ENA0967 [SANYO]
Bi-CMOS LSI PWM Constant-Current Control Stepping Motor Driver and Switching Regulator Controller; BI -CMOS大规模集成电路的PWM恒流控制步进电机驱动器和开关稳压器控制器
| 型号： | ENA0967 |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Bi-CMOS LSI PWM Constant-Current Control Stepping Motor Driver and Switching Regulator Controller |
| 文件： | 总21页 (文件大小：228K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : ENA0967
Bi-CMOS LSI
PWM Constant-Current Control Stepping Motor
Driver and Switching Regulator Controller
LV8747T
Overview
The LV8747T is a PWM constant-current control stepping motor driver and switching regulator controller IC.
Features
• Two circuits of PWM constant-current control stepping motor driver incorporated
• Two circuits of switching regulator controller incorporated
• Motor driver control power incorporated
• Control of the stepping motor to W1-2 phase excitation possible
• Chopping frequency selectable
• Output short-circuit protection circuit incorporated
• High-precision reference voltage circuit incorporated
• Output-stage push-pull composition enabling high-speed operation
• Timer latch type short-circuit protection circuit incorporated
• Upper and lower regenerative diodes incorporated
• Thermal shutdown circuit incorporated
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Supply voltage
Symbol
Conditions
Ratings
Unit
V
VM max
38
1.75
1.5
Driver output peak current 1
Driver output continuous current 1
Driver output peak current 2
Driver output continuous current 2
Regulator output current
MDI peak1
O
OUT1/OUT2 tw ≤ 10ms, duty 20%
OUT1/OUT2
A
MDI max1
O
A
MDI peak2
O
OUT3/OUT4 tw ≤ 10ms, duty 20%
OUT3/OUT4
0.8
A
MDI max2
O
0.5
A
SWI max
O
OUT5/OUT6 tw ≤ 1µs
500
mA
Continued on next page.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer
's products or
equipment.
O1007 MS PC 20071001-S00003 No.A0967-1/21
LV8747T
Continued from preceding page.
Parameter
Symbol
Pd max1
Pd max2
Topr
Conditions
Ratings
Unit
W
Allowable power dissipation 1
Allowable power dissipation 2
Operating temperature
Independent IC
Our recommended four-layer substrate *1, *2
0.4
4.85
W
-20 to +85
-55 to +150
°C
°C
Storage temperature
Tstg
*1 Specified circuit board : 100×100×1.6mm3 : 4-layer glass epoxy printed circuit board
*2 For mounting to the backside by soldering, see the precautions.
Allowable Operating Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Supply voltage
VM
10 to 35
0 to 5
Logic input voltage
V
V
IN
VREF input voltage
Regulator output voltage
Regulator output current
Error amplifier input voltage
Timing capacity
VREF
0 to 3
V
V
VM-5 to VM
0 to 200
0 to 3
V
O
I
mA
V
O
V
A
O
CT
RT
100 to 15000
5 to 50
pF
kΩ
kHz
Timing resistance
Triangular wave oscillation
frequency
F
10 to 800
OSC
Electrical Characteristics at Ta = 25°C, VM = 24V, VREF = 1.5V
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
General
VM current drain
IM
PS = “H”, no load
6
8
mA
°C
°C
V
Thermal shutdown temperature
Thermal hysteresis width
REG5 output voltage
Motor Drivers [Charge pump block]
Boost voltage
TSD
Design guarantee
Design guarantee
Ireg5 = -1mA
180
40
∆TSD
Vreg5
4.5
5.0
5.5
VGH
tONG
Fcp
VM = 24V
28.0
90
28.7
50
29.8
100
150
V
Rise time
VG = 10µF
CHOP = 20kΩ
ms
kHz
Oscillation frequency
Output block (OUT1/OUT2)
Output on resistance
120
RonU1
RonD2
I
I
= -1.5A, source side
= 1.5A, sink side
= 35V
0.5
0.5
0.8
0.8
50
Ω
Ω
O
O
Output leak current
I
leak1
V
µA
V
O
O
Diode forward voltage
Output block (OUT3/OUT4)
Output on resistance
VD1
ID = -1.5A
1.0
1.3
RonU2
RonD2
I
I
= -500mA, source side
1.5
1.1
1.8
1.4
50
Ω
Ω
O
O
= 500mA, sink side
= 35V
Output leak current
Diode forward voltage
Logic input block
Logic pin input current
I
leak2
V
µA
V
O
O
VD2
ID = -500mA
1.0
1.3
I
L
V
V
= 0.8V
= 5V
3
30
8
15
70
µA
µA
V
IN
IN
I
H
50
IN
IN
Logic high-level input voltage
Logic low-level input voltage
Current control block
VREF input current
V
H
2.0
IN
V
L
0.8
V
IN
IREF
Fchop
VHH
VLH
VREF = 1.5V
-0.5
45
µA
kHz
V
Chopping frequency
CHOP = 20kΩ
62.5
0.300
0.200
0.100
75
0.309
0.209
0.107
Threshold voltage of current setting
comparator
VREF = 1.5V, I0 = H, I1 = H
VREF = 1.5V, I0 = L, I1 = H
VREF = 1.5V, I0 = H, I1 = L
0.291
0.191
0.093
V
VHL
V
Continued on next page.
