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參數(shù)資料
| 型號(hào)： | TMC428 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Intelligent Triple Stepper Motor Controller with Serial Peripheral Interfaces |
| 中文描述： | 三步進(jìn)電機(jī)智能控制器的串行外圍接口 |
| 文件頁數(shù)： | 45/50頁 |
| 文件大?。?/td> | 378K |
| 代理商： | TMC428 |
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TMC428 DATA SHEET (V. 1.00 / February 12, 2001)
45
Copyright 2000, TRINAMIC Microchips GmbH
M I C R O C H I P S
45
On-Chip Voltage Regulator
The on-chip voltage regulator delivers a 3.3V supply for the core under a 30 mA load with a 4.5 minimum
input voltage. An external 470 nF ceramic capacitor has to be connected between the V33 pin (see Figure
19, page 42) and ground, with connections as short as possible. The regulator is internally stable. The
output capacitor is only needed for power supply filtering, not for feedback loop stabilization. The ripple
voltage VRIPPLE on pin V33 is approximately
VRIPPLE
≈
I_average * tCLK / C_load
where I_average is the average current, tCLK is the clock period, C_load is capacity of the capacitor. A
capacity between 33 nF to 470 nF (perhaps 100 nF) are sufficient, depending on the ripple requirements.
The technology is more important: x7r ceramic capacitors shall be preferred, in parallel with 470 pF to 1
pF c0g. Tantalum capacitors should be avoided, because of their poor high frequency behavior.
Additionally, an external 100 nF ceramic capacitor (CBLOCK) has to be connected between pin V5 and
ground– with connections as short as possible –in 5V operational mode. In 3.3V operational mode an
external 100 nF ceramic capacitor (see Figure 19) is necessary only between pin V33 and ground, with
connections as short as possible.
Symbol
TRANGEREG
Temperature range
VDD5REG
Supply voltage vdd5
CBLOCK
Block capacitor
VDD3REG
Supply voltage vdd3
ICCNLREG
Current consumption
IREG
Output current on vdd3
tSREG
Startup time
tSREGC
Startup time
TDRFT
Temperature drift
VRIPPLE
Ripple on vdd3
CREG
External capacitor
CREG_RAN
GE
COPTIONAL
Optional capacitor
PSRRDC
power supply ripple rejection
Parameter
Conditions
Min
-40
4.5
Typ
Max
85
5.5
Unit
°C
V
nF
V
μA
mA
μs
μs
ppm / °C
mV
nF
nF
Industrial
5 V Operational Mode
5 V Operational Mode, x7r ceramic capacitor
3.3 V Operational Mode
no load
max. 10 mA internal load by core
no external capacitor connected
C_load = 470 nF
5
100
3.3
50
2.9
3.6
100
20
20
150
300
C_load = 470 nF, I_load = 10mA + 20 mA
On V33 pin, x7r ceramic
On V33 pin, x7r ceramic, necessary capacity
depending on required VRIPPLE
Additional Parallel Capacitor, c0g ceramic
DC
100
470
470
External capacitor range
33
1
470
pF
dB
50
Table 28 - Characteristics of the on-chip Voltage Regulator
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