Texas Instruments UCC39002 Evaluation Module UCC39002EVM UCC39002EVM 데이터 시트
제품 코드
UCC39002EVM
SLUU166A - December 2003 − Revised February 2004
5
UCC39002 Advanced Load-Share Controller User’s Guide, HPA027A
3
Applications
This user’s guide will enable the user to select components to successfully parallel power modules that have
the following features:
the following features:
D
Remote sense
D
Output voltages greater than 1 V, but less than 15 V
D
An output stage that sources output current only, allowing for paralleling of converters and ensuring one
converter does not sink current from another converter.
converter does not sink current from another converter.
D
Available minimum 5-V bus for controller bias voltage, or use of the output voltage of the modules for bias
when the output of the modules is between 5 V and 15 V.
when the output of the modules is between 5 V and 15 V.
4
Features
D
High accuracy, better than 1% current-share error at full load
D
High-side current sensing
D
Ultra-low offset current sense amplifier
D
Single wire load-share bus
D
Intel
SSI load-share specification compliant
D
Disconnect from load-share bus at stand-by
D
Load-share bus protection against shorts to GND or to the supply rail
D
8-pin MSOP package option minimizes board space
D
External or internal bias selection
D
External shutdown switch for each module
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Schematic
A schematic of a typical load-share design, where the outputs of three modules are being shared, is shown in
Figure 1. Note that one load-share controller is required for each module and the circuits are identical when three
identical modules are used. Terminals J1 and J2 are connected to the +V
Figure 1. Note that one load-share controller is required for each module and the circuits are identical when three
identical modules are used. Terminals J1 and J2 are connected to the +V
OUT
and −V
OUT
, respectively, of the
first power module. Terminals J3, J4, J5, and J6 correspond to the other two modules positive and negative
output pins. Terminal J7 connects the positive output bus to the load and J8 connects the negative output to the
load.
output pins. Terminal J7 connects the positive output bus to the load and J8 connects the negative output to the
load.
The UCC39002 load share controllers require a minimum bias voltage of 4.575 V to ensure enabling the load
share bus. Note the maximum bias voltage for this design is 15 V. This enables the under voltage lockout/bias
ok internal circuitry of the UCC39002 without exceeding the absolute maximum voltage rating of the current
sense amplifier inputs and the adust pin. Modules that have an output voltage of less than 5 V will require
external biasing for the load share controllers: jumpers JP1 through JP3 should be shorted to the EXT. position
and an external 5-V supply can be used as bias at the terminal block labeled EXTERNAL BIAS. Otherwise, the
controllers should be biased from the modules’ output bus voltage by shorting these jumpers to the INT. position.
Note that the voltage on the current sense input pins and the adjust pin must be equal to or less than the bias
voltage on VDD.
share bus. Note the maximum bias voltage for this design is 15 V. This enables the under voltage lockout/bias
ok internal circuitry of the UCC39002 without exceeding the absolute maximum voltage rating of the current
sense amplifier inputs and the adust pin. Modules that have an output voltage of less than 5 V will require
external biasing for the load share controllers: jumpers JP1 through JP3 should be shorted to the EXT. position
and an external 5-V supply can be used as bias at the terminal block labeled EXTERNAL BIAS. Otherwise, the
controllers should be biased from the modules’ output bus voltage by shorting these jumpers to the INT. position.
Note that the voltage on the current sense input pins and the adjust pin must be equal to or less than the bias
voltage on VDD.
Terminal blocks TB1 through TB3 connect to the sense lines from each module. For remote sensing, JP4 and
JP5 are left open and remote sense leads from the load are connected to the terminal block labeled REMOTE
SENSE. For local voltage sensing, simply jumper JP4 and JP5. This connects the sense lines from the modules
to the load terminals on the evaluation board through dedicated, low noise, low current traces.
JP5 are left open and remote sense leads from the load are connected to the terminal block labeled REMOTE
SENSE. For local voltage sensing, simply jumper JP4 and JP5. This connects the sense lines from the modules
to the load terminals on the evaluation board through dedicated, low noise, low current traces.