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TPS5124 Fiches technique(PDF) 5 Page - Texas Instruments

No de pièce TPS5124
Description  DUAL CHANNEL, SYNCHRONOUS STEP-DOWN PWM CONTROLLER
Download  18 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS5124 Fiches technique(HTML) 5 Page - Texas Instruments

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TPS5124
SLUS571 − SEPTEMBER 2003
5
www.ti.com
TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
CT
5
I/O
External capacitor from CT to GND adjusts frequency of the triangle oscillator.
FB1
2
O
Feedback output of SBRC−Channel 1 error amplifier.
FB2
14
O
Feedback output of SBRC−Channel 2 error amplifier.
GND
7
Signal GND.
INV1
1
I
Inverting inputs of Channel 1 error amplifier and OVP1/UVP1 comparator.
INV2
15
I
Inverting inputs of Channel 2 error amplifier and OVP2/UVP2 comparator.
LH1
30
I/O
Bootstrap capacitor connection for Channel 1 high-side gate driver.
LH2
16
I/O
Bootstrap capacitor connection for Channel 2 high-side gate driver.
LL1
28
I/O
CH1 high-side gate driving return. Connect this pin to the junction of the high-side and low-side MOSFETs for
floating drive configuration. This pin is also an input terminal for current comparator.
LL2
18
I/O
CH2 high-side gate driving return. Connect this pin to the junction of the high-side and low-side MOSFETs for
floating drive configuration. This pin is also an input terminal for current comparator.
NC
4,6,12
No connection.
OUT1_D
27
O
Gate drive output for Channel 1 low-side MOSFETs.
OUT2_D
19
O
Gate drive output for Channel 2 low-side MOSFETs.
OUT1_U
29
O
Gate drive output for Channel 1 high-side MOSFETs.
OUT2_U
17
O
Gate drive output for Channel 2 high-side MOSFETs.
OUTGND1
26
Ground for Channel 1 MOSFET drivers.
OUTGND2
20
Ground for Channel 2 MOSFET drivers.
REF
8
O
0.85-V reference voltage output. This 0.85-V reference voltage is used to set the output voltage and the refer-
ence for the overvoltage and undervoltage protections. This reference voltage is dropped down from the inter-
nal 5-V regulator.
SCP
11
I/O
Fault latch timer pin. An external capacitor connected between SCP and GND sets SCP enable time up.
SS1
3
I/O
Soft start control for Channel 1. Connect an external capacitor between this pin and GND to specify SOFT-
START time.
SS2
13
I/O
Soft start control for Channel 2. Connect an external capacitor between this pin and GND to specify SOFT-
START time.
STBY1
9
I
Standby control input for Channel 1. It can be switched into standby mode by grounding the STBY1 pin.
STBY2
10
I
Standby control input for Channel 2. It can be switched into standby mode by grounding the STBY2 pin.
TRIP1
25
I
External resistor connection for Channel 1 output current protection control.
TRIP2
23
I
External resistor connection for Channel 2 output current protection control.
VCC
24
I
Supply voltage input
VLSD
21
I
Supply voltage input for low side driver. Typically connected to VREF5 with R-C filter when VVCC is between
6.5V and 15V and connected to VCC with filter when VVCC is between 4.5 V and 5.5 V.
VREF5
22
O
5V linear regulator output. When VVCC is between 4.5V and 5.5V should be connected to VCC.


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