LV8761V-TLM-E ON Semiconductor, LV8761V-TLM-E Datasheet - Page 9

• Manufacturer Part Number: LV8761V-TLM-E
• Description: Motor / Motion / Ignition Controllers & Drivers BRUSH MOTOR IC
• Manufacturer: ON Semiconductor

Specifications of LV8761V-TLM-E

• Motor Type: Half Bridge
• No. Of Outputs: 1
• Driver Case Style: SSOP
• No. Of Pins: 36
• Operating Temperature Range: -20°C To +85°C
• Svhc: No SVHC (20-Jun-2011)
• Base Number: 8761
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Details

Output short-circuit protection function
1.Protection function operation (Latch method)
2.How to set the SCP pin constant (timer latch-up setting)
The LV8761V incorporates an output short-circuit protection circuit that turns off the output to prevent the IC from
fatal damage when the output is short-circuited due to short-to-power or short-to-ground fault. Either the “latch-type,”
in which the output off state is latched when the short-circuit protection circuit is activated, or “auto reset-type,” in
which the output on/off states are repeated when the short-circuit protection circuit is activated, can be selected.
The short-circuit protection circuit is activated when it detects the output short-circuit state. If the short-circuit state
continues for the internally preset period (≈ 4μs), the protection circuit turns off the output from which the short-circuit
state has been detected. Then it turns the output on again after a lapse of the timer latch time described later. If the
short-circuit state is still detected, it changes all the outputs to the standby mode and retains the state. The latched state
is released by setting the PS to L.
The user can set the time at which the outputs are turned off when a short-circuit occurs by connecting a capacitor
across the SCP and GND pins. The value of the capacitor can be determined by the following formula :
When a capacitor with a capacitance of 50pF is connected across the SCP and GND pins, for example, Tscp is
calculated as follows :
Timer latch-up : Tocp
Internal counter
detection state
SCP voltage
Short-circuit
output state
H-bridge
EMM Pin
H
L
Tscp = 50pF × 1V/5μA = 10μs
1st counter
start
Short-
circuit
1st counter
Short-circuit Protection Mode
stop
Release
Auto reset type
Latch type
Output ON
1st counter
Tocp ≈ C × V/I [s]
start
Short-circuit
V : Comparator threshold voltage (1V typical)
I : SCP charge current (5μA typical)
4μs
LV8761V
1st counter
end
Output OFF
Threshold voltage
2nd counter
start
Output ON
2nd counter
Standby state
end
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