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TERMINAL FUNCTIONS (DCA)
NAME
NO.
I/O
DESCRIPTION
RLIM3
1
I
Current limit setting for Buck 3. Fit a resistor from this pin to ground to set
the peak current limit on the output inductor.
SS3
2
I
Soft start pin for Buck 3. Fit a small ceramic capacitor to this pin to set the
converter soft start time.
COMP3
3
O
Compensation for Buck 3. Fit a series RC circuit to this pin to complete
the compensation circuit of this converter.
FB3
4
I
Feedback input for Buck 3. Connect a divider set to 0.8V from the output
of the converter to ground.
SYNC
5
I
Synchronous clock input. If there is a sync clock in the system, connect to
the pin. When not used connect to GND.
ROSC
6
I
Oscillator set. This resistor sets the frequency of internal autonomous
clock. If external synchronization is used resistor should be fitted and set
to ~70% of external clock frequency.
FB1
7
I
Feedback pin for Buck 1. Connect a divider set to 0.8 V from the output of
the converter to ground.
COMP1
8
O
Compensation pin for Buck 1. Fit a series RC circuit to this pin to
complete the compensation circuit of this converter.
SS1
9
I
Soft start pin for Buck 1. Fit a small ceramic capacitor to this pin to set the
converter soft start time.
RLIM1
10
I
Current limit setting pin for Buck 1. Fit a resistor from this pin to ground to
set the peak current limit on the output inductor.
EN1
11
I
Enable pin for Buck 1. A low level signal on this pin disables it. If pin is
left open a weak internal pull-up to V3V will allow for automatic enable.
For a delayed start-up add a small ceramic capacitor from this pin to
ground.
BST1
12
I
Bootstrap capacitor for Buck 1. Fit a 47-nF ceramic capacitor from this pin
to the switching node.
VIN1
13
I
Input supply for Buck 1. Fit a 10-μF ceramic capacitor close to this pin.
LX1
14, 15
O
Switching node for Buck 1
LX2
16, 17
O
Switching node for Buck 2
VIN2
18
I
Input supply for Buck 2. Fit a 10-μF ceramic capacitor close to this pin.
BST2
19
I
Bootstrap capacitor for Buck 2. Fit a 47-nF ceramic capacitor from this pin
to the switching node.
EN2
20
I
Enable pin for Buck 2. A low level signal on this pin disables it. If pin is
left open a weak internal pull-up to V3V will allow for automatic enable.
For a delayed start-up add a small ceramic capacitor from this pin to
ground.
RLIM2
21
I
Current limit setting for Buck 2. Fit a resistor from this pin to ground to set
the peak current limit on the output inductor.
SS2
22
I
Soft start pin for Buck 2. Fit a small ceramic capacitor to this pin to set the
converter soft start time.
COMP2
23
O
Compensation pin for Buck 2. Fit a series RC circuit to this pin to
complete the compensation circuit of this converter
FB2
24
I
Feedback input for Buck 2. Connect a divider set to 0.8 V from the output
of the converter to ground.
LOW_P
25
I
Low power operation mode(active high) input for TPS65251
GND
26
Ground pin
PGOOD
27
O
Power good. Open drain output asserted after all converters are
sequenced and within regulation. Polarity is factory selectable (active high
default).
V7V
28
O
Internal supply. Connect a 10-μF ceramic capacitor from this pin to
ground.
V3V
29
O
Internal supply. Connect a 10-μF ceramic capacitor from this pin to
ground.
AGND
30
Analog ground. Connect all GND pins and the power pad together.
GND
31
Ground pin
2-25
Содержание T 748
Страница 1: ...L A U N A M E C I V R E S AV Surround Sound Receiver T748 AV Surround Sound Receiver T748 ...
Страница 6: ...DISASSEMBLY REMOVAL OF FRONT PANEL 1 6 ...
Страница 7: ...PRINCIPAL PART LOCATION 1 7 ...
Страница 18: ...IC 211 MX29LV32DTTI 70G FLASH OF DSP 2 6 ...
Страница 19: ...2 7 ...
Страница 29: ...2 17 BLOCK DIAGRAM ...
Страница 40: ...IC 913 IC 918 TC74VCX541FT OCTAL BUS BUFFER 2 28 ...
Страница 44: ...BLOCK DIAGRAM MCU DSP PART 2 32 2 33 ...
Страница 45: ...BLOCK DIAGRAM AUDIO PART 2 34 2 35 ...
Страница 46: ...BLOCK DIAGRAM HDMI PART 2 36 2 37 ...
Страница 62: ...2 68 2 69 PRINTED CIRCUIT BOARD FRONT TOP VIEW ...
Страница 63: ...2 70 2 71 FRONT BOTTOM VIEW ...
Страница 64: ...2 72 2 73 INPUT TOP VIEW ...
Страница 65: ...2 74 2 75 INPUT BOTTOM VIEW ...
Страница 66: ...2 76 2 77 MAIN TOP VIEW ...
Страница 67: ...2 78 2 79 MAIN BOTTOM VIEW ...
Страница 68: ...2 80 2 81 SUB TOP VIEW ...
Страница 69: ...2 82 2 83 SUB BOTTOM VIEW ...
Страница 70: ...2 85 HDMI BOTTOM VIEW 2 84 HDMI TOP VIEW ...