- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384528 > ISL6752AAZA-T (INTERSIL CORP) ZVS Full-Bridge Current-Mode PWM with Adjustable Synchronous Rectifier Control PDF資料下載
參數(shù)資料
| 型號： | ISL6752AAZA-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | ZVS Full-Bridge Current-Mode PWM with Adjustable Synchronous Rectifier Control |
| 中文描述： | 0.1 A DUAL SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, QSOP-16 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 436K |
| 代理商： | ISL6752AAZA-T |
14
FN9181.1
March 10, 2005
in the primary must find an alternate path. The current flows
into the parasitic switch capacitance which charges the node
to VIN and then forward biases the body diode of upper
switch UL. The primary leakage inductance, L
L
, maintains
the current, which now circulates around the path of switch
UR, the transformer primary, and switch UL. When switch LL
opens, the output inductor current free-wheels through both
output diodes, D1 and D2. This condition persists through
the remainder of the half-cycle.
When the upper switches toggle, the primary current that
was flowing through UR must find an alternate path. It
charges/discharges the parasitic capacitance of switches UR
and LR until the body diode of LR is forward biased. If
RESDEL is set properly, switch LR will be turned on at this
time.
The first power transfer period commences when switch LR
closes and the cycle repeats. The ZVS transition requires
that the leakage inductance has sufficient energy stored to
fully charge the parasitic capacitances. Since the energy
stored is proportional to the square of the current (1/2 L
L
I
P2
,
the ZVS resonant transition is load dependent. If the leakage
inductance is not able to store sufficient energy for ZVS, a
discrete inductor may be added in series with the
transformer primary.
Synchronous Rectifier Outputs and Control
The ISL6752 provides double-ended PWM outputs, OUTLL
and OUTLR, and synchronous rectifier (SR) outputs,
OUTLLN and OUTLRN. The SR outputs are the
complements of the PWM outputs. It should be noted that
the complemented outputs are used in conjunction with the
opposite PWM output, i.e. OUTLL and OUTLRN are paired
together and OUTLR and OUTLLN are paired together.
Referring to Figure 16, the SRs alternate between being
both on during the free-wheeling portion of the cycle
(OUTLL/LR off), and one or the other being off when OUTLL
or OUTLR is on. If OUTLL is on, its corresponding SR must
also be on, indicating that OUTLRN is the correct SR control
signal. Likewise, if OUTLR is on, its corresponding SR must
also be on, indicating that OUTLLN is the correct SR control
signal.
A useful feature of the ISL6752 is the ability to vary the
phase relationship between the PWM outputs (OUTLL, OUT
LR) and the their complements (OUTLLN, OUTLRN) by
±300ns. This feature allows the designer to compensate for
differences in the propagation times between the PWM FETs
and the SR FETs. A voltage applied to VADJ controls the
phase relationship.
FIGURE 14. UR - UL FREE-WHEELING PERIOD
VIN+
VIN-
UL
LL
UR
LR
VOUT+
RTN
I
P
I
S
L
L
D2
D1
VIN+
VIN-
UL
LL
UR
LR
VOUT+
RTN
I
P
I
S
L
L
D2
D1
FIGURE 15. UPPER SWITCH TOGGLE AND RESONANT
TRANSITION
FIGURE 16. BASIC WAVEFORM TIMING
CT
OUTLL
OUTLR
OUTLLN
(SR1)
OUTLRN
(SR2)
FIGURE 17. WAVEFORM TIMING WITH PWM OUTPUTS
DELAYED, 0V < VADJ < 2.425V
CT
OUTLL
OUTLR
OUTLLN
(SR1)
OUTLRN
(SR2)
ISL6752
相關PDF資料 |
PDF描述 |
|---|---|
| ISL6752AAZA | Octal Buffers/Drivers With 3-State Outputs 20-PDIP -40 to 85 |
| ISL6753 | Octal Buffers/Drivers With 3-State Outputs 20-SO -40 to 85 |
| ISL6753AAZA-T | ZVS Full-Bridge PWM Controller |
| ISL6753AAZA | Octal Buffers/Drivers With 3-State Outputs 20-SO -40 to 85 |
| ISL6801AB | High Voltage Bootstrap High Side Driver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6752AAZA-TR5325 | 制造商:Intersil Corporation 功能描述:ZVS Full-Bridge Current-Mode PWM with Adjustable Synchronous Rectifier Control |
| ISL6752DBEVAL1Z | 功能描述:BOARD DEMO FOR ISL6752 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 標準包裝:1 系列:- 主要目的:DC/DC，步降 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:3.3V 電流 - 輸出:3A 輸入電壓:4.5 V ~ 28 V 穩(wěn)壓器拓撲結構:降壓 頻率 - 開關:250kHz 板類型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名稱:497-12113STEVAL-ISA094V1-ND |
| ISL6752EVAL1Z | 功能描述:EVALUATION BOARD FOR ISL6752 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標準包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL6753AAZA | 功能描述:IC REG CTRLR PWM CM/VM 16-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6753AAZA-T | 功能描述:IC REG CTRLR PWM CM/VM 16-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復。