No.A0695-2/21
LV8747T
Continued from preceding page.
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
Output short-circuit protection circuit
Charge current
IOCP
VOCP = 0V
15
20
25
µA
Threshold voltage
VthOCP
0.8
1.0
1.2
V
Switching regulator Controller [Reference voltage block]
REG25 output voltage
Input stability
Vreg25
Ireg25 = -1mA
2.475
2.500
2.525
10
V
V
I
VM = 10 to 35V
mV
mV
DL
Load stability
V
O
Ireg25 = 0 to -3mA
10
DL
Internal regulator block
REGVM5 output voltage
Triangular wave oscillator block
Oscillation frequency
Frequency fluctuation
Current setting pin voltage
Protective circuit block
Threshold voltage of comparator
Standby voltage
VregVM5
VregVM5 = 1mA
VM-6.0
72
VM-5.0
V
FOSC
FDV
RT = 20kΩ, CT = 620pF
VM = 10 to 35V
RT = 20kΩ
80
1
88
5
kHz
%
VRT
0.91
1.40
0.98
1.05
V
VthFB
VstSCP
ISCP
FB5, FB6
1.55
1.70
100
3.4
V
ISCP = 40µA
VSCP = 0V
mV
µA
V
Source current
1.6
2.5
1.8
Threshold voltage
VthSCP
VltSCP
1.65
1.95
100
Latch voltage
ISCP = 40µA
mV
Soft start circuit block
Source current
ISOFT
VSOFT = 0V
1.3
1.6
1.9
µA
Latch voltage
VltSOFT
ISOFT = 40µA
100
mV
Low-input malfunction preventive circuit block
Threshold voltage
VUT
8.3
8.7
9.1
V
Hysteresis voltage
VHIS
240
340
440
mV
Error amplifier block
Input offset voltage
V O
i
6
30
mV
nA
nA
dB
V
Input offset current
I O
i
Input bias current
I b
i
100
OPEN open gain
AV
85
Common-phase input voltage range
Common phase removal ratio
Max output voltage
VCM
VM = 10 to 35V
3.0
CMRR
80
5.0
0.2
600
75
dB
V
V
H
L
4.5
O
Min output voltage
V
0.5
1000
105
V
O
Output sink current
Isi
FB = 2.5V
FB = 2.5V
300
45
µA
µA
Output source current
PWM comparator block
Iso
Input threshold voltage
(Fosc = 10kHz)
VT100
VT0
Duty cycle = 100%
Duty cycle = 0%
DT6 = 0.4V
0.95
0.49
1.01
0.52
1.07
0.55
1
V
V
Input bias current
IBDT
Don1
µA
%
MAX duty cycle 1
(Fosc = 80kHz)
MAX duty cycle 2
(Fosc = 160kHz)
MAX duty cycle 3
(Fosc = 10kHz)
Output block
5ch
Internally fixed
95
93
56
Don2
Don3
5ch
Internally fixed
%
%
6ch
65
74
VREG25 divided by 17kΩ and 8kΩ
Output ON resistance
RonU3
RonD3
ILEAK
I
I
= -200mA, source side
= 200mA, sink side
= 35V
10
6
12
8
Ω
Ω
O
O
Leak current
V
5
µA
O
No.A0695-3/21
LV8747T
Package Dimensions
unit : mm (typ)
3337
TOP VIEW
SIDE VIEW
BOTTOM VIEW
9.0
7.0
(4.4)
64
1
2
0.125
0.4
0.16
(0.5)
SIDE VIEW
SANYO : TQFP64K(7X7)
No.A0695-4/21
LV8747T
Pd max – Ta
6.0
*1 With Exposed Die-Pad substrate
*2 Without Exposed Die-Pad
Four-layer substrate *1
4.85
4.0
Four-layer substrate *2
2.52
1.25
2.40
2.0
0
–
20
0
20
40
60
80
100
Ambient temperature, Ta – °C
Substrate Specifications (Substrate recommended for operation of LV8747T)
Size
Material
: 100mm × 100mm × 1.6mm (four-layer substrate [2S2P])
: Glass epoxy
Copper wiring density : L1 = 85% / L4 = 90%
L1 : Copper wiring pattern diagram
L4 : Copper wiring pattern diagram
Cautions
1) The data for the case with the Exposed Die-Pad substrate mounted shows the values when 80% or more of the
Exposed Die-Pad is wet.
