Microchip HV9982DB1 Manual

Microchip Ikke kategoriseret HV9982DB1

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Supertex inc.
Supertex inc.
www.supertex.com
HV9982DB1
Doc.# DSDB-HV9982DB1
A032913
General Description
The HV9982DB1 is a three channel boost LED driver
demoboard using Supertex’s HV9982 LED Driver IC. The
LED driver can be used to drive RGB or multi channel
white LEDs from a 24V input. The LED string current can
be adjusted up to a maximum of 100mA. The demoboard
has good current matching between strings and an excellent
PWM dimming response, making it ideal for LED backlight
applications.
The HV9982DB1 uses the HV9982 LED driver IC to drive
three discontinuous conduction mode boost converters
at a 500kHz switching frequency. The clocks of the three
channels are phase shifted to provide ripple cancellation at
the input and thus reducing the input capacitor requirements.
The output current level can be adjusted using an external
voltage source at the REF terminal.
The HV9982DB1 includes hiccup mode protection for both
short circuit and open circuit conditions to ensure that it
recovers from a momentary fault condition. It also enables
the board to survive prolonged fault conditions without any
damage to both the driver as well as the LEDs.
The HV9982DB1 also includes an on-board PWM generator
for analog control for PWM dimming (for backward
compatibility with CCFL controllers). This feature enables
the user to PWM dim the driver with a 0 - 2.0V analog signal
input and helps to achieve zero LED current with an analog
dimming input
Connection Diagram
Three Channel
LED Driver Demoboard
Specications
Parameter Value
Input voltage 24V ± 10%
LED string voltage (all channels) 35V – 80V
LED current (all channels) 100mA (max)
Switching frequency of the
converter at FCLK = 6.0MHz 500kHz
External frequency at CLK pin 6MHz
Current matching between
channels ≤ ± 3%
Typical full load efciency 90%
PWM dimming
rise and fall times ≤1μs
PWM dimming frequency
(for analog control of PWM
dimming)
480Hz (typ)
Shutdown mode current ≤ 600μA
Typical IDD current
(for all three channels) 12mA (VDD = 8V)
Open LED drotection Included; hiccup-mode
Output short circuit protection Included; hiccup-mode
Hiccup time 1ms (typ)
24V DC source
0 - 0.5V
DC source
6MHz clock
(TTL compatible)
- +
+
-

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: HV9982DB1

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