- 您现在的位置：买卖IC网 > PDF目录69535 > TSM121C (STMICROELECTRONICS) 0.05 A DUAL SWITCHING CONTROLLER, 140 kHz SWITCHING FREQ-MAX, PDIP24 PDF资料下载
参数资料
| 型号： | TSM121C |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A DUAL SWITCHING CONTROLLER, 140 kHz SWITCHING FREQ-MAX, PDIP24 |
| 封装： | PLASTIC, DIP-24 |
| 文件页数： | 3/12页 |
| 文件大小： | 126K |
| 代理商： | TSM121C |
TSM121
11/12
1.5. Output Driver - Open Collectors
The typical driving current from the TSM121 is
25mA. The recommended values of R12 to R16
are:
R12=R13=3.9k
, R14=R15=7.5k, R16=2k
2. Housekeeping Circuit
The TSM121 Housekeeping Circuit is dedicated to
3.3V, 5V, and 12V power lines protection. It inte-
grates a Precision Voltage reference (indepen-
dent from the PWM generator circuit Voltage Ref-
erence), a triple Over current Protection circuit, a
triple Over voltage Protection circuit, and a triple
Under voltage Protection circuit, as well as all the
necessary logic and transient timing management
circuits for optimal and secure communication
with the motherboard, during start up, switch off
and stabilized conditions.
2.1. Over current protection circuit
The Over current protection circuit is made of 3
comparators with internal voltage thresholds re-
quiring 3 different Sense resistors in series with
the 3 different power lines. The thresholds are in-
ternally fixed to the Vcs33, Vcs5, Vcs12 values,
and the sense resistors need to be chosen de-
pending on the required over current limit. The
outputs of these three comparators are ORed, and
blanked by an internal delay circuitry (Surge Cur-
rent Blanking - Tsur) which can be adjusted with
external components (Rsur, Csur). Note that the
three Over current protection circuits are blanked
from current surges by the same delay circuit. This
allows that during power up, large inrush currents
are allowed during a short period of time corre-
sponding to the charging of capacitive loads (see
figure 3).
The maximum output currents of the 12V, 5V, and
3.3V lines are determined by Rs12, Rs5 and Rs33
respectively:
I12max = Vcs12 / Rs12
I5max = Vcs5 / Rs5
I33max = Vcs33 / Rs33
2.2. Over voltage protection circuit
The Over voltage protection circuit is made of
three comparators with internal voltage thresholds
(Vov33, Vov5, Vov12) which do not require any
external components for proper operation. The
outputs of these three comparators are ORed.
2.3. Under voltage protection circuit
The Under voltage protection circuit is made of
three comparators with internal voltage thresholds
(Vuv33, Vuv5, Vuv12) which do not require any
external components for proper operation. The
outputs of these three comparators are ORed, and
blanked by an internal delay circuitry (Power Up
UV Blanking - Tuv) which can be adjusted with ex-
ternal components (Cuv). This allows that during
power up, the under voltage protection circuit is in-
hibited.
2.4. Logic Interface
The Over current, Over voltage and Under voltage
circuits outputs are again ORed before activating
a Latch. When activated, this latch commands the
full switch OFF of the three main power lines
(3.3V, 5V, 12V) by an internal link between the
Housekeeping and the PWM circuits. Note that
the Under voltage circuit, after power up UV blank-
ing, bears no other delay to the Latch setting input
whereas the Over current and Over voltage cir-
cuits both bear an additional Tfault delay time.
This allows an efficient protection against Output
Short Circuit Conditions.
The Over current, Over voltage and Under voltage
circuits are all ORed to switch the Power Good
output active (PG) to warn the motherboard that
the voltage of at least one of the three power line
is out of range. The PG activation bears an inter-
nal Tpg delay circuitry which can be adjusted with
external components (Cpg)
Thanks to this information link to the motherboard,
a resetting signal to the latch is achievable with
the Remote pin (REM). When the Remote pin is
active, the internal Fault link between Housekeep-
ing circuit and the PWM generator is active (high:
PWM off), the PG pin is active (high). Note that to
reset effectively the Latch, a minimum width Re-
mote pulse should be applied thanks to an internal
delay circuitry (Trem) which can be adjusted with
external components (Crem).
2.5. Additional circuits:
A Power Input (PI) is available for a supplementa-
ry power condition supervision. For example, the
supervision of the Vcc power supply line.
An Extra Protection (EP) circuit is available for an
additional input power protection. For example,
this operator can be used for the supervision of
the primary input power via an additional wiring at
the foot of the power half bridge. This operator can
also be used for the supervision of eventual nega-
tive power lines (ex: -5V or -12V).
相关PDF资料 |
PDF描述 |
|---|---|
| TSP9125PWR | SWITCHING REGULATOR, PDSO14 |
| TWL2203GGV | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA64 |
| TWL2203GGVR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA64 |
| TXS100ZA-R3H | 1-OUTPUT 150 W DC-DC REG PWR SUPPLY MODULE |
| TXS100ZB-NP21V | 1-OUTPUT 180 W DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TSM121CN | 功能描述:开关变换器、稳压器与控制器 0.5A Switching Cont RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TSM122 | 制造商:Ssac 功能描述: |
| TSM-122-01-F-DH-A | 制造商:Samtec Inc 功能描述:CONN UNSHRD HDR HDR 44 POS 2.54MM SLDR RA SMD - Bulk |
| TSM-122-01-F-DV | 制造商:Samtec Inc 功能描述:.025 SQ. TERMINAL STRIPS - Bulk |
| TSM-122-01-F-DV-A | 制造商:Samtec Inc 功能描述:CONN UNSHRD HDR HDR 44 POS 2.54MM SLDR ST SMD - Bulk |
发布紧急采购，3分钟左右您将得到回复。