參數(shù)資料
型號: ISL6744ABZ
廠商: INTERSIL CORP
元件分類: 穩(wěn)壓器
英文描述: Octal Buffers/Drivers With 3-State Outputs 20-SOIC -40 to 85
中文描述: 1 A SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO8
封裝: GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù): 14/18頁
文件大?。?/td> 403K
代理商: ISL6744ABZ
14
FN9147.8
September 22, 2005
Waveforms
Typical waveforms can be found in the following Figures.
Figure 13 shows the output voltage ripple and noise at a 5A.
Figures 14 and 15 show the voltage waveforms at the
switching node shared by the upper FET source and the
lower FET drain. In particular, Figure 15 shows near ZVS
operation at 5A of load when the upper FET is turning off
and the lower FET is turning on. ZVS operation occurs
completely, implying that all the energy stored in the node
capacitance has been recovered. Figure 16 shows the
switching transition between outputs, OUTA and OUTB
during steady state operation. The deadtime duration of
46.9ns is clearly shown.
A 2.7V zener is added between the Vdd pins of ISL6700 and
ISL6744, in order to ensure that the PWM turns on only after
the driver has turned on, thereby ensuring the soft-start
function. Figure 17 shows the soft-start operation.
FIGURE 12. LINE REGULATION AT I
OUT
= 1A
13.5
13
12.5
12
11.5
10.5
42
44
45
46
47
48
49
50
51
53
INPUT VOLTAGE (V)
O
43
11
52
FIGURE 13. OUTPUT RIPPLE AND NOISE - 20MHz BW
FIGURE 14. FET DRAIN-SOURCE VOLTAGE
FIGURE 15. FET D-S VOLTAGE NEAR-ZVS TRANSITION
FIGURE 16. OUTA - OUTB TRANSITION
ISL6744
相關(guān)PDF資料
PDF描述
ISL6744AU Octal Buffers/Drivers With 3-State Outputs 20-SOIC -40 to 85
ISL6744AUZ Octal Buffers/Drivers With 3-State Outputs 20-SOIC -40 to 85
ISL6745 Octal Buffers/Drivers With 3-State Outputs 20-SOIC -40 to 85
ISL6752 Octal Buffers/Drivers With 3-State Outputs 20-PDIP -40 to 85
ISL6752AAZA-T ZVS Full-Bridge Current-Mode PWM with Adjustable Synchronous Rectifier Control
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