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参数资料
| 型号： | TSI206 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQFP32 |
| 封装： | LQFP-32 |
| 文件页数： | 4/28页 |
| 文件大小： | 286K |
| 代理商： | TSI206 |
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Tsi206 Primary Side Monitor with Inrush Control
Datasheet
- 12 -
Tundra Semiconductor Corporation
80C7000_MA001_01 April 2006
Functional description
The Tsi206 is a primary side monitoring device
which supports the PI-Link isolated communication
interface to a secondary side power management
controller. It controls card inrush current using an
external MOSFET and current sense resistor. It
also provides control for an intermediate bus power
converter.
shows
the
functional block diagram of the Tsi206.
Note: The term inrush current refers to the
momentary surge current that occurs when the
input voltage is first applied to a card. This current
is required to charge the input capacitors on the
card, indicated as C4 in Figure 1 on page 1. If
inrush limiting is not provided, the inrush current
can be very high and can cause damage or
malfunction.
Figure 1 on page 1 shows a typical application,
including the isolated interface to the secondary
side using a transformer. Figure 1 also shows the
enable connection to the brick, and the shutdown
signal from the secondary side. Resistor dividers
17
IC_VDD
Internal connection — connect to pin 25 (VDD)
18
IC_VSS
Internal connection — connect to VSS
19
IC_VSS
Internal connection — connect to VSS
20
SENSE_P
Positive input to internal current sense amplifier
21
SENSE_OUT
This pin is the output of the internal current sense amplifier.
22
SENSE_N
Negative input to internal current sense amplifier
23
SHUNT
This pin connects to the drain of an internal shunt transistor. It normally connects to pin
25 as internal shunt regulator for VDD.
24
VSS
This pin connects to -48 V (ground reference for the Tsi206)
25
VDD
3.3 V power — normally connects to pin 14
(Tsi206 uses internal shunt regulator and external resistor from 48 V input)
26
CT
This pin connects to a capacitor that provides a time-out for the inrush and circuit
breaker functions; it is used to detect a fault condition.
27
POR
This pin connects to an external capacitor for power-on reset — recommended value
is 47 nF.
28
BUSOFF
This pin connects to an external optocoupler to receive a shutdown signal from the
Tsi257. A logic high on the BUSOFF pin disables the intermediate bus brick.
29
SEAT
This pin can be connected as either a high or a low SEAT pin. External resistors must
be used if required to ensure voltage remains below 3.3 V.
The Tsi206 must detect a valid seat input before it can generate the brick enable signal.
A digital debounce is provided — refer to Table 6 on page 16.
30
FETA
This pin is used to monitor VGS of the external inrush FET to detect when inrush is
complete.
31
BIAS
This pin sets the bias current for the device — refer to Table 8 on page 23 for
recommended bias resistor.
32
VBG
This pin is the 1.2 V bandgap reference output, and is normally left open.
Table 5 — Pin functions (Continued)
Pin
Pin name
Description
(Sheet 2 of 2)
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