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LM3000 датащи(PDF) 4 Page - Texas Instruments

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номер детали LM3000
подробное описание детали  Dual Synchronous Emulated Current-Mode Controller
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM3000 датащи(HTML) 4 Page - Texas Instruments

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LM3000
SNVS612B – JULY 2009 – REVISED APRIL 2013
www.ti.com
PIN DESCRIPTIONS
Pin No.
Name
Description
1
VSW2
Switch node sense for channel 2.
2
PGND2
Power ground for channel 2 low-side drivers.(1)
3
LG2
Channel 2 low-side gate drive for external MOSFET.
4
VIN
Chip supply voltage, input to the VDD and VDR regulators. (3.3V to 18.5V)
5
VDR
Supply for low-side gate drivers.
6
LG1
Channel 1 low-side gate drive for external MOSFET.
7
PGND1
Power ground for channel 1 low-side drivers.(1)
8
VSW1
Switch node sense for channel 1.
9
ILIM1
Current limit setting input for channel 1.
10
HG1
Channel 1 high-side gate drive for external MOSFET.
11
VCB1
Boost voltage for channel 1 high-side driver.
12
VDD
Supply for control circuitry.
13
EA1_GND
Error amplifier ground sense for channel 1.(1)
14
FB1
Error amplifier input for channel 1.
15
COMP1
Error amplifier output for channel 1.
16
PGOOD1
Power good signal for channel 1 under-voltage and over-voltage.
17
FREQ/SYNC
Frequency set / synchronization input for internal PLL.
18
EN1
Channel 1 enable input. Used to set the emulated current slope for channel 1.
19
TRK1
Channel 1 track input.
20
SS1
Channel 1 soft-start.
21
TRK2
Channel 2 track input.
22
SS2
Channel 2 soft-start.
23
EN2
Channel 2 enable input. Used to set the emulated current slope for channel 2.
24
PGOOD2
Power good signal for channel 2 under-voltage and over-voltage.
25
COMP2
Error amplifier output for channel 2.
26
FB2
Error amplifier input for channel 2.
27
EA2_GND
Error amplifier ground sense for channel 2.(1)
28
CLKOUT
Output clock. CLKOUT is shifted 90 degrees from SYNC input.
29
SGND
Local signal ground.*
30
VCB2
Boost voltage for channel 2 high-side driver.
31
HG2
Channel 2 high-side gate drive for external MOSFET.
32
ILIM2
Current limit setting input for channel 2.
DAP
Exposed die attach pad. Connect the DAP directly to SGND.(1)
(1)
The LM3000 offers true remote ground sensing to achieve very tight line and load regulation. For best layout practice, the EA1_GND,
and EA2_GND should be tied to the ground end of the output capacitor (or output terminal) for VOUT1 and VOUT2 respectively. Inside the
LM3000, the two power ground nodes PGND1 and PGND2 are physically isolated from each other and also isolated from the internal
signal ground SGND. In order to achieve the best cross-channel noise rejection, it is advised to keep these three grounds isolated from
each other for the most part in the board layout and only tie them together at the ground terminals.
4
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