參數(shù)資料
型號(hào)： UCD9240PHR
廠商： Texas Instruments, Inc.
英文描述： UCD9240 Digital Point of Load System Controller
中文描述： UCD9240系列數(shù)字點(diǎn)系統(tǒng)控制器的負(fù)荷
文件頁(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 572K
代理商： UCD9240PHR
UCD9240
Digital Point of Load System Controller
SLUS766
– APRIL 2007
www.ti.com
17
Figure 4 Temperature Mux (4-rail, 6-phase example)
Current Measurement
Pins CS1-A, CS1-B, CS2-A, CS2-B, CS3-A, CS3-B, CS4-A, and CS4-B are used to measure output or inductor
current in each of the controlled power stages. MFR_SPECIFIC PMBus commands are used to calibrate each
measurement. When the measured current exceeds either the over-current or undercurrent threshold a FAULT is
declared the UCD9240 performs the PMBus programmed fault recovery. ADC current measurements are digitally
filtered (averaged) before compared against the FAULT threshold.
In response to a PMBus request for a current reading, the device will return an average current value. When the
UCD9240 is configured to drive a multi-phase power converter, the device will add the average current
measurement for each of the power stages tied to a power rail.
Current Sense Detection
Several mechanisms are provide to sense output current. This allows for the design of power systems with
multiple layers of protection.
1. A logic high signal on the FAULT input will immediately drive the PWM signal for the associated page
(rail/output) low. The SRE signal will be driven low between TDB and TBD usec later. An intelligent gate
driver such as the UCD7230 can be used to generate the FAULT signal. The UCD7230 monitors the voltage
drop across the high side FET and if it exceeds a resistor programmed threshold, the UCD7230 activates the
CLF output and turns off the FET drives. The CLF can be used to drive the FAULT input on the UCD9240.
Typically, the FAULT input is used to monitor and protect against a short circuit in one of the switches or the
load. Therefore this threshold is set to the highest current setting of the multiple over-current settings.
2. Four of the current sense inputs are wired to an internal analog comparator, one for each page (rail/output).
The threshold for the current sense input is set to 2.0V. This input can be used to detect the output of a
current sense amplifier such as the amplifier in the UCD7230 which monitors the current in the power stage
inductor. If the current sense voltage exceeds 2.0V the corresponding PWM output is immediately driven low.
The SRE signal will be driven low between TDB and TBD usec later. The over-current threshold condition is
programmed by choosing the appropriate divider network on the input to the CSx.y pin. This forms the
"middle" level of over-current protection.
3. Each Current Sense input to the UCD9240 is also monitored by the 12-bit ADC. This measured value is
averaged and compared with a PMBus programmable threshold. This threshold is typically the lowest over-
current setting and set closest to the maximum allowed current for the design.
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