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参数资料
| 型号： | TC105333ECTTR |
| 厂商： | Microchip Technology |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM SOT23A-5 |
| 标准包装： | 3,000 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 345kHz |
| 占空比： | 100% |
| 电源电压： | 2.2 V ~ 10 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 带卷 (TR) |
TC105
4.0
4.1
APPLICATIONS
Circuit Examples
FIGURE 4-1:
SOFT START CIRCUIT
R SS
470K
Figure 4-3 shows a TC105 using a PNP switching
transistor (Zetex FZT749) that has an h FE of 180 and
V CESAT of 100 mV at I C = 1A. Other high beta transis-
4
+
–
C SS
0.033 μ F
V IN
tors can be used, but the values of R B and C B may
need adjustment if h FE is significantly different from that
of the FZT749.
The circuit of Figure 4-4 utilizes a P-channel MOSFET
SHDN/SS
TC105
switching transistor (Silconix Si9430). This transistor is
a member of the Littlefoot? family of small outline
Shutdown Not Used
R SS
MOSFETs.
470K
SHDN
4
SHDN/SS
+
–
C SS
0.033 μ F
OFF ON
(From System
Control Logic)
TC105
Shutdown Used
FIGURE 4-2:
EXTERNAL TRANSISTOR CONNECTION
V IN
P
D
L
+
–
C L
V OUT
V IN
Q
D
L
+
–
C L
V OUT
TC105
R B
+
–
C B
TC105
DS21349B-page 6
EXT
1
P-Channel MOSFET
EXT
1
PNP Bipolar Transistor
2002 Microchip Technology Inc.
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