L6740LTR STMicroelectronics, L6740LTR Datasheet - Page 39

• 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

L6740L
10
LTB Technology™
LTB Technology™ further enhances the performances of dual-edge asynchronous systems
by reducing the system latencies and immediately turning ON all the phases to provide the
correct amount of energy to the load. By properly designing the LTB network as well as the
LTB gain, the undershoot and the ring-back can be minimized also optimizing the output
capacitors count. LTB Technology™ applies only to the CORE section.
LTB Technology™ monitors the output voltage through a dedicated pin detecting Load-
Transients with selected dV/dt, it cancels the interleaved phase-shift, turning-on
simultaneously all phases. it then implements a parallel, independent loop that reacts to
load-transients bypassing E/A latencies.
LTB Technology™ control loop is reported in
Figure 18. LTB Technology™ control loop (CORE section)
The LTB detector is able to detect output load transients by coupling the output voltage
through an R
then compared with the COMP pin level. The resulting duty-cycle programmed is then OR-
ed with the PWMx signal of each phase by-passing the main control loop. All the phases will
then be turned-on together and the EA latencies results bypassed as well.
Sensitivity of the load transient detector and the gain of the LTB Ramp can be programmed
in order to control precisely both the undershoot and the ring-back.
●
Z
F
(s)
Detector design. R
which is desired the controller to be sensitive as follow:
R
COMP
LTB
LTB
=
LTB
dV
----------------- -
25μA
OUT
- C
LT Detect
LTB
FB
network. After detecting a load transient, the LTB Ramp is reset and
Ref
LTB
C
PWM
LTB
- C
LTB Ramp
=
LTB
------------------------------------------------- -
2π N R
DROOP
is design according to the output voltage deviation dV
d V
⋅
COMP
Monitor
⋅
1
VSEN
LTB
⋅
Figure
F
SW
PWM_BOOST
18.
Z
FB
LT Detect
(s)
VID
R
LTB
C
L/N
LTB Technology™
LTB
ESR
C
O
V
OUT
39/44
OUT