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부품번호 PBD35171SO 기능
기능 Stepper Motor Drive Circuit
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PBD35171SO 데이터시트, 핀배열, 회로
February 1999
PBD 3517/1
Stepper Motor
Drive Circuit
Description
PBD 3517/1 is a bipolar, monolithic, integrated circuit, intended to drive a stepper motor
in a unipolar, bilevel way.
One PBD 3517/1 and a minimum of external components form a complete control
and drive unit for LS-TTL- or microprocessor-controlled stepper motor system for
currents up to 500mA. The driver is suited for applications requiring least-posssible RFI.
Motor performance can be increased by operating in a bilevel drive mode. This
means that a high voltage pulse is applied to the motor winding at the beginning of a
step, in order to give a rapid rise of current.
Key Features
• Complete driver and phase logic on
chip
• 2 x 350 mA continuous-output current
• Half- and full-step mode generation
• LS-TTL-compatible inputs
• Bilevel drive mode for high step rates
• Voltage-doubling drive possibilities
• Half-step position-indication output
• Minimal RFI
• 16-pin plastic DIP package or 16 pin
small outline wide body
PBD 3517/1
RC Mono
F-F
VCC
PQR
STEP
DIR
HSM
INH
OA
OB
Phase PA
Logic
PB
Figure 1. Block diagram.
VSS
LA
LB
PB2
PB1
PA2
PA1
16-pin plastic DIP
GND 16-pin SO (wide body)
1




PBD35171SO pdf, 반도체, 판매, 대치품
PBD 3517/1
Output Current [A]
10
TA= +25° C
8
6
4
2
0
0 0.2 0.4 0.6 0.8 1.0
Output Voltage [V]
Figure 7. Typical IØ vs. VØCE Sat. “Zero
output” saturation.
Output Pulse Width [s]
1
TA= +25° C
10 -1
10 -2
10 -3
Rt = 10M
Rt = 100k
Rt = 10k
10-4 Rt = 1k
10 -5
10 -6
0.01
0.1 1 10 100
Ct Capacitance [nF]
1000
Figure 8. Typical tOn vs. CT/RT. Output
pulse width vs. capacitance/resistance.
Output Pulse Width [s]
1
10 -1
100%
TA= +25° C
10 -2
10 -3
10 -4
10% 50% Dutycykle
1%
25%
10 -5
0.1%
10 -6
0.001 0.01
0.1
1
10
fs Step frequency [kHz]
100
Output Current [A]
0.5
TA= +25° C
0.4
(II = 0)
0.3
0.2
0.1
0
0 0.2 0.4 0.6 0.8 1.0
Power Dissipation [W]
Figure 9. Typical t vs. f /dc. Output pulse Figure 10. Typical P vs. I . Power
On s
DP P
width vs. step frequency/duty cycle.
dissipation without second-level supply
(includes 2 active outputs = FULL STEP).
Output Current [A]
-0.5
TA= +25° C
-0.4
10%
-0.3
50%
-0.2
-0.1
(Ip = 0)
100%
Motor Current [mA]
350
Normal
Bilevel
Bilevel without
time limit
Diagrams
How to use the diagrams:
1. What is the maximum motor current
in the application?
• The ambient temperature sets the
maximum allowable power
dissipation in the IC, which
relates to the motor currents and
the duty cycle of the bilevel
function. For PBD 3517/1, without
any measures taken to reduce
the chip temperature via
heatsinks, the power dissipation
vs. temperature follows the curve
in figure 4.
• Figures 9 and 10 give the
relationship between motor
currents and their dissipations.
The sum of these power dissipa-
tions must never exceed the
previously-established value, or
life expectancy will be drastically
shortened.
• When no bilevel or voltage
doubling is utilized, the maximum
motor current can be found
directly in figure 9.
2. How to choose timing components.
• Figure 7 shows the relationship
between CT, RT, and tOn. Care
must be taken to keep the tOn time
short, otherwise the current in the
winding will rise to a value many
times the rated current, causing
an overheated IC or motor.
3. What is the maximum tOn pulse-width
at a given frequency?
• Figure 8 shows the relationship
between duty cycle, pulse width,
and step frequency. Check
specifications for the valid
operating area.
4. Figures 4, 5 and 6 show typical
saturation voltages vs. output current
levels for different output transistors.
5. Shaded areas represent operating
conditions outside the safe operating
area.
0
0 0.2 0.4 0.6 0.8 1.0
Power Dissipation [W]
Figure 11. Typical PDI vs. II. Power
dissipation in the bilevel pulse when
raising to the II value. One active output.
4
tON Time
Figure 12 . Motor Current 1p.

