TMC428 ETC-unknow, TMC428 Datasheet - Page 45

• Manufacturer Part Number: TMC428
• Description: Intelligent Triple Stepper Motor Controller With Serial Peripheral Interfaces
• Manufacturer: ETC-unknow

TMC428 DATA SHEET (V. 1.00 / February 12, 2001)
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
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.
TRANGEREG Temperature range
VDD5REG
CBLOCK
VDD3REG
ICCNLREG
IREG
tSREG
tSREGC
TDRFT
VRIPPLE
CREG
CREG_RAN
GE
COPTIONAL
PSRRDC
Table 28 - Characteristics of the on-chip Voltage Regulator
Copyright © 2000, TRINAMIC Microchips GmbH
TRINAMIC
M I C R O C H I P S
Symbol
VRIPPLE I_average * tCLK / C_load
Supply voltage vdd5
Block capacitor
Supply voltage vdd3
Current consumption
Output current on vdd3
Startup time
Startup time
Temperature drift
Ripple on vdd3
External capacitor
External capacitor range
Optional capacitor
power supply ripple rejection
Parameter
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
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
Conditions
Min
-40
4.5
2.9
33
1
Typ
100
100
470
470
3.3
50
50
5
Max
100
150
300
470
5.5
3.6
85
20
20
ppm / °C
Unit
mA
mV
µA
dB
°C
nF
µs
µs
nF
nF
pF
V
V
45
45