2) For the set design, employ the derating design with sufficient margin.
Stresses to be derated include the voltage, current, junction temperature, power loss, and mechanical stresses such as
vibration, impact, and tension.
Accordingly, the design must ensure these stresses to be as low or small as possible.
The guideline for ordinary derating is shown below :
(1)Maximum value 80% or less for the voltage rating
(2)Maximum value 80% or less for the current rating
(3)Maximum value 80% or less for the temperature rating
3) After the set design, be sure to verify the design with the actual product.
Confirm the solder joint state and verify also the reliability of solder joint for the Exposed Die-Pad, etc.
Any void or deterioration, if observed in the solder joint of these parts, causes deteriorated thermal conduction,
possibly resulting in thermal destruction of IC.
No.A0695-5/21
LV8747T
Pin Assignment
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1
2
3
4
5
6
7
8
9
GND
DT6 48
RT 47
PHA4
OUT4B
RNF4
CT 46
REG25 45
REG5 44
SCP 43
SOFT 42
VMSW 41
VREF12 40
CHOP 39
CP1 38
OUT4A
VM34
OUT3B
RNF3
OUT3A
10 PGND3
11 I03
Top View
12 I13
CP2 37
13 PHA3
14 I02
VG 36
I01 35
15 I12
I11 34
16 PHA2
PHA1 33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
No.A0695-6/21
LV8747T
Block Diagram
O u t p u t p r e a m p l i f i e r s t a g e
O u t p u t p r e a m p l i f i e r s t a g e
O u t p u t p r e a m p l i f i e r s t a g e
O u t p u t p r e a m p l i f i e r s t a g e
O u t p u t p r e a m p l i f i e r s t a g e
O u t p u t p r e a m p l i f i e r s t a g e
O u t p u t p r e a m p l i f i e r s t a g e
O u t p u t p r e a m p l i f i e r s t a g e
No.A0695-7/21
LV8747T
Pin Functions
Pin No
Pin
Description
24
25
30
31
26
27
28
29
22
23
18
19
20
21
35
34
33
14
15
16
40
32
17
6
VM12
Driver 1/2ch Pin to connect to power supply
Driver 1ch OUTA output pin
OUT1A
OUT1B
RNF1
Driver 1ch OUTB output pin
Driver 1ch Current sense resistor connection pin
Driver 2ch OUTA output pin
OUT2A
OUT2B
RNF2
Driver 2ch OUTB output pin
Driver 2ch Current sense resistor connection pin
Driver 1ch Output current setting input pin
I01
I11
PHA1
I02
Driver 1ch Output phase shift input pin
Driver 2ch Output current setting input pin
I12
PHA2
VREF12
PGND1
PGND2
VM34
OUT3A
OUT3B
RNF3
OUT4A
OUT4B
RNF4
I03
Driver 2ch Output phase shift input pin
Driver 1/2ch Output current setting reference voltage input pin
Driver output Power GND
Driver output Power GND
Driver 3/4ch Power connection pin
Driver 3ch OUTA output pin
9
7
Driver 3ch OUTB output pin
8
Driver 3ch Current sense resistor connection pin
Driver 4ch OUTA output pin
5
3
Driver 4ch OUTB output pin
4
Driver 4ch Current sense resistor connection pin
Driver 3ch Output current setting input pin
11
12
13
63
64
2
I13
PHA3
I04
Driver 3ch Output phase shift input pin
Driver 4ch Output current setting input pin
I14
PHA4
VREF34
PGND3
OCP
Driver 4ch Output phase shift input pin
Driver 3/4ch Output current setting reference voltage input pin
Driver output Power GND
61
10
60
59
39
62
36
38
37
41
44
56
45
46
47
42
43
54
Pin to connect to the output short-circuit state detection time setting capacitor
Over-current mode changeover pin
OCPM
CHOP
PS
Pin to connect to the resistor to set the chopping frequency
Driver Power save input pin
VG
Charge pump capacitor connection pin
Charge pump capacitor connection pin
Charge pump capacitor connection pin
Power connection pin
CP1
CP2
VMSW
REG5
REGVM5
REG25
CT
Internal regulator output pin
Internal regulator output pin
Regulator Reference voltage output pin
Regulator Timing capacity external pin
Regulator Timing resistor external pin
Regulator Soft start setting pin
RT
SOFT
SCP
Regulator Timer and latch setting pin
Regulator Error amplifier 5 input + pin
NON5
Continued on next page.
