HV9982DB1 Supertex, HV9982DB1 Datasheet - Page 6

• Manufacturer Part Number: HV9982DB1
• Manufacturer: Supertex

Specifications of HV9982DB1

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Short Circuit Protection – Figs. 7-9 show the operation of the short circuit protection. Fig. 7 shows the response of the
HV9982 to a short circuit condition. The short circuit condition occurs when the output current starts rising and the circuit
shuts down in less than 200ns, providing a very fast response to an output short circuit (Note: LED string voltage refers to
VO+ voltage measured w.r.t its corresponding VO-).
The hiccup mode operation is shown in Fig. 8. The converter tries to restart every 1ms and if the short circuit condition is
still detected, the converter shuts down.
The recovery from the short circuit condition is shown in Fig. 9. The LED current starts up without any overshoots.
Fig. 7: Waveforms for Normal Operations
Fig. 8: Short Circuit Hiccup
Fig. 9: Short Circuit Recovery
C1 (Yellow): Output Voltage of Channel 1(20V/div)
C4 (Green):
Time Scale: 1ms/div
C1 (Yellow): Output Voltage of Channel 1(20V/div)
C4 (Green):
Time Scale: 500μs/div
C4 (Green): Output Current for Channel 1 (200mA/div)
Ma (Orange): LED String Voltage of Channel 1(20V/div)
Time Scale: 200ns/div
Output Current for Channel 1 (200mA/div)
Output Current for Channel 1 (200mA/div)
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HV9982DB1