L6740LTR STMicroelectronics, L6740LTR Datasheet - Page 40

• Manufacturer Part Number: L6740LTR
• Description: IC HYBRID CONTROLLERS 48TQFP
• Manufacturer: STMicroelectronics

Specifications of L6740LTR

• Applications: Hybrid Controllers
• Voltage - Supply: 9 V ~ 15 V
• Current - Supply: 20mA
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
• Number Of Outputs: 2
• Output Current: 170 A
• Input Voltage: 13.2 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-6298-2

LTB Technology™
40/44
●
LTB Technology
Gain design. Through the LTBGAIN pin it is possible to modify the slope of the LTB
Ramp in order to modulate the entity of the LTB response once the LT has been
detected. In fact, the response depends on the board design and its parasites requiring
different actions from the controller.
Leaving the LTBGAIN pin floating, the maximum pulse-width is programmed. The slope
of the LTB ramp will be equal to 1/2 of the OSC ramp slope.
Connecting R
Where I
(20μA plus the current sunk from the OSC pin).
–
–
–
LTBRamp
Decrease R
smaller dV
Increase C
higher dV/dt.
Increase R
ring-back.
LTBGAIN
Slope
TM
LTBGAIN
Design Tips.
OUT
=
LTB
LTBGAIN
is the current sunk from LTBGAIN pin and I
LTB
OSC
.
to increase the system sensitivity making the system sensitive to
to increase the system sensitivity making the system sensitive to
to GND, the LTB Ramp slope can be modified as follow:
Slope
to increase the width of the LTB pulse reducing the system
⋅
⎛
⎝
1
+
I
----------------------- -
LTBGAIN
I
OSC
⎞
⎠
OSC
is the OSC current
L6740L