Microchip HV9967B Bruksanvisning
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HV9967B
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2020 Microchip Technology Inc. DS20005734A-page 1
HV9967B
Features
• 3% Accurate LED Current
• 60V, 0.8Ω Integrated MOSFET
• Low Sensitivity to External Component Variation
• Single-Resistor LED Current Setting
• Fixed Off-Time Control
• PWM Dimming Input
• Output Short-Circuit Protection with Skip Mode
• Overtemperature Protection
Applications
• DC/DC or AC/DC LED Drivers
• RGB Backlighting Drivers for Flat Panel Displays
• General Purpose Constant-Current Source
• Signage and Decorative LED Lighting
• Chargers
General Description
The HV9967B is an Average-mode current control LED
driver IC operating in a Constant Off-time mode.
The IC features an integrated 60V, 0.8Ω MOSFET that
can be used as a stand-alone buck converter switch or
connected as a source driver for driving an external
high-voltage Depletion-mode MOSFET. The HV9967B
is powered through its switching output when the
integrated switch is off. Therefore, the same external
MOSFET can be used as a high-voltage linear
regulator for powering the IC.
The LED current is programmed with one external
resistor. The Average-mode current control method
does not produce a peak-to-average error. This greatly
improves the current accuracy as well as the line and
load regulations of the LED current without any need
for loop compensation or direct sensing of the LED
current at a high-voltage potential. The auto-zero circuit
cancels the effects of the input offset voltage and of the
propagation delay of the current sense comparator.
Package Types
8-lead MSOP
(Top view)
8-lead DFN
(Top view)
GND
SW
RSENSE
PGND
PWMD
VDD
AGND
RT
NC
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
SW
RSENSE
PGND
PWMD
VDD
AGND
RT
NC
See Table 2-1 for pin information.
Integrated LED Driver with Average-Mode Current Control
HV9967B
DS20005734A-page 2 2020 Microchip Technology Inc.
Functional Block Diagram
R
S
Q
Q
T
OFF
Timer
SW
0.8ms
RT
VDD
POR
SET
V
CS
REG
UVLO
OTP
4.35V
100kΩ
i
RSENSE
PWMD
PGND
AGND
HV9967B
L/E
Blanking
Average
Current
Control Logic
OUT
IN
0.4V
V
CS
PGND
Short-Circuit
Overcurrent
Comparator
Hiccup Time
2020 Microchip Technology Inc. DS20005734A-page 3
HV9967B
Typical Application Circuit
C
IN
C
DD
D1
L1
LED
String
C
O
HV9967B
U1
R
SENSE
VDD
PGND
PWMD
RSENSE 8
1
3 6
4
R
T
2
RTAGND
7
SW
8 VDC to 60 VDC
+
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | HV9967B |
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