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參數(shù)資料
| 型號： | TPS2306DWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 29/29頁 |
| 文件大小： | 427K |
| 代理商： | TPS2306DWG4 |
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TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
SLVS368 APRIL 2001
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
constant-current source level and overcurrent threshold programming
Constant-current source level and fault level programming is accomplished using the IMAXx input pins in
conjunction with the IREF pin. An external resistor connected between the IREF pin and ground is used to
program the internal reference current to a user-selectable value. As shown in the block diagram, the TPS2306
sources current from the IREF pin to maintain a 1.5-V level at this pin. This current is then mirrored to generate
two current sources driving a differential switch on each of the device channels. When the device is enabled,
these sources generate a sink current of magnitude (1.1)
× (1.5 V/RREF) at each of the IMAXx inputs. Typical
values for the programmed reference current are between 35
A and 300 A.
External resistors (RIMAX1 and RIMAX2 in the typical application diagram) connected between the IMAX1 and
IMAX2 pins and the corresponding input voltage rails develop a voltage drop relative to that supply potential.
This drop programs the current level to be sourced to the load. During constant-current operation, the linear amp
slews to limit the voltage across the external sense resistor to the voltage across the corresponding RIMAX
resistor, thus limiting the load current.
Slew rate control of the start-up inrush current (soft-start), is easily achieved with the addition of a capacitor
across the IMAX programming resistor (CSS1 and CSS2 in the Figure 2 application diagram). This applies an
RC time constant to the ramp-up of the voltage at the IMAX pin, and a corresponding RC characteristic on the
inrush transient during ramp-up of the output voltages. Since the IMAXx pin current sink is off until each channel
is commanded ON by the UPx comparators, the soft-start cap remains discharged until turn-on, regardless of
whether start-up is due to a live insertion event, or remote turn-on of a unit whose supply inputs have been
charged indefinitely. No additional soft-start reset components are required.
The overcurrent comparator thresholds are established in a similar manner, except that an internal fixed resistor
sets the overcurrent threshold (see R1 and R2 in the block diagram). The IMAX programming current also flows
through the overcurrent threshold resistors, generating a reference level that is offset from the corresponding
IMAX reference. These internal resistors have a nominal 2.5-k
value, so the comparator thresholds are a
nominal (2500
× IREF) V above the fault threshold. Note that since the reference current is programmable, the
user has modest control of the overcurrent threshold for a given sense resistor value.
supply sequencing
Control of both the power up and power down sequence of the two supplies is provided via the four sequencing
inputs, UP1, UP2, DOWN1, and DOWN2. Each channel’s external pass element is ramped on when the ENBL
input is asserted, and the voltage at the corresponding UPx pin exceeds the nominal 1.5-V reference threshold.
The turn-off of the two supplies may also be initiated via the ramp-up comparators; however, for more
autonomous operation, the DOWNx inputs are used. When the device ENBL signal is deasserted, the outputs
of the ramp-down comparators (DN1 and DN2) are gated to the LCA control logic (see block diagram). When
the voltage at either DOWNx input drops below a nominal 0.5 V, that channel’s LCA is disabled, and the pass
element’s gate is subsequently discharged by a 10-
A pull-down current.
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