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參數(shù)資料
| 型號(hào)： | UCC28089DRB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PRIMARY-SIDE PUSH-PULL OSCILLATOR WITH DEAD-TIME CONTROL |
| 中文描述： | 一次側(cè)推拉振蕩器死區(qū)時(shí)間控制 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 336K |
| 代理商： | UCC28089DRB |
SLUS623 SEPTEMBER 2004
9
www.ti.com
APPLICATION INFORMATION
Program the oscillator frequency of the UCC28089 to equal the desired switching frequency of the output post
regulator. The secondary-side controller may also need corresponding switching frequency programming, such
as RAMP and G2C capacitor values for the UCC2540. Program the dead time to be approximately 1/4 of the
resonant period of the equivalent parasitic LC circuit that is established by the primary leakage inductance of
the transformer and the total drain-source capacitance of the primary-side power MOSFET transistors (C
OSS
+ stray capacitances). Remember that C
OSS
predictably varies over input line voltage. If the variation is too great
and/or 1/4 the resonant period is less than 100 ns, connect additional capacitance (C
R1
and C
R2
in Figure 2)
between the drain and source of the primary transistors, which stabilizes the capacitance and raise the total
capacitance value.
If the secondary-side controller is compatible with pulse edges, the pulse edge transformer circuit in Figure 3
can provide an isolated pulse edge signal on the secondary side using a transformer core that is 6-mm diameter
or less. The recommended transformer (COEV #MGBBT0001101) is compatible with all switching frequencies
and it is smaller than many opto-isolators.
UCC28089
R1
634
C1
680 pF
1
5
GND
GND1
Primary Ground
Secondary Ground
UCC2540
SYNCIN
REF
SYNC
4
2
QCL
2N3904
T1
1:1
RCB
422
RBE
115
L1
15uH
Figure 3. Isolation and clamping the SYNC signal for Cascaded Buck Converters
Notice that the peak-pulse voltage is proportional to the UCC28089 bias voltage. The circuit in Figure 3 is well
suited to the full VDD bias voltage range of the UCC28089 bias voltage because it has a clamp circuit. The clamp
circuit in Figure 3 (R
CB
, R
BE
and Q
CL
) is a V
BE
clamp rather than a Zener diode. A V
BE
clamp is used here
because it has much lower capacitance than typical Zener diodes so that the clamp does not affect the narrow
50-ns pulse width. The clamp may be replaced by a single resistor in applications, as in Figure 2, where the VDD
bias voltage of the UCC28089 is regulated within a +/5% window.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC28089DRBR | 制造商:Texas Instruments 功能描述:PRIMARY SIDE PUSH-PULL DRIVER WITH DEAD-TIME CONTROL - Tape and Reel |
| UCC28089DRBT | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UCC28089DRG4 | 功能描述:功率驅(qū)動(dòng)器IC Primary Side P-P Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| UCC2808A-1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW POWER CURRENT MODE PUSH-PULL PWM |
| UCC2808A-1EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW POWER CURRENT MODE PUSH-PULL PWM |
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