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参数资料
| 型号： | TPS2066ADRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 24/25页 |
| 文件大小： | 1100K |
| 代理商： | TPS2066ADRG4 |
OVERCURRENT
OCx RESPONSE
UNDERVOLTAGE LOCKOUT (UVLO)
Enable (ENx or ENx)
THERMAL SENSE
SLVS798F – JANUARY 2008 – REVISED NOVEMBER 2008 ........................................................................................................................................... www.ti.com
When an overcurrent condition is detected, the device maintains a constant output current and reduces the
output voltage accordingly. Three possible overload conditions can occur.
In the first condition, the output has been shorted before the device is enabled or before voltage is applied to IN.
The device senses the short and immediately switches into a constant-current output. In the second condition, a
short or an overload occurs while the device is enabled. At the instant the overload occurs, high currents may
flow for several microseconds before the current-limit circuit can react. The device operates in constant-current
mode after the current-limit circuit has responded. In the third condition, the load is increased gradually beyond
the recommended operating current. The current is permitted to rise until the current-limit threshold is reached.
The devices are capable of delivering current up to the current-limit threshold without damage. Once the
threshold is reached, the device switches into constant-current mode.
Complete shutdown occurs only if the fault is present long enough to activate thermal limiting. The device will
remain off until the junction temperature cools approximately 10°C and will then re-start. The device will continue
to cycle on/off until the overcurrent condition is removed.
Each OCx open-drain output is asserted (active low) during an overcurrent or overtemperature condition on that
channel. The output remains asserted until the fault condition is removed. The TPS206xA eliminates false OCx
reporting by using internal delay circuitry after entering or leaving an overcurrent condition. This "deglitch" time is
approximately 8-ms. This ensures that OCx is not accidentally asserted due to normal operation such as starting
into a heavy capacitive load. Overtemperature conditions are not deglitched and assert and de-assert the OCx
signal immediately.
The undervoltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO
turn-on threshold. Built-in hysteresis prevents unwanted on/off cycling due to input voltage drop from large
current surges.
The logic enable controls the power switch, bias for the charge pump, driver, and other circuits to reduce the
supply current. The supply current is reduced to less than 5
A when a logic high is present on ENx, or when a
logic low is present on ENx. A logic low input on ENx or a logic high input on ENx enables the driver, control
circuits, and power switch for that channel.
The TPS206xA monitors the operating temperature of both power distribution switches with individual thermal
sensors. The junction temperature of each channel rises during an overcurrent or short-circuit condition. When
the die temperature of a particular channel rises above a minimum of 135°C in an overcurrent condition, the
internal thermal sense circuitry disables the individual channel in overtemperature to prevent damage. Hysteresis
is built into the thermal sensor and re-enables the power switch individually after it has cooled approximately
10°C. The power switch cycles on and off until the fault is removed. This topology allows one channel to continue
normal operation even if the other channel is in an overtemperature condition. The open-drain overcurrent flag
(OCx) is asserted (active low) corresponding to the channel that is in an overtemperature or overcurrent
condition.
8
Copyright 2008, Texas Instruments Incorporated
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