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UC3825BDW 数据手册 - TI(德州仪器)
制造商:
TI(德州仪器)
分类:
DC/DC转换器
封装:
SOIC-16
描述:
Texas Instruments隔离式回扫电源控制器提供恒定电压 (CV) 和恒定电流 (CC) 输出调节,用于提高对较大负载阶跃的瞬时响应。 初级侧调节 (PSR) 无需光耦合器。### 回扫控制器,Texas Instruments电流模式和电压模式 PWM 控制器 初级侧调节 峰值功率模式 低功率
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引脚图在P2Hot
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型号编码规则在P2
标记信息在P12P13P14P15P16
封装信息在P12P13P14P15P16P17P18
技术参数、封装参数在P3
应用领域在P16P19
电气规格在P4P5
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UC3825BDW数据手册
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UC1823A, UC2823A, UC2823B,
UC3823A, UC3823B, UC1825A,
UC2825A, UC2825B, UC3825A, UC3825B
SLUS334E − AUGUST 1995 − REVISED SEPTEMBER 2010
www.ti.com
6
APPLICATION INFORMATION
The oscillator of the UC3823A, UC3823B, UC3825A, and UC3825B is a saw tooth. The rising edge is governed by a current
controlled by the RT pin and value of capacitance at the CT pin (C
CT
). The falling edge of the sawtooth sets dead time for
the outputs. Selection of RT should be done first, based on desired maximum duty cycle. CT can then be chosen based
on the desired frequency (RT) and D
MAX
. The design equations are:
R
T
+
3V
(
10 mA
)
ǒ
1 * D
MAX
Ǔ
C
T
+
ǒ
1.6 D
MAX
Ǔ
ǒ
R
T
f
Ǔ
Recommended values for R
T
range from 1 kΩ to 100 kΩ. Control of D
MAX
less than 70% is not recommended.
UDG−95102
Figure 1. Oscillator
10 M
1 M
100 k
10 k
1 k
10 k
100 k
Figure 2
R
T
− Timing Resistance − W
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
f − Frequency − Hz
Figure 3
1 k 10 k
70
75
80
85
90
95
100
100 k
D
MAX
− Maximum Duty Cycle − %
R
T
− Timing Resistance − W
MAXIMUM DUTY CYCLE
vs
TIMING RESISTANCE
(1)
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