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參數(shù)資料
| 型號： | UCC2813- |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Low Power Economy BiCMOS Current Mode PWM |
| 中文描述： | 低功耗經(jīng)濟的BiCMOS電流模式PWM |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 404K |
| 代理商： | UCC2813- |
SGLS245 MAY 2004
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed descriptions (continued)
RC
RC is the oscillator timing pin. For fixed frequency operation, set timing capacitor charging current by connecting
a resistor from REF to RC. Set frequency by connecting timing capacitor from RC to GND. For best perfomance,
keep the timing capacitor lead to GND as short and direct as possible. If possible, use separate ground traces
for the timing capacitor and all other functions.
The frequency of oscillation can be estimated with the following equations:
UCC28130 1 2 4 : F
1.5
R
C
UCC28133 UCC28135 : F
1.0
R
C
where frequency is in Hz, resistance is in ohms, and capacitance is in farads. The recommended range of the
timing resistors is between 10 k
and 200 k
and the timing capacitor is 100 pF to 1000 pF. Never use a timing
resistor less than 10 k.
To prevent noise problems, bypass V
CC
to GND with a ceramic capacitor as close to the V
CC
pin as possible.
An electrolytic capacitor may also be used in addition to the ceramic capacitor.
voltage reference (REF)
REF is the voltage reference for the error amplifier and also for many other functions on the IC. REF is also used
as the logic power supply for high-speed switching logic on the IC.
When V
CC
is greater than 1 V and less than the UVLO threshold, REF is pulled to ground through a 5-k
resistor.
This means that REF can be used as a logic output indicating power system status. It is important for reference
stability that REF is bypassed to GND with a ceramic capacitor as close to the pin as possible. An electrolytic
capacitor may also be used in addition to the ceramic capacitor. A minimum of 0.1-
μ
F ceramic capacitor is
required. Additional REF bypassing is required for external loads greater than 2.5 mA on the reference.
To prevent noise problems with high-speed switching transients, bypass REF to ground with a ceramic capacitor
close to the IC package.
power (V
CC
)
V
CC
is the power input connection for this device. In normal operation, V
CC
is powered through a current limiting
resistor. Although quiescent V
CC
current is low, total supply current will be higher, depending on OUT current.
Total V
CC
current is the sum of quiescent V
CC
current and the average OUT current. Knowing the operating
frequency and the MOSFET gate charge (Q
g
), average OUT current can be calculated from:
I
OUT
Q
g
F.
(1)
(2)
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