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參數(shù)資料
| 型號： | PUCC3801T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 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 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 308K |
| 代理商： | PUCC3801T |
Philips Semiconductors
PUCC3801
Current-mode PWM controller
Product data
Rev. 01 — 10 September 2001
10 of 16
9397 750 08419
Koninklijke Philips Electronics N.V. 2001. All rights reserved.
10. Application information
10.1 Off-line flyback regulator
Figure 6
shows a typical application diagram of a low-cost, off-line, flyback regulator.
The circuit uses a minimum number of external components. The PUCC3801 has an
internal voltage divider from V
DD
. When the FB pin is left open circuit, the circuit
regulates V
DD
at 12 V. Load regulation is dependent upon close coupling between the
secondary and feedback windings, and the leakage inductance of the transformer.
The circuit is designed to operate over the input voltage range 90 - 270 V (RMS). The
low start-up current of the PUCC3801 means that the dissipation in the 1 M
,
0.25 W
resistor to V
DD
does not become excessive at high input voltages. The internal slope
compensation allows stable operation at low input voltage and maximum load where
the duty cycle is greater than 50%.
10.2 Optocoupler interface
Fig 6.
Off-line flyback regulator.
1
2
3
4
5
6
7
8
COMP
FB
CSNS
REG
VDD
OUT
GND
PUCC3801
4.7
(1 W)
220
μ
F
(400 V)
AC input
80 - 270 Vrms
10
μ
F
(16 V)
4700
μ
F
(10 V)
DC output
5 V/5 A
+
1
μ
F
(10 V)
PHP1N60R
1
1 M
(0.25 W)
4 x
1N4007
BYV27-100
BYV27-100
BZD142W-68
(ZENBLOCK)
T1
Note T1:
Lp = 240
μ
H
Np : Ns = 22.3
Np : Nf = 10.0
Ns
Nf
Np
03af34
n.c.
Fig 7.
Optocoupler interface to PUCC3801.
1
2
3
4
5
6
7
8
COMP
FB
CSNS
n.c.
REG
VDD
OUT
GND
PUCC3801
12 V
100
nF
4700
μ
F
(10 V)
DC output
BYV27-100
isolated
secondary
primary side
180
4.7
k
4.7
k
4.7
k
TL431
03af35
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