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參數(shù)資料
| 型號： | L6731D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | HTSSOP-16 |
| 文件頁數(shù)： | 20/23頁 |
| 文件大?。?/td> | 386K |
| 代理商： | L6731D |
Pin connections and functions
L6731D
6/23
3
Pin connections and functions
Figure 2.
Pin connection (top view)
Table 4.
Pin functions
Pin n.
Name
Function
1
PGOOD
This pin is an open collector output and it is pulled low if the output voltage
is not within the specified thresholds (90 %-110 %). If not used it may be left
floating. Pull-up this pin to VCCDR with a 10 K resistor to obtain a logical
signal.
2
VTTREF
This pin is connected to the output of an internal buffer that provides of
DDR-IN. This pin can be connected to the VTTREF input of the DDR
memory itself. Filter to GND with 10 nF capacitor.
3
SGND
All the internal references are referred to this pin.
4
FB
This pin is connected to the error amplifier inverting input. Connect it to
VOUT through the compensation network. This pin is also used to sense the
output voltage in order to manage the over voltage conditions and the
PGood signal.
5
COMP
This pin is connected to the error amplifier output and is used to
compensate the voltage control feedback loop.
6
SS/INH
The soft-start time is programmed connecting an external capacitor from
this pin and GND. The internal current generator forces a current of 10
A
through the capacitor. When the voltage at this pin is lower than 0.5 V the
device is disabled.
7
DDR-IN
By setting the voltage at this pin is possible to select the internal/external
reference and the switching frequency:
VEAREF 0-80 % of VCCDR -> External reference/FSW = 250 kHz
VEAREF = 80 %-95 % of VCCDR -> VREF = 0.6 V/FSW = 500 kHz
VEAREF = 95 %-100 % of VCCDR -> VREF = 0.6 V/FSW = 250 kHz
An internal clamp limits the maximum VEAREF at 2.5 V (typ.). The device
captures the analog value present at this pin at the start-up when VCC
meets the UVLO threshold.
1
2
3
4
5
6
11
12
HTSSOP16
13
14
15
16
SGND
DDR-IN
FB
PGOOD
VTTREF
COMP
VCC
LGATE
PHASE
SS/INH
PGND
7
10
VCCDR
BOOT
HGATE
8
9
OCL
OCH
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