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HV9989 Datasheet(PDF) 13 Page - Microchip Technology

No. de pieza HV9989
Descripción Electrónicos  Three-Channel CCM/DCM Boost LED Driver with Sub-Microsecond PWM Dimming
PDF  22 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HV9989 Datasheet(HTML) 13 Page - Microchip Technology

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 2014 Microchip Technology Inc.
DS20005296B-page 13
HV9989
3.13
Input-Output Voltage Comparator
The HV9989 includes a circuit for detecting any of the
three boost converter output voltages falling below the
input voltage. The input voltage is monitored at the
VIN_SNS input using a resistor divider having the
same ratio as the OVP1-3 resistor dividers. An open-
drain FLG output reports a high impedance state when
the voltage at either of the OVP1-3 inputs falls below
VIN_SNS. The FLG output recovers into the low-
impedance state when the faulty OVP input voltage
becomes greater than VIN_SNS by a 55mV hysteresis.
A pull-up resistor should be added at FLG. The FLG
output can sink up to 1.0mA.
FIGURE 3-5:
TIMER CIRCUIT
S
R
Q
Fault
+
-
+
-
Fault
FCA
DIS
SKIP
POR
SCDA
SCDB
SCDC
0.1V
5.0V
10µA



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