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| 型號(hào)： | TPS2383PMR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP64 |
| 封裝： | GREEN, PLASTIC, LQFP-64 |
| 文件頁(yè)數(shù)： | 26/28頁(yè) |
| 文件大?。?/td> | 397K |
| 代理商： | TPS2383PMR |
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TPS2383
SLUS559B APRIL 2003 REVISED JULY 2004
7
www.ti.com
TERMINAL FUNCTIONS (continued)
TERMINAL
I/O
DESCRIPTION
NAME
PIN
I/O
DESCRIPTION
PORT ANALOG SIGNALS (continued)
1G
3
O
2G
6
O
3G
11
O
Port gate. Connect to the gate of an external N-channel MOSFET. During turn-on, this pin is controlled by a
linear current amplifier (LCA) such that the load current ramps up from zero to a maximum sourcing current of
4G
14
O
linear current amplifier (LCA) such that the load current ramps up from zero to a maximum sourcing current of
425 mA. This pin is driven to as high as 10 V. During controlled turn-off, this pin is driven such that the load
5G
35
O
425 mA. This pin is driven to as high as 10 V. During controlled turn-off, this pin is driven such that the load
current ramps down from a maximum of 425 mA to zero. The capacitor on the CR pin is utilized to generate the
ramp control signal voltages. During a fault turn-off this pin is discharged quickly with a low on-resistance
6G
38
O
ramp control signal voltages. During a fault turn-off this pin is discharged quickly with a low on-resistance
internal switch.
7G
43
O
internal switch.
8G
46
O
1RS
4
I
2RS
5
I
3RS
12
I
Port resistor sense. This is the kelvin sense path for the high potential end of the load current sense resistor.
4RS
13
I
Port resistor sense. This is the kelvin sense path for the high potential end of the load current sense resistor.
Parameters controlled by the load current sense resistor include: the average undercurrent/overcurrent and
5RS
36
I
Parameters controlled by the load current sense resistor include: the average undercurrent/overcurrent and
peak-load current thresholds, the peak PD inrush current limit during startup, and the nominal classification
current levels. Use a 0.5-
load current sense resistor to be compliant to the 802.3 specification levels.
6RS
37
I
peak-load current thresholds, the peak PD inrush current limit during startup, and the nominal classification
current levels. Use a 0.5-
load current sense resistor to be compliant to the 802.3 specification levels.
7RS
44
I
8RS
45
I
ANALOG SIGNALS
CR
50
I
Ramp capacitor. During load power up and down, this capacitor is used as the di/dt current slew capacitor. A
1.5-V peak triangular waveform is present on this pin during ramp up/down. Connect a 0.1-
F capacitor from
this pin to AG2 and a 120-k
resistor at RT to meet the 802.3af specification timing levels.
CT
52
I
Timing capacitor. This capacitor and the resistor on the RT pin set the internal clock frequency of the device.
This clock is used for the internal state machine, integrating A/D counters, POR time-out, and fault and delay
timers of each port. Use a 100-pF to 470-pF capacitor for CT and a 120-k
resistor on RT to set the internal
clock in a range of 100 kHz to 500 kHz. This timing can be overridden by driving the CT pin with a 0 V to 5 V
square wave with a frequency from 0 kHz to 500 kHz.
CINT
30
I
This capacitor is used for the ramp A/D converter signal integration. Connect a 0.033-
F capacitor from this pin
to RG. For minimal errors due to dielectric absorption, use a poly or Teflon capacitor type. Ceramic types can be
used, but note the increased conversion error.
L1
17
O
L2
18
O
L3
19
O
L4
20
O
LED lamp drivers. Dual or single color LEDs can be connected to each of these pins. Each pin indicates the
state of the corresponding port. This is a tri-state port that is under full control of the host micro-controller. As
L5
21
O
state of the corresponding port. This is a tri-state port that is under full control of the host micro-controller. As
such it can also be used as a data port, or general-purpose output driver.
L6
22
O
such it can also be used as a data port, or general-purpose output driver.
L7
23
O
L8
24
O
RD
32
I
The discovery current-sense resistor is connected in the path from the RD pin to RG ground. The discovery
current-sense resistor sets the discovery value to 25-k
(nominal) when a 665- value is used. For best noise
performance, de-couple this pin with a 0.68-
F, ceramic capacitor to RG ground.
RT
31
I
Bias set resistor. This resistor sets all precision bias currents within the device. This pin is forced to an internal
1.25-V reference voltage level. The current that flows into this resistor due to the applied 1.25-V bias is
replicated and used throughout the device. This resistor also works in conjunction with the capacitors on CR,
CT and CINT to set internal timing values. Use a 120-k
resistor to be compliant to the requirements of 802.3af.
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