Texas Instruments 10-Watt Flyback Converter UCC3809EVM UCC3809EVM 데이터 시트
제품 코드
UCC3809EVM
SLUU087B
2
10-Watt Flyback Converter Using the UCC3809
1
Introduction
1.1
Design Procedure
The UCC3809EVM evaluation module is an isolated 10-W, 3.3-V converter designed for telecom input voltages,
nominally –48 Vdc but ranging from –32 Vdc to –75 Vdc. The UCC3809 economy primary-side controller is used
as the pulse-width modulator (PWM), combined with a TLV431 low-voltage adjustable-precision shunt regulator
on the secondary side. The nominal switching frequency for this converter is approximately 400 kHz. The
UCC3809 is configured with a 50% duty-cycle clamp.
nominally –48 Vdc but ranging from –32 Vdc to –75 Vdc. The UCC3809 economy primary-side controller is used
as the pulse-width modulator (PWM), combined with a TLV431 low-voltage adjustable-precision shunt regulator
on the secondary side. The nominal switching frequency for this converter is approximately 400 kHz. The
UCC3809 is configured with a 50% duty-cycle clamp.
1.2
Operating Specifications
SPECIFICATION
MIN
TYP
MAX
UNITS
Input voltage range
32
48
75
V
Output voltage range
3.218
3.3
3.383
V
Output current range
0
3.3
A
Operating frequency
344
380
420
kHz
Output ripple
100
mV
Efficiency (VIN = 48 V, IOUT = 3 A)
75
%
The circuit, shown in Figure 1, is a discontinuous fixed-frequency current-mode controlled flyback converter.
This converter contains features such as external shut down, optocoupler isolation, programmable maximum
duty cycle, and a summing node for voltage feedback, current sense, and slope compensation.
This converter contains features such as external shut down, optocoupler isolation, programmable maximum
duty cycle, and a summing node for voltage feedback, current sense, and slope compensation.
Table 1. UCC3809 10-W Flyback Converter Bill of Materials
Reference
QTY
Description
Manufacturer
Part Number
C1
1
Ceramic, 39 pF,
±
5%, 50 V, NPO, 0603
Panasonic
ECJ–1VC1H390J
C2
1
Ceramic, 1.0
µ
F, +80%/–20%, 50 V, Y5V, 0805
Taiyo Yuden
UMK212F105ZG
C3
1
Ceramic, 10 nF,
±
10%, 50 V, X7R, 0603
Panasonic
ECU–V1H103KBV
C4
1
Ceramic, 0.47
µ
F, +80%/–20%, 16 V, Y5V, 0603
Panasonic
ECJ–1VF1C474Z
C5
1
Ceramic, 10
µ
F,
±
10%, 35 V, Y5V, 1210
Taiyo Yuden
GMK325F106ZH
C6
1
Ceramic, 4.7 nF,
±
10%, 50 V, X7R, 0603
Panasonic
ECU–V1H472KBV
C7
1
Ceramic, 120 pF,
±
5%, 50 V, NPO, 0603
Panasonic
ECJ–1VC1H121J
Capacitor
C8
1
Ceramic, 1.5 nF,
±
10%, 50 V, X7R, 0603
Panasonic
ECU–V1H152KBV
Capacitor
C9
1
Ceramic, 150 pF,
±
5%, 50 V, NPO, 0603
Panasonic
ECU–V1H151JCV
C10, C11, C12
3
Tantalum, 470
µ
F,
±
10%, 6.3 V, 7343H
Kemet
T510X477K006AS *
C13
1
Ceramic, 47 pF,
±
5%, 50 V, NPO, 0603
Panasonic
ECJ–1VC1H470J
C14
1
Ceramic, 10
µ
F,
±
10%, 6.3 V, X5R, 1206
Taiyo Yuden
JMK316BJ106ML
C15
1
Ceramic, 0.1
µ
F, +80%/–20%, 16V, Y5V, 0603
Panasonic
ECJ–1VF1C104Z
C16, C17
2
Ceramic, 220 pF,
±
5%, 50 V, NPO, 0603
Panasonic
ECU–V1H221JCV
C18
1
Ceramic, 1
µ
F,
±
10%, 100 V, X7R, 2225
Kemet
C2225C105K1RAC *
C19
1
Ceramic, 1
µ
F,
±
10%, 16 V, X7R, 1206
Panasonic
ECJ–3YB1C105K
NOTE: * Equivalent substitution not recommended