A80606 and
A80606-1
High Power LED Driver with Pre-Emptive Boost
for Ultra-High Dimming Ratio and Low Output Ripple
ELECTRICAL CHARACTERISTICS [1] (continued): Unless otherwise noted, specifications are valid at VIN = 12 V, TJ = 25°C, • indi-
cates specifications guaranteed over the full operating temperature range with TJ = –40°C to 125°C, typical specifications are at TJ = 25°C
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
OVERVOLTAGE PROTECTION
OVP Pin Voltage Threshold
VOVP(th)
iOVP(th)
OVP pin connected to VOUT
Current into OVP pin at 125°C
Measured over temperature
●
●
2.2
140
140
2.5
146.5
150
2.8
153
160
V
µA
µA
OVP Pin Sense Current Threshold
OVP Sense Current Temperature
Coefficient [2]
∆iOVP
Current into OVP pin
VOUT = 16 V, EN = L
−
−36
−
nA/°C
OVP Pin Leakage Current
IOVPLKG
●
●
−
−
0.1
−
1
4
µA
%
%
V
OVP Variation at Output
ΔOVP
Measured at VOUT when ROVP = 188 kΩ
−
−
7
Measured at VOUT when ROVP = 188 kΩ [2]
Measured at VOUT when ROVP = 0 Ω
2.4
0.13
2.55
0.20
2.7
0.25
Undervoltage Detection Threshold
VUVP(th)
V
BOOST SWITCH GATE DRIVER
Gate Driver Supply Voltage
Gate Driver Pull-Up and Pull-Down
Gate Pull-Down When Disabled
Peak Sink Current [2]
VDRV
Measured at VIN > 7.5 V
−
−
−
−
−
6.5
2.5
100
2
−
−
−
−
−
V
Ω
RGDRV
Measured at iGDRV = 100 mA
RGDRV_OFF EN = L, VIN = 0 V
kΩ
A
iSINK
Measured at VGDRV = VDRV
Peak Source Current [2]
iSOURCE
Measured at VGDRV = 0 V
2
A
Measured with CLOAD = 1.5 nF;
VGDRV between 10% and 90% of VDRV
Gate Rise / Fall Time [2]
tRISE, tFALL
−
7
−
ns
Minimum Gate Driver On-Time
Minimum Gate Driver Off-Time
BOOST SWITCH CURRENT SENSE
tSW(ON)
●
●
−
−
−
−
100
100
ns
ns
tSW(OFF)
Exceeding iCS(LIM1) causes gate driver to
truncate existing cycle, but does not shut down
Primary Current Sense Limit
iCS(LIM1)
iCS(LIM2)
tCSDELAY
●
175
−
210
300
32
245
−
mV
mV
ns
Exceeding iCS(LIM2) causes gate driver to shut
down and latch off
Secondary Current Sense Limit [2]
Secondary Current Sense Limit
Propagation Delay
Overdrive CS threshold by 10%, excluding
leading edge blanking
−
−
OSCILLATOR FREQUENCY
RFSET = 10 kΩ
RFSET = 110 kΩ
RFSET = 10 kΩ
●
1.95
−
2.15
200
2.35
−
MHz
kHz
V
Oscillator Frequency
fSW
FSET Pin Voltage
VFSET
−
1.00
−
SYNCHRONIZATION
VSYNCL
VSYNCH
FSET/SYNC pin logic Low
FSET/SYNC pin logic High
●
●
●
●
●
−
−
−
−
−
−
0.4
−
V
V
Sync Input Logic Level
1.5
260
150
150
Synchronized PWM Frequency
Synchronization Input Min Off-Time
Synchronization Input Min On-Time
fSWSYNC
2300
−
kHz
ns
ns
tPWSYNCOFF
tPWSYNCON
−
Continued on the next page…
7
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
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