HV9982DB1 Supertex, HV9982DB1 Datasheet - Page 2

• Manufacturer Part Number: HV9982DB1
• Manufacturer: Supertex

Specifications of HV9982DB1

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Connections
Table 1 : Truth Table for S1 and S2
GND, GND1
PWMD1-3
VO- 1-3
VO+1-3
S1, S2
SYNC
SKIP
VDD
CLK
REF
VIN
Pin
LO
LO
S1
EN
5V
HI
HI
Connection
This terminal is the positive input of the 24V supply for the boost converters. It is also the input for the
internal regulator of the IC.
These terminals are the return paths for all the input voltages and signals for the demoboard. All voltages
and signals (other than the output terminals) should be referenced to these two terminals.
This terminal is connected to the VDD pins of the IC. When left unconnected, the voltage at this terminal
will be regulated to 7.75V by the internal regulator of the HV9982. To supply the IC with an external VDD
supply, connect an 8-10V source to this terminal.
This terminal can be used to shut down the IC. Connecting this terminal to GND will cause the IC to go
into a standby mode and draw less than 500μA.
This terminal is the clock input to the IC. A TTL compatible 6MHz clock should be connected to this ter-
minal. In case an on-board clock is preferred, a 6MHz fi xed frequency oscillator can be soldered in at U2
(please refer to BOM for the part number).
A 5.0V, 50mA source needs to be connected to this point, if an on-board clock is used. This provides
the power required for the fi xed frequency oscillator at U2. This terminal can be left open if an external
6.0MHz clock is used.
This terminal is the control input for adjusting the LED current level. A 0 – 500mV voltage source should
be connected to this terminal.
These two switches on the demoboard control the PWM dimming function. They can be used to enable
either direct PWM dimming of the channels using an external TTL signal or analog control of PWM dim-
ming using a 0-2.0V analog signal. The control logic for these switches is given in Table 1.
These terminals are the PWM dimming inputs. The inputs can be either TTL compatible square wave
signals or 0-2.0V analog signals depending on the confi guration of switches S1 and S2.
The anodes of the LED strings should be connected to these terminals as shown in the connection dia-
gram.
The cathodes of the LED strings should be connected to these terminals as shown in the connection
diagram.
This terminal is connected to the hiccup timing capacitor and can be used to measure the hiccup time.
This terminal can be used to synchronize the internal PWM ramp to an external clock. A TTL compatible,
350Hz – 400Hz external clock with a pulse width less than 2% can be applied at this terminal to synchro-
nize the internal ramp to the external clock.
LO
LO
S2
HI
HI
PWMD Output
The output will follow PWMD input signal
Input DC zero volt corresponds to 100% duty cycle output
Input DC two volt corresponds to 100% duty cycle output
2
HV9982DB1