參數(shù)資料
型號(hào)： XC910D001HASR
廠商： TOREX SEMICONDUCTOR LTD.
英文描述： PWM Controlled Step-Up DC/DC Controllers
中文描述： PWM控制升壓型DC / DC控制器
文件頁(yè)數(shù)： 11/22頁(yè)
文件大小： 1058K
代理商： XC910D001HASR
11/22
XC9101
Series
2. Oscillation Frequency
The oscillation frequency of the internal clock generator is approximated by the following equation according to the values
of the capacitor and resistor attached to the CLK pin. To stabilize the IC's operation, set the oscillation frequency within a
range of 100kHz to 600kHz. Select a value for Cclk within a range of 150pF to 220pF and fix the frequency based on the
value for Rclk.
f = 1/(-Cclk
×
Rclk
×
ln0.26)
Example: When Cclk = 220 pF and Rclk = 10 k
Ω
,
f = 1 / (-220 x 10
-12
×
10 x 10
3
×
ln(0.26)) = 337.43 kHz.
3. Gain and Frequency Characteristics of the Verr Amplifier
The gain at output and frequency characteristics of the Verr amplifier are adjusted by the values of the capacitor and
resistor attached to the CC/GAIN pin. It is generally recommended to attach a CC of 220 to 1,000pF without R
GAIN
. The
greater the CC value, the more stable the phase and the slower the transient response. When using the IC with RGAIN
connected, it should be noted that if the R
GAIN
resistance value is too high, abnormal oscillation may occur during transient
response time. The size of R
GAIN
should be carefully evaluated before connection.
4. Current Limit
The current limit value is approximated by the following equation according to resistor R
SEN
inserted between the V
IN
and
I
SEN
pins. Double function, current FB input and current limiting, is assigned to the I
SEN
pin. The current limiting value is
approximated by the following equation according to the value for R
SEN
.
ILpeak_limit = 0.15/RSEN
Example: When R
SEN
= 100 m
Ω
,
ILpeak_limit = 0.15/0.1 = 1.5 A
The inside error amplifier sends feedback signal when the voltage occurs at R
SEN
resisitors because of the flow of coil
current in order to phase compensate. The more the R
SEN
value becomes larger, the more the error signal becomes
bigger, and it could lead to an intermittent oscillation. Please be careful if there is a problem with the application. When
the regular operation, the voltage which occurs between R
SEN
resistors because of coil peak should be set lower than the
current limit voltage of 90mV (MIN.). For more details, please refer the notes on the external components.
■
OPERATIONAL EXPLANATION (Continued)
●
Functional Settings (Continued)
CLK pin
Rclk
CLK Generator
Cclk
Verr
CC/GAIN pin
RGAIN
CC
V
OUT
/FB
Vref
RVerr
Rsen
V
IN
pin
Isen pin
Limiter signal
Comparator with
150
ｍ
V offset
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