參數(shù)資料
型號: TPS40070PWPR
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝: GREEN, PLASTIC, HTSSOP-16
文件頁數(shù): 11/28頁
文件大?。?/td> 655K
代理商: TPS40070PWPR
SYNCHRONOUS RECTIFIER CONTROL
VDG03175
VOUT
1.8 V
10 A
1
2
3
4
16
15
14
13
ILIM
VDD
BOOST
HDRV
KFF
RT
LVBP
PG
TPS40070PWP
TPS40071PWP
5
6
7
8
12
11
10
9
SW
DBP
LDRV
PGND
SGND
SS
VFB
COMP
+
C3
22 nF
C5
5.6 nF
12 V
+
PWP
C7
10 pF
Q2
Si7856DP
Q1
Si7840DP
+
C6
4.7 nF
C4 470 pF
C12
22
F
C14
22
F
L1
COEV
DXM13061R6
1.6
H
C13
4.7 nF
C15
47
F
C16
470
F
C17
470
F
C18
0.1
F
C8
0.1
F
C9
1
F
C10
0.1
F
R6
165 k
R2
165 k
C2
0.1
F
R5
10 k
R3
5.49 k
R8
226
VDD
R7 8.66 k
R9
2 k
1.5
www.ti.com .................................................................................................................................................. SLUS582J – DECEMBER 2003 – REVISED APRIL 2009
Depending on which device is used the synchronous rectifier is controlled in slightly different ways. Table 2
describes the differences. For proper operation, the total gate charge of the MOSFET connected to LDRV should
be less than 50 nC.
Table 2. Synchronous Rectifier MOSFET States
SYNCHRONOUS RECTIFIER OPERATION DURING
DEVICE
SOFT-START
NORMAL
FAULT
OVERVOLTAGE
Turns OFF when IZERO detected
Turns Off when IZERO detected or
Turns OFF when IZERO detected or
TPS40070
OFF
or start of next cycle
start of next cycle
Turns OFF only at start of next
Turns OFF only at start of next cycle,
TPS40071
Turns OFF only at start of next cycle
ON
cycle
if duty cycle is > 0
Figure 14. 300 kHz, 12 V to 1.8 V
Copyright 2003–2009, Texas Instruments Incorporated
19
Product Folder Link(s): TPS40070 TPS40071
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TPS40074RHLT 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20
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