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HV9919B Datasheet(PDF) 3 Page - Microchip Technology

Part # HV9919B
Description  Hysteretic, Buck, High Brightness LED Driver with High-Side Current Sensing
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HV9919B Datasheet(HTML) 3 Page - Microchip Technology

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 2015 Microchip Technology Inc.
20005462B-page 3
HV9919B
1.0
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
VIN to GND .................................................................................................................................................-0.3V to +45V
VDD to GND...............................................................................................................................................-0.3V to +6.0V
GATE, RAMP, DIM, ADIM to GND .............................................................................................................-0.3V to +VDD
CS to VIN...................................................................................................................................................-1.0V to +0.3V
Continuous total power dissipation (TA = 25.°C)..................................................................................................... 1.6W
Operating temperature range................................................................................................................ -40°C to +125°C
Junction temperature ...........................................................................................................................................+150°C
Storage temperature range ................................................................................................................... -65°C to +150°C
† Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods
may affect device reliability.
TABLE 1-1:
ELECTRICAL CHARACTERISTICS (SHEET 1 OF 2)
Electrical Specifications: VIN=12V, VDIM = VDD, VRAMP = GND, CVDD = 1.0 µF, RCS = 0.5Ω,
TA= TJ= -40°C to +125°C, unless otherwise noted. (Note 1)
Parameter
Symbol
Min
Typ
Max
Units Conditions
Input DC supply voltage range
VIN
4.5
-
40
V
DC input voltage
Internally regulated voltage
VDD
4.5
-
5.5
V
VIN= 6.0 to 40V
Supply current
IIN
-
-
1.5
mA
GATE open
Shutdown supply current
IIN, SDN
-
-
900
µA
DIM< 0.7V
Current limit
IIN, LIM
-11-
mA
VIN= 4.5V, VDD= 0V
-5.5
-
VIN= 4.5V, VDD= 4.0V
Switching frequency
fSW
--
2.0
MHz
VDD Undervoltage lockout thresh-
old
UVLO
-
-
4.5
V
VDD rising
VDD Undervoltage lockout hysteresis
∆UVLO
-
500
-
mV
VDD falling
Sense Comparator
Sense voltage threshold high
VCS(HI)
-230
-
mV
(VIN- VCS) rising
Sense voltage threshold low
VCS(LO)
-170
-
mV
(VIN- VCS) falling
Average sense voltage
VCS(AVG)
186
200
214
mV
VCS(AVG) = 0.5(VCS(HI) + VCS(LO))
Propagation delay to output high
tDPDH
-70-
ns
Falling edge of
(VIN- VCS) = VRS(LO)- 70mV
Propagation delay to output low
tDPDL
-70-
ns
Rising edge of
(VIN- VCS) = VRS(HI)+ 70mV
Current-sense input current
ICS
--
1.0
µA
(VIN- VCS) = 200mV
Current-sense threshold hysteresis
VCS(HYS)
15
56
98
mV
VCS(HYS) = VCS(HI) - VCS(LO)
DIM Input
Pin DIM input high voltage
VIH
2.2
-
-
V
Pin DIM input low voltage
VIL
--
0.7
V
Turn-on time
tON
-100
-
ns
DIM rising edge to
VGATE= 0.5 x VDD, CGATE= 2.0nF
Turn-off time
tOFF
-100
-
ns
DIM falling edge to
VGATE= 0.5 x VDD, CGATE=2.0nF


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