No.A0695-8/21
LV8747T
Continued from preceding page.
Pin No
53
Pin
Description
INV5
FB5
Regulator Error amplifier 5 input – pin
52
Regulator Error amplifier 5 output pin
Regulator Output 5
58
OUT5
NON6
INV6
FB6
51
Regulator Error amplifier 6 input + pin
Regulator Error amplifier 6 input – pin
Regulator Error amplifier 6 output pin
Regulator Output 6
50
49
57
OUT6
DT6
48
Regulator Output 6 MAX DUTY setting pin
GROUND
55
GND
GND
1
GROUND
No.A0695-9/21
LV8747T
Equivalent Circuits
Pin No.
Pin Name
Equivalent Circuit
2
PHA4
I03
REG5
11
12
13
14
15
16
33
34
35
59
62
63
64
I13
PHA3
I02
I12
PHA2
PHA1
I11
10kΩ
I01
100kΩ
OCPM
PS
I04
I14
GND
36
37
38
VG
CP2
CP1
VMSW
38
37
36
100Ω
REG5
GND
3
4
OUT4B
RNF4
6
5
OUT4A
VM34
6
REG5
7
OUT3B
RNF3
8
9
OUT3A
PGND3
5
9
3 7
10
500Ω
4
8
GND
10
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
PGND2
OUT2B
OUT2B
RNF2
24
25
RNF2
REG5
OUT2A
OUT2A
VM12
22 23
30 31
18 19
26 27
VM12
OUT1B
OUT1B
RNF1
500Ω
RNF1
OUT1A
OUT1A
PGND1
20 28
21 29
GND
17 32
Continued on next page.
No.A0695-10/21
LV8747T
Continued from preceding page.
Pin No.
Pin Name
Equivalent Circuit
40
61
VREF12
VREF34
REG5
500Ω
GND
REG5
39
CHOP
1kΩ
GND
60
OCP
REG5
500Ω
GND
44
REG5
VMSW
2kΩ
26kΩ
GND
45
REG25
REG5
VMSW
5kΩ
GND
Continued on next page.
No.A0695-11/21
LV8747T
Continued from preceding page.
Pin No.
Pin Name
Equivalent Circuit
49
50
51
52
53
54
FB6
INV6
NON6
FB5
REG5
VMSW
VMSW
2kΩ
INV5
NON5
500Ω
500Ω
2kΩ
50 53
GND
VMSW
51
54
49
52
48
DT6
REG5
VMSW
500Ω
GND
46
47
CT
RT
REG5
500Ω
500Ω
500Ω
GND
VMSW
46
47
57
58
OUT6
OUT5
VMSW
REGVM5
Continued on next page.
No.A0695-12/21
LV8747T
Continued from preceding page.
Pin No.
56
Pin Name
REGVM5
Equivalent Circuit
VMSW
150KΩ
65KΩ
GND
42
SOFT
REG5
500Ω
500Ω
GND
VMSW
43
SCP
REG5
500Ω
GND
VMSW
No.A0695-13/21
LV8747T
Stepping Motor Driver OUT1/OUT2(OUT3/OUT4)
(1) Output control logic
Parallel input (Note)
Output
Current direction
PS
PHA
*
OUTA
Off
OUTB
Off
Low
High
High
Standby
Low
High
Low
High
High
Low
OUTB→OUTA
OUTA→OUTB
(Note) : Enter either “H” or “L” externally for the logic input pin. Never use the input pin in the OPEN state.
(2) Constant-current setting
I0 (Note)
I1 (Note)
Output current
High
High
I
I
I
I
= (VREF/5) /RNF
= ((VREF/5) /RNF) × 2/3
= ((VREF/5) /RNF) × 1/3
= 0
O
O
O
O
Low
High
High
Low
Low
Low
(Note) : Enter either “H” or “L” externally for the logic input pin. Never use the input pin in the OPEN state.
