Microchip HV9919B Handleiding

Microchip Niet gecategoriseerd HV9919B

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2015 Microchip Technology Inc. 20005462B-page 1
Features
• Hysteretic control with high-side current sensing
• Wide input-voltage range: 4.5 to 40V
• >90% Efficiency
• Typical ±5% LED current accuracy
• Up to 2.0MHz switching frequency
• Adjustable constant LED current
• Analog or PWM control signal for PWM dimming
• Over-temperature protection
• -40ºC to +125ºC operating temperature range
Applications
• Low-voltage industrial and architectural lighting
• General purpose constant current source
• Signage and decorative LED lighting
• Indicator and emergency lighting
Description
HV9919B is a Pulse-Width Modulation (PWM) control-
ler IC designed to drive high-brightness LEDs using a
buck topology. It operates from an input voltage of 4.5
to 40VDC and employs hysteretic control, with a high-
side current sense resistor, to set the constant output
current.
Set the operating frequency range by selecting the
proper inductor. Operation at high switching frequency
is possible since the hysteretic control maintains accu-
racy even at high frequencies. This permits the use of
small inductors and capacitors, minimizing space and
cost in the overall system.
LED brightness control is achieved with PWM dimming
from an analog or PWM input signal. Unique PWM cir-
cuitry allows true constant color with a high dimming
range. The dimming frequency is programmed using a
single external capacitor.
HV9919B comes in a small, 8-Lead DFN package and
is ideal for industrial and general lighting applications.
Package Type
See Table 2-1 for pin information
8-Lead DFN
8
7
6
5
1
2
3
4
CS
VIN
RAMP
ADIM
GATE
GND
VDD
DIM
GND
HV9919B
Hysteretic, Buck, High Brightness LED Driver
with High-Side Current Sensing
HV9919B
20005462B-page 2 2015 Microchip Technology Inc.
Block Diagram
Typical Application Circuit
CURRENT
SENSE
COMPARATOR
UVLO
COMPARATOR
GATE
DRIVER
VIN VDD
CS
RAMP
ADIM
GND
DIM
GATE
HV9919B
PWM RAMP
0.1~1.9V -
+
+
-
BANDGAP
REF
+
-
REGULATOR
CIN
0 - 2.0V
HV9919B
VIN
VDD
GATE
GND
CS
RAMP
ADIM
DIM
RSENSE L
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 +V
DD
CS to VIN...................................................................................................................................................-1.0V to +0.3V
Continuous total power dissipation (T
A = 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
V
DD
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 t
DPDL - 70 - ns Rising edge of
(VIN- VCS) = VRS(HI)+ 70mV
Current-sense input current I
CS - - 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

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV9919B

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