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參數(shù)資料
| 型號： | UCC3925 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | HIGH-VOLTAGE HOT-SWAP POWER MANAGER |
| 中文描述： | 高壓熱插拔電源管理器 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 153K |
| 代理商： | UCC3925 |
SLUS471 – NOVEMBER 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
logic command to turn on power-to-load
Three logic inputs enable the load: INSA, INSB, and ON. To turn on the load, INSA and INSB must be lower
than a TTL threshold above –VIN and ON must be more than a TTL threshold above GND.
overvoltage/undervoltage lockout
In addition to the logic inputs INSA, INSB, and ON, two other inputs enable load current: OVLO and UVLO.
Specifically, OVLO must be less than 1.25 V with respect to –VIN and UVLO must be more than 1.25 V with
respect to –VIN to enable load current. These pins can be used as logic inputs or as precision overvoltage
shutdown and undervoltage lockout inputs by connecting these inputs to a voltage divider from GND to –VIN.
enable downstream power converter
The IC has five outputs to enable downstream power converters or loads. These outputs are open-drain
active-low drivers. During power–up, all five outputs are high–impedance. When load current is ramped up to
maximum command and the output power FET has V
DS
< 1 V, C
SEQTIME
starts to charge and PG1 immediately
asserts low. When C
SEQTIME
charges up to 1 V, PG2 asserts low. When C
SEQTIME
charges up to 2 V, PG3
asserts low. When C
SEQTIME
charges up to 3 V, PG4 asserts low and when C
SEQTIME
charges up to 4 V, PG4
asserts low.
reference output
REF is a voltage reference output 5 V higher than –VIN. This output is enabled whenever –VIN to GND is
greater than 20 V. This reference can be used as a bias for cascode devices to buffer low-voltage logic outputs.
This reference should not be loaded with more than 50
μ
A.
programming for downstream load sequencing
These outputs turn on sequentially, with PG1 turning on first, PG2 second, etc. The delay from PG1 to PG2
is the time required to charge the capacitor from SEQTIME to –VIN by 1 V. SEQTIME is pulled high through
a 10-
μ
A current source, so the delay between output enables is C/10
μ
A.
negative supply input
–VIN is the negative supply input to the IC. All signals are measured with respect to –VIN except ON. In positive
supply systems, –VIN is the ground input to the IC.
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