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參數(shù)資料
| 型號(hào)： | PUCC3801T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Current-mode PWM controller |
| 中文描述： | SWITCHING CONTROLLER, 100 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SOT-96, 8 PIN |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大小： | 308K |
| 代理商： | PUCC3801T |
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Philips Semiconductors
PUCC3801
Current-mode PWM controller
Product data
Rev. 01 — 10 September 2001
11 of 16
9397 750 08419
Koninklijke Philips Electronics N.V. 2001. All rights reserved.
Figure 7
shows the method of interfacing an optocoupler to the PUCC3801. The error
amplifier is overridden by holding the FB pin LOW. This causes the output of the error
amplifier to go HIGH. In this state, the amplifier sources a constant current of typically
50
μ
A into the collector of the optocoupler. The pull-up resistor to V
DD
sets the
saturation current of the optocoupler transistor.
The secondary side circuit using the TL431 adjustable precision shunt regulator, is a
widely used technique not specific to the PUCC3801. The 180
resistor biases the
TL431 in its linear region. If the output voltage rises above the regulation point, the
TL431 draws current through the optocoupler causing the voltage on COMP to fall.
As the voltage on COMP falls, the duty cycle is reduced bringing the secondary
voltage back to its set point.
11. Marking
TYPE: PUCC3801P
LOT: Diffusion lot number (5 characters)
DATE: Die revision (1 character) + Date code (yyww)
TYPE: CC3801T
LOT: Diffusion lot number (5 characters)
DATE: Die revision (1 character) + Date code (yyww)
Fig 8.
Marking PUCC3801P (SOT97-1).
Fig 9.
Marking PUCC3801T (SOT96-1).
03ag14
8
1
TYPE
LOT
DATE
LOGO
03ag15
1
8
TYPE
LOT
DATE
LOGO
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