Microchip HV9861A Handleiding

Microchip Niet gecategoriseerd HV9861A

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2014-2022 Microchip Technology Inc. and its subsidiaries DS20005333B-page 1
Features
• Fast Average Current Control
• Programmable Constant Off-Time Switching
• PWM/Linear Dimming Input
• Output Short Circuit Protection with Skip Mode
• Ambient Operating Temperature -40°C to +125°C
• Pin-Compatible with the HV9910B and HV9961
Applications
• DC/DC or AC/DC LED Driver Applications
• LED Back-Light Driver for LCD Displays
• General Purpose Constant Current Source
• LED Signage and Displays
• Architectural and Decorative LED Lighting
• LED Street Lighting
Description
HV9861A is a patented, average-mode, constant-
current control, LED driver IC operating in a constant
off-time mode. Unlike the HV9910B, this control IC
does not produce a peak-to-average error, which
therefore greatly improves the accuracy, line and load
regulation of the LED current without any need for loop
compensation or high-side current sensing. The output
LED current accuracy is ±3%.
The IC is equipped with a current limit comparator for
hiccup-mode output short circuit protection. Internal
over-temperature protection is provided. The internally
regulated voltage (VDD) for the HV9861A is 7.5V.
The IC can be powered from a 15 - 450V supply. A
PWM dimming input is provided that accepts an
external control TTL-compatible signal. The output
current can be programmed by an internal 270 mV
reference, or controlled externally through a 0 - 1.5V
dimming input.
HV9861A is pin-to-pin compatible with the HV9910B
and HV9961, and can be used as a drop-in
replacement for many applications to improve the LED
current accuracy and regulation.
Package Types
8-Lead SOIC 16-Lead SOIC
VIN
CS
GND
GATE
RT
LD
VDD
PWMD
VIN
NC
NC
CS
GND
NC
NC
GATE
NC
NC
RT
LD
VDD
NC
NC
PWMD
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
8
7
6
5
See Table 2-1 for pin information
HV9861A
LED Driver with Average-Mode Constant Current Control
2014-2022 Microchip Technology Inc. and its subsidiaries DS20005333B-page 2
HV9861A
Typical Application Circuit
Functional Block Diagram
PWMD
VDD
LD
GATE
CS
RT
VIN
HV9861A
15VDC to
450VDC
Sets
LED
Current
LED
Load
GND
RCS
RT
R Q
S Q
TOFF
Timer
Latch
Enable
Blanking
0.45V
min (VLD
•
0.18, 0.27V)
650µs
Current
Mirror
i
Regulator
VIN
LD
CS
GND
VDD
GATE
PWMD
RT
UVLO
POR
0.15/0.20V
Average Current
Control Logic
OUT
Auto-REF
HV9861A
CLK
IN
+
-
+
-
+
-
11µA
2014-2022 Microchip Technology Inc. and its subsidiaries DS20005333B-page 3
HV9861A
1.0 ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
VIN to GND............................................................................................................................................... –0.5V to +470V
VDD to GND.................................................................................................................................................................12V
LD, PWMD, GATE to GND.......................................................................................................... ....–0.3V to (V
DD + 0.3V)
CS, RT to GND ....................................................................................................................................... ....–0.3V to 5.0V
Operating temperature........................................................................................................................... –40°C to +125°C
Storage temperature .............................................................................................................................. –65°C to +150°C
Continuous power dissipation (TA = +25°C)
8-lead SOIC...........................................................................................................................................650 mW
16-lead SOIC.......................................................................................................................................1000 mW
1.1 ELECTRICAL SPECIFICATIONS
Note: Stresses above those listed under “Absolute 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 operatio is not implied. Exposure to maximumnal listings of this specification,
rating conditions for extended periods may affect device reliability.
TABLE 1-1: ELECTRICAL CHARACTERISTICS (Note 1)
Parameter Symbol Min Typ Max Units Conditions
Input
Input DC Supply Voltage
Range (Note 2)VINDC 15 — 450 V DC Input Voltage (Note 3)
Shut-down Mode Supply
Current IINSD — 0.5 1.1 mA Pin PWMD to GND (Note 3)
Internal Regulator
Internally Regulated Voltage VDD 7.25 7.50 8.20 V 500 pF at GATE; R
T = 226 kΩ
Line Regulation of VDD ΔVDD, line — — 1 V VIN = 15 - 450V,
500 pF at GATE; RT = 226 kΩ
Load Regulation of VDD ΔVDD, load — — 100 mV IDD(ext) = 0 - 1 mA,
500 pF at GATE; RT = 226 kΩ
VDD Under-voltage Lockout
Threshold UVLO 6.45 — — V VIN rising (Note 3)
VDD Under-voltage Lockout
Hysteresis ∆UVLO — 500 — mV V
IN falling
VDD Voltage Margin ∆VDD(UV) 500 — — mV ∆VDD(UV) = VDD - UVLO (Note 3)
Maximum Input Current
(limited by UVLO) IIN,MAX
3.5 — — mA VIN = 15V, TA
= 25°C (Note 4)
1.5 — — VIN = 15V, TA
= 125°C (Note 4)
PWM Dimming
PWMD Input Low Voltage VEN(lo) — — 0.8 V VIN = 15 - 450V (Note 3)
PWMD Input High Voltage VEN(hi) 2.2 — — V VIN = 15 - 450V (Note 3)
Internal Pull-down Current
at PWMD IEN 8 — 15 μA VPWMD = 0.8V

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV9861A

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