Set current calculation method
The constant-current control setting of STM driver is determined as follows from the setting of VREF voltage, and I0
and I1, and resistor (RNF) connected between RNF and GND :
Iconst [A] = ((VREF [V] /5) /RNF [Ω]) × attenuation factor
(Example) For VREF = 1.5V, I0 = I1 = “H” and RNF = 1Ω ;
Iconst = 1.5V/5/1Ω × 1 = 0.3A
(3) Setting the chopping frequency
For constant-current control, chopping operation is made with the frequency determined by the external resistor
(connected to the CHOP pin).
The chopping frequency to be set with the resistance connected to the CHOP pin (pin 39) is as shown below.
Chopping frequency
140
120
100
80
60
40
20
0
0
10
20
30
40
50
60
70
80
CHOP resistance (kΩ)
The recommended chopping frequency ranges from 30kHz to 120kHz.
No.A0695-14/21
LV8747T
(4) Constant-current control time chart (chopping operation)
(Sine wave increasing direction)
STEP
Set current
Set current
Coil current
Forced CHARGE
section
fchop
Current mode CHARGE
SLOW
FAST
CHARGE
SLOW FAST
(Sine wave decreasing direction)
STEP
Set current
Coil current
Forced CHARGE
section
Set current
fchop
Current mode CHARGE
SLOW
FAST
Forced CHARGE FAST
section
CHARGE
SLOW
In each current mode, the operation sequence is as described below :
• At rise of chopping frequency, the CHARGTE mode begins.(The section in which the CHARGE mode is forced
regardless of the magnitude of the coil current (ICOIL) and set current (IREF) exists for 1/16 of one chopping cycle.)
• The coil current (ICOIL) and set current (IREF) are compared in this forced CHARGE section.
When (ICOIL<IREF) state exists in the forced CHARGE section ;
CHARGE mode up to ICOIL ≥ IREF, then followed by changeover to the SLOW DECAY mode, and finally
by the FAST DECAY mode for the 1/16 portion of one chopping cycle.
When (ICOIL<IREF) state does not exist in the forced CHARGE section;
The FAST DECAY mode begins. The coil current is attenuated in the FAST DECAY mode till one cycle of
chopping is over.
Above operations are repeated. Normally, the SLOW (+FAST) DECAY mode continues in the sine wave increasing
direction, then entering the FAST DECAY mode till the current is attenuated to the set level and followed by the SLOW
DECAY mode.
No.A0695-15/21
LV8747T
(5) Output current vector locus (one step is normalized to 90 degrees)
2-phase commutation position
100.0
66.7
33.3
0.0
0.0
33.3
66.7
100.0
Channel 2 phase current ratio
(6) Typical current waveform in each excitation mode
Two-phase excitation (1/2ch, CW mode)
I01,I11
H
H
PHA1
I02,I12
PHA2
(%) 100
I 1
OUT
0
-100
(%) 100
I 2
OUT
0
-100
No.A0695-16/21
LV8747T
1-2 phase excitation (1/2ch, CW mode)
I01
I11
PHA1
I02
I12
PHA2
(%)
100
I
1
OUT
0
-100
(%)
100
0
I
2
OUT
-100
PCA01195
W1-2 phase excitation (1/2ch, CW mode)
I01
I11
PHA1
I02
I12
PHA2
(%)
100
I
1
OUT
0
-100
(%)
100
0
I
2
OUT
-100
PCA01196
No.A0695-17/21
LV8747T
Output short-circuit protection circuit
To protect IC from damage due to short-circuit of the output caused by lightening or ground fault, the output short-circuit
protection circuit to put the output in the standby mode is incorporated.
(1) Output short-circuit protection operation changeover function
Changeover to the output short-circuit protection of IC is made by the setting of OCPM pin.
OCPM
“Low”
“High”
State
Auto reset method
Latch method
(Auto reset method)
When the output current is below the output short-circuit protection current, the output is controlled by the input signal.
When the output current exceeds the detection current, the switching waveform as shown below appears instead.
Exceeding the
over-current
detection
current
ON
OFF
ON
OFF
ON
Output current
1V
OCP voltage
0.5 to 1µs
256µs (TYP)
When detecting the output short-circuit state, the short-circuit detection circuit is activated.
When the short-circuit detection circuit operation exceeds the timer latch time described later, the output is changed
over to the standby mode and reset to the ON mode again in 256µs (TYP). In this event, if the over-current mode still
continues, the above switching mode is repeated till the over-current mode is canceled.
