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参数资料
| 型号： | TSM108IDT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 130 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | PLASTIC, MICRO, SOP-14 |
| 文件页数： | 12/13页 |
| 文件大小： | 387K |
| 代理商： | TSM108IDT |
TSM108
8/13
7. Standby Mode
In order to reduce to a minimum the current con-
sumption of the TSM108 when in inactive phase,
the Standby mode (!Stby pin of TSM108) imposes
a complete OFF state of the P-Channel MOSFET,
as well as a complete shut off of the main func-
tions of the TSM108 (operational amplifier, PWM
generator and oscillator, UVLO and OVLO) and
therefore reduces the consuption of the device.
The !STBY command is TTL compatible.
8.Power Transistor: P-channel MOSFET or
PNP Transistor?
The TSM108 can drive, with minor external com-
ponents change, either a P-channel MOSFET, or
a PNP transistor. The user can choose the type of
external power element, nevertheless, here fol-
lows a few considerations which will help to take
this decision
The following figures shows two different sche-
matics where both driving abilities of TSM108 are
shown. The third schematic shows how to improve
the switch off commutation when using a bipolar
PNP transistor.
P-channel MOSFET
PNP transistor
The most immediate way to choose between a
P-channel MOSFET or a PNP transistor is to con-
sider the ratio between the output power of the ap-
plication and the expected components price: the
lower the power, the more suitable the PNP tran-
sistor is; the higher the power, the more suitable
the P-channel MOSFET is. As an example, for a
DC/DC adaptor built for 12V/6V, the recommend-
ed limit to choose between P-channel Mosfet and
PNP transistor is around 200mA.
Below 200mA, the price/performance ratio of the
PNP transistor is very attractive, whereas above
200mA, the P-channel Mosfet takes the advan-
tage.
9. Calculation of the Passive Elements
Let's consider the following characteristics for a
Cigarette Lighter Cellular Phone Battery Charger:
Vin = 12V - input voltage of the converter
Vout = 6V - output voltage of the converter
F = 100kHz - switching frequency of the converter
adjustable with an external capacitor
Iout = 625mA - output current limitation
L1
GD
D1
TSM108
Q1
MOSFET P
Q1
L1
GD
D1
TSM108
Q1
L1
GD
D1
TSM108
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TSM108IDTH | 制造商:STMicroelectronics 功能描述:VOLTAGE AND CURRENT STEPDOWN PWM CONTROLLER |
| TSM109 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DUAL COMPARATOR AND VOLTAGE REFERENCE |
| TSM10-9.5-520-TR | 制造商:E-Switch Inc 功能描述:SWITCH TACTILE 制造商:E-Switch Inc 功能描述:TSM Series |
| TSM109_04 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Dual Comparator and Voltage Reference |
| TSM-109-01 -L-SH-K-TR | 制造商:Samtec Inc 功能描述:CONN UNSHRD HDR HDR 9 POS 2.54MM SLDR RA SMD - Tape and Reel |
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