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參數(shù)資料
| 型號(hào)： | TC96C555MJA |
| 廠(chǎng)商： | TelCom Semiconductor, Inc. |
| 英文描述： | 3A OUTPUT PROGRAMMABLE POWER OSCILLATOR |
| 中文描述： | 3A輸出可編程功耗振蕩器 |
| 文件頁(yè)數(shù)： | 8/9頁(yè) |
| 文件大?。?/td> | 106K |
| 代理商： | TC96C555MJA |
4-166
TELCOM SEMICONDUCTOR, INC.
TC96C555
3A OUTPUT PROGRAMMABLE
POWER OSCILLATOR
APPLICATIONS
(Cont.)
Figure 5. +5V Buck Regulator Power Supply with 82% Efficiency at 200mA Output
900
700
500
400
300
200
100
20
60 80
10
C in pF
F
Maximum Frequency
RCHG = 13K, Rdis = 6.8K
40
100
100K
10K
1K
100
10
1
0.1
100pF
.01
μ
F
.1
μ
F
10pF
C in pF
F
.001
μ
F
1
μ
F
Minimum Frequency
RCHG = 200K, Rdis = 100K
30
50
This circuit will convert a 6 to 15V input to a 5V output of
200 milliamps. Normal operating frequency is 50kHz. Peak
to peak ripple is 50 millivolts. A change from 100mA to
200mA produces a 50mV peak change in V
OUT
, with recov-
ery in 200
μ
s.
The TC96C555 is used here as a duty cycle modulator
in a buck output circuit. The source current is modulated to
control the duty cycle. Sink current is fixed at 100
μ
A with a
resistor (R4) of 10K. Transistor Q1, (2N2907A), is used for
current modulation into TC96C555 Pin 4, the charge current
program input. Shunt regulator TL431 is used for voltage
sense and regulation feedback. The TL431 has an internal
reference of 2.495V. Terminal R is compared with this
reference to control conduction of cathode C to anode A. R2
and R3 are selected to give proper bias current to the TL431.
C2 and R7 are for loop compensation and are optimized for
a recovery time of 200
μ
s. The TC96C555 outputs, Pin 7 and
6, are tied together so that when output is HIGH, current
conducts from V
DD
Pin 8 to output Pin 7 to charge the
inductor, L1. When output is OFF or LOW, energy stored in
L1 will continue to conduct through TC96C555 Pin 6 to the
lower internal MOSFET and out to Pin 5, the ground return.
This circuit does not have current limiting. A fuse is recom-
mended for protection. Figure 6 shows the duty cycle as a
function of the source current. Figure 8 shows the frequency
vs control voltage.
Figure 4. Typical Maximum and Minimum
Operating Frequency vs. Capacitor
VR1
VREF
VR2
VIN
1
3
5
TC96C555
OUT
OUT
VDD
GND
C1
470pF
2
4
C
R
A
TL431
100K
R7
C2
.1
μ
F
10K
R6
6
C3
100
μ
F
7
10K
R5
VOUT
L1, 3mH
R3, 390
+12V
C5
100
μ
F
C4
.1
μ
F
R2
560
R1
10K
Q1
2N2907A
8
R4
10K
C6
4.7
μ
F
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