(Latch method)
Similarly to the case of automatic reset method, the short-circuit detection circuit is activated when it detects the
output short-circuit state.
When the short-circuit detection circuit operation exceeds the timer latch time described later, the output is changed
over to the standby mode.
In this method, latch is released by setting PS = “L”
(2) OCP pin constant setting method (timer latch setting)
Connect C between the OCP pin and GND, and the time up to the output OFF can be set in case of output short-circuit.
The C value can be determined as follows :
Timer latch : Tocp
Tocp ≈ C × V/I [s]
V : Threshold voltage TYP 1V
I : OCP charge current TYP 20µA
(C: Recommended constant value 100pF to 200pF)
No.A0695-18/21
LV8747T
Switching Regulator Controller
(1) Regulator block diagram
MAXDUTY setting pin
5ch internally fixed
REG5
VMSW
DT
CT
RT
VM
1.0V
Triangle
wave
Internal
reference
voltage
5V
REG25
2.5V
reference
voltage
0.5V
2.5V
5V
Triangle wave
oscillator
5V
Constant
Current
Error amplifier
5V
PWM comparator
1.6µA
5V
+
-
-
NON
FB
OUT
+
-
FB comparator
+
High during
LVS
operation
5V
5V
5V
LVS
5V
-
Constant
1.55V
+
High during
protection
circuit
+
-
Current
REGOUT
operation
Short-circuit
2.5µA
protection circuit
VM
Internal
reference
voltage
VM-5V
SCP REGVM5
SOFT INV
Soft start setting pin
Timer/latch setting pin
(2) Timing chart
Short-circuit protection comparator
reference voltage
Oscillator triangular wave output (CT)
Max_Duty setting voltage (DT)
Error amplifier output (FB)
1.55V
1.0V
0.5V
Output (OUT)
Triangular wave conversion output
(1) (2)
1.8V
SCP pin waveform
Short-circuit protection
comparator output
Latch output
SOFT pin waveform
VMSW supply voltage
9.1V
No.A0695-19/21
LV8747T
(3) SOFT pin constant setting method (Soft start setting)
The switching regulator can be set to soft-start by connecting C between the SOFT pin and GND.
Determine the C value as follows :
Soft start time : Tsoft
Tsoft ≈ C × V/I [s]
V : Error amplifier input + pin voltage (NON5/NON6)
I : SOFT charge current TYP 1.6µA
(4). SCP pin constant setting method (Timer latch setting)
The time up to the output OFF in case of regulator output short-circuit can be set by connecting C between the SCP
pin and GND.
Determine the C value as follows :
Timer latch : Tscp
Tscp ≈ C × V/I [s]
V : Threshold voltage TYP 1.8V
I : SCP charge current TYP 2.5µA
(5) RT pin constant setting method (Capacitor charge/discharge current setting)
The CT pin capacitor charge/discharge current can be set for triangular wave generation by connecting R between the
RT pin and GND.
Determine the R value as follows :
Charge/discharge current : Irt
Irt ≈ V/R [A]
V : R pin voltage TYP 0.98V
(6) CT pin constant setting method (Triangular wave oscillation frequency setting)
The triangular wave oscillation can be set (together with the setting of charge/discharge current setting of RT pin) by
connecting C between the CT pin and GND.
Determine the C value as follows :
Triangular wave oscillation frequency : Fosc Fosc ≈ 1/{2×C×V/I} [Hz]
V : Triangle wave amplitude TYP 0.5V (Fosc = 10kHz)
*Note that the amplitude increases with the frequency.
I : Capacitor charge/discharge current. See the RT pin constant
setting method of (5).
No.A0695-20/21
LV8747T
Application Circuit
Logic input
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
17kΩ
8kΩ
1
2
3
4
5
6
7
8
9
GND
DT6 48
RT 47
20kΩ
PHA4
OUT4B
RNF4
CT 46
0.1µF
1Ω
1Ω
620pF
REG25 45
REG5 44
SCP 43
SOFT 42
VMSW 41
VREF12 40
CHOP 39
CP1 38
OUT4A
VM34
2.2µF
0.1µF
0.1µF
OUT3B
RNF3
+
-
0.01µF
20kΩ
+
-
OUT3A
10 PGND3
11 I03
1.5V
0.1µF
0.1µF
12 I13
CP2 37
13 PHA3
14 I02
VG 36
Logic input
I01 35
15 I12
I11 34
Logic input
16 PