 mA
2 ms
IBAT
C4
t
Allegro MicroSystems, Inc.
9
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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