參數(shù)資料
型號(hào)： ICE3B0565J
廠商： INFINEON TECHNOLOGIES AG
英文描述： Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩
中文描述： 離線式開(kāi)關(guān)電源電流模式控制器，集成了?650V啟動(dòng)細(xì)胞/消耗的CoolMOS⑩
文件頁(yè)數(shù)： 9/26頁(yè)
文件大?。?/td> 502K
代理商： ICE3B0565J
CoolSET-F3
ICE3Bxx65J
Version 2.3
9
8 May 2006
3.4
PWM Section
Figure 6
PWM Section
3.4.1
The oscillator generates a fixed frequency with
frequency jittering of ±4% from the fixed frequency
(which is ±2.7kHz from 67kHz) at a jittering period T
FJ
.
The switching frequency is f
switch
= 67kHz.
A resistor, a capacitor and a current source and current
sink which determine the frequency are integrated. The
charging and discharging current of the implemented
oscillator capacitor are internally trimmed, in order to
achieve a very accurate switching frequency. The ratio
of controlled charge to discharge current is adjusted to
reach a maximum duty cycle limitation of D
max
=0.75.
Once the Soft Start period is over and when the IC goes
into normal mode, the Soft Start capacitor will be
charged and discharged through internal current
source, I
FJ
to generate a triangular waveform with a
jittering period T
which is externally adjustable by the
Soft Start capacitor, C
SoftS
(See Figure 4).
Oscillator and Jittering
T
FJ
= k
FJ
* C
SoftS
where k
FJ
is a constant = 4 ms/uF
eg. T
FJ
= 4 ms if C
SoftS
= 1uF
3.4.2
The oscillator clock output provides a set pulse to the
PWM-Latch when initiating the internal CoolMOS
conduction. After setting the PWM-Latch can be reset
by the PWM comparator, the Soft Start comparator or
the Current-Limit comparator. In case of resetting the
driver is shut down immediately.
PWM-Latch FF1
3.4.3
The Gate Driver is a fast totem pole gate drive which is
designed to avoid cross conduction currents.
The Gate Driver is active low at voltages below the
undervoltage lockout threshold V
VCCoff
.
Gate Driver
Figure 7
Gate Driver
Oscillator
Duty
Cycle
max
Gate Driver
0.75
Clock
&
G9
1
G8
PWM Section
FF1
R
S
Q
Gate
Soft Start
Comparator
PWM
Comparator
Current
Limiting
Frequency
Jitter
SoftS
VCC
1
PWM-Latch
Depl. CoolMOS
Gate Driver
Gate
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