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參數(shù)資料
| 型號： | Q67000-A9284-X201-K5 |
| 廠商： | SIEMENS AG |
| 英文描述： | High Performance Power Combi Controller |
| 中文描述： | 高性能功率Combi機控制器 |
| 文件頁數(shù)： | 13/39頁 |
| 文件大?。?/td> | 472K |
| 代理商： | Q67000-A9284-X201-K5 |
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TDA 16888
Semiconductor Group
13
Data Sheet 1998-05-06
Comparator C1
The comparator C1 serves to adjust the duty cycle of the PFC gate drive. This is
achieved by comparison of the output voltage of OP2 given at pin 3 (PFC CC) and the
voltage ramp of the oscillator.
Comparator C2
The comparator C2 serves to prevent the external circuitry from destruction by
immediately switching the PFC output PFC OUT (pin 8) off, if the voltage at pin 19
(PFC VS) drops below 1 V due to a broken wire.
Comparator C3
By means of this extremely fast comparator sensing at pin 6 (PFC CL) peak current
limitation is realized. When being activated (
V
PFC CL
< 1 V) it will immediately shut down
the gate drive of the PFC section (pin 8, PFC OUT). In order to protect C3 against
undervoltages at pin 6 (PFC CL) due to large inrush currents, this pin is equipped with
an additional clamping diode D4.
Comparator C4
This comparator along with the TDA 16888’s power management serves to reset the
PWM section’s soft start at pin 13 (PWM SS). C4 becomes active as soon as an
undervoltage (
V
PFC VS
< 4 V) of the PFC output voltage is sensed at pin 19 (PFC VS).
Comparator C5
Based on the status of the PWM section’s soft start at pin 13 (PWM SS), the comparator
C5 controls the bias of the entire PWM section. In this way the PWM section is switched
off giving a very low quiescent current, until its soft start is released.
Comparator C6
Overvoltage protection of the PWM section’s input voltage sensed at pin 19 (PFC VS) is
realized by comparator C6, which when being activated will immediately shut down both
gate drives PFC OUT (pin 8) and PWM OUT (pin 10).
Comparator C7
This comparator sensing at pin 13 (PWM SS) and at pin 15 (PWM RMP) controls the
pulse width modulation of the PWM section during the soft start. This is done right after
the PWM section is biased by comparator C5.
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