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PBD35171SO 전자부품, 판매, 대치품
PBD 3517/1
Purpose of external components
For figures 14 and 15. Note that “Larger than …” is normally the vice versa of “Smaller
than … .”
Component Purpose
Value
Larger than value Smaller than value
D1, D2
Passes low power to
motor and prevents
high power from
shorting through low
power supply
If = 1A
1N4001, UF4001
Increases price
Decreases max
current capability
D3 … D6
Inductive current
supressor
If = 1A
Increases price
Decreases current
turn-off capability
trr = 100nS
e.g.
BYV27
UF4001
RGPP10G
RGPP30D
Slows down turn-
off time. Voltage
at anode might
exceed voltage
breakdown
Speeds up turn-
off time.
R1
R2, R3
R4 … R7
Base drive current
limitter
R = 20ohm
( )P = R1
Vmm 2
R1 + R2
Base discharge resistor R = 240ohm
( )P = R1
Vmm 2
R1 + R2
( )External transistor base
driver
R
=
Vmm-
Vbe- Vce
Vbe
I4 - R12
P > (I4)2• R4
Check hfe.
Slows down Q1’s Speeds up Q1’s
turn-on and Q4’s turn-on and Q4’s
turn-off time.
turn-off time.
Slows down Q1’s Speeds up Q1’s
turn-off and Q4’s turn-off and Q4’s
turn-on time.
turn-on time.
Decreases ext. Increases ext.
transistor IC max. transistor IC max.
Lowers 3517
Increases 3517
power dissipation. power dissipation.
R8, R9
ØA, ØB pull-up
resistors
R = 5ohm @ pull-up
voltage = 5V.
(VCC)2
P=
R
Increases noise
sensitivity, worse
logic-level
definition
Increases noise
immunity, better
logic-level
definition.
Less stress on ØA, Stress on ØA, ØB
ØB output
output
transistors
transistors.
R10, R11
Limit max. motor
Vmm-VMotor -VCESat
current. Resistors may R =
be omitted. (Check
IMotor max
motor specifications
first.)
Decreases motor
current.
Increases motor
current.
R12 … R15 External transistor base
Vbe
R= ª
discharge.
I12
15W
P > Vbe• I12
Slows down
Speeds up
external transistor external transistor
turn-off time.
turn-off time.
Lowers 3517
Increases 3517
power dissipation power dissipation
RT, CT
C1, C2
C3 … C5
Q1, Q2
Q3, Q4
Q5 … Q8
Sets LA and LB on time R = 47kohm, C = 10nf
when triggered by
STEP.
P < 250mW
Increases on time. Decreases on time.
Stores the doubling
voltage.
C = 100µ F
VC 45V
Increases effective
on-time during
voltage doubling
Decreases
effective on-time
during voltage
doubling.
Filtering of supply-
C 10 µF
voltage ripple and take-
up of energy feedback
from D3 … D6
Increases price,
better filtering,
decreases risk of
IC breakdown
Decreases price,
more compact
solution.
VRated>Vmm ,Vss or Vcc Increases price
Risk for capacitor
breakdown.
Activation transistor of IC as motor requires.
voltage doubling.
Increases price.
Decreases max Im
during voltage
doubling.
Charging of voltage
doubling capacitor
( )IC=
(Vmm- Vf -VCE ) • C1
1
-
fStep
0.55
RT •
CT
Motor current drive
transistor.
IC as motor requires.
PNP power trans.
Increases max
Decreases max
current capability. current capability.
INH — Inhibit
A HIGH level on the INH input,turns off all
phase outputs to reduce current
consumption.
Reset
An internal Power-On Reset circuit
connected to Vcc resets the phase logic
and inhibits the outputs during power up,
to prevent false stepping.
Output Stages
The output stage consists of four open-
collector transistors. The second high-
voltage supply contains Darlington
transistors.
Phase Outputs
The phase outputs are connected directly
to the motor as shown in figure 14.
Bilevel Technique
The bilevel pulse generator consists of
two monostables with a common RC
network.
The internal phase logic generates a
trigger pulse every time the phase
changes state. The pulse triggers its own
monostable which turns on the output
transistors for a precise period of time:
tOn = 0.55 • CT • RT.
See pulse diagrams, figures 16 through
20.
Bipolar Phase Logic Output
The ØA and ØB outputs are generated
from the phase logic and inform an
external device if the A phase or the B
phase current is internally inhibited.
These outputs are intended to support if it
is legal to correctly go from a half-step
mode to a full-step mode without loosing
positional information.
The PBD 3517/1 can act as a controller
IC for 2 driver ICs, the PBL 3770A. Use
PA1 and PB1 for phase control, and ØA and
ØB for I0 and I1 control of current turn-off.
Applications Information
Logic inputs
If any of the logic inputs are left open, the
circuit will treat it as a high-level input.
Unused inputs should be connected to
proper voltage levels in order to get the
highest noise immunity.
Phase outputs
7

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부품번호상세설명 및 기능제조사
PBD35171SO

Stepper Motor Drive Circuit

Ericsson
Ericsson

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