参数资料
型号: UCC28250RGPT
厂商: Texas Instruments
文件页数: 18/53页
文件大小: 0K
描述: IC REG CTRLR PWM CM/VM 20-QFN
标准包装: 1
PWM 型: 电流/电压模式
输出数: 1
频率 - 最大: 1MHz
占空比: 100%
电源电压: 4.7 V ~ 17 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 20-VFQFN 裸露焊盘
包装: 标准包装
其它名称: 296-27777-6
SLUSA29C – APRIL 2010 – REVISED JULY 2011
CS: Current Mode Control
For current mode control, the RAMP/CS pin is driven by a signal representative of the transformer primary-side
current. The current signal has to have compatible input range of the COMP pin. As shown in Figure 12 , the
COMP pin voltage is used as the reference for peak current. The primary-side signals OUTA and OUTB are
turned on by the internal clock signal and turned off when sensed peak current reaches the COMP pin voltage.
Choose the current sense transformer turns ratio (1:n) and the burden resistor value (R B ) based on the peak
current at maximum load I MAX . Refer to the Functional Description section for more details on the current mode
control.
R B =
3V
I MAX / n
(7)
COMP
CS
OUTA
OUTB
Figure 12. Peak Current Mode Control and PWM Generation
REF/EA+ (1/8)
REF/EA+ is the non-inverting input of the UCC28250 ’ s internal error amplifier.
When the UCC28250 is configured for secondary-side control, the internal error amplifier is used as the control
loop error amplifier. Connect REF/EA+ directly to the VREF pin to provide the reference voltage for the feedback
loop.
When the UCC28250 is configured for primary-side control, the error amplifier is connected as a voltage follower.
Connect REF/EA+ to the opto-coupler output.
The voltage range on REF/EA+ pin is 0 V to 3.7 V.
18
Product Folder Link(s): UCC28250
Copyright ? 2010 – 2011, Texas Instruments Incorporated
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