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參數(shù)資料
| 型號： | UCC35705EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | UCC35705 Evaluation Module(UCC35705評估模塊) |
| 中文描述： | UCC35705評估模塊（UCC35705評估模塊） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 194K |
| 代理商： | UCC35705EVM |
SLUU141
–
March 2003
7
48-V to 3.3-V RCD Forward with UCC35705 Voltage-Mode Control and Self-Driven Synchronous Rectification
5
Test Set Up
Testing and evaluation of UCC35705EVM requires two dc voltage supplies (V
IN
and V
CC
) and an output load
(LOAD1) as shown in Figure 2. Note that the primary side ground J1 and J2 is isolated from the secondary side
ground (J3) and J3 has the opposite polarity of J1 and J2. Loop test points TP1 (V
OUT
) and TP2 (Feedback)
are connected by a 50-
resistor and allow the user to connect a network analyzer for loop response evaluation.
Figure 2. Recommended EVM Test Configuration
6
Output Load (LOAD1)
For the output load to VOUT, a programmable electonic load set to constant current mode and capable of sinking
up to 10 A
DC
is used. UCC35705EVM uses isolated grounds between input and output. V
IN
and V
CC
(J1 and
J2) are referenced to the primary side, electrically isolated from V
OUT
(J3), which is secondary side referenced.
The dc voltage meter V1 is connected directly to the output terminals (J3) to minimize voltage error from drops
between the output terminals (J3) and output load (LOAD1)
7
V
CC
dc Bias Supply (V
CC
)
UCC35705EVM is not designed with self-biasing circuitry and requires an external bias supply to provide power
to the PWM and driver circuitry. V
CC
is a variable dc voltage source capable of supplying between 0 V
DC
and
12 V
DC
at no less than 300 mA. V
CC
is connected to J2 as shown in Figure 2.
8
dc Input Source (V
IN
)
The input voltage source is a variable dc source capable of supplying between 0 V
DC
and 72 V
DC
at no less than
1.5 A
DC
, and connected to the input terminals (J1) as shown in Figure 2. For fault protection to the EVM, it is
good common practice to current limit the source to no more than 2 A
DC
. A dc ammeter (A1) inserted between
the input source (V
IN
) and input terminals (J1) ensures accurate input current readings.
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