HV9957K7-G Supertex, HV9957K7-G Datasheet - Page 13

• Manufacturer Part Number: HV9957K7-G
• Description: LED Lighting Drivers LED DRIVER 6 CHANNEL W/ FAULT PROTECTION
• Manufacturer: Supertex

Specifications of HV9957K7-G

• Product Category: LED Lighting Drivers
• Rohs: yes
• Input Voltage: 5 V
• Maximum Supply Current: 10 mA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-24
• Minimum Operating Temperature: - 40 C
• Factory Pack Quantity: 3000

Fault Protection Logic Table
UV
X
X
X
1
0
0
0
0
OCP
X
X
X
X
1
0
0
0
Supertex inc.
OVP
X
X
X
X
0
1
0
0
S/L
X
X
X
1
X
0
X
0
ACH OTP1 OTP2
X
X
X
X
X
0
1
0
1235 Bordeaux Drive, Sunnyvale, CA 94089
X
X
X
X
X
1
0
1
X
X
0
0
0
0
0
1
CHL &
CHH
CH
X
X
X
X
X
X
X
13
Description
Shuts down the IC when supply voltage is too low.
Turns OFF boost converter switch when instantaneous
current becomes excessive. Operates cycle-by-cycle. The
active channels remain ON, but with a lower V
strings may not be lit.
Shuts down boost converter when output voltage exceeds
threshold set by R
an open string and are disconnected from feedback all at
once. The channels remain on to discharge C
The boost converter is re-enabled when V
lower OVP threshold and the voltage at least one channel
falls below the V
Short/Long string. The S/L signal is used to determine if the
channel to be disabled has a long string or a short string,
with a bias towards a long string.
Identifies the channel with the lowest (CHL) and high-
est (CHH) voltages. In conjunction with S/L, identifies the
channel to be disabled.
All channels High. Indicates when all active channels have
a voltage above the regulated feedback voltage, which oc-
curs when a channel with an open or long string is disabled.
ACH disables the faulty string protection circuit and turns
OFF the boost converter until one channel falls below V
The active channels remain ON when the boost converter
is disabled to assure C
Excessive die temperature triggers the faulty string protec-
tion circuit, disconnecting a string. If die temperature falls
below the hysteresis threshold, OTP1 is re-armed for any
subsequent faulty strings. If die temperature rises, OTP2
triggers.
Critical die temperature immediately shuts down the boost
converter. Self-resets when die temperature falls by the
hysteresis threshold. The boost converter is re-enabled but
faulty strings remain disconnected.
Tel: [phone]
ACH
OVP
threshold
. The channel outputs are checked for
OUT
is discharged.
www.supertex.com
BST
falls below the
OUT
HV9957
.
BST
, some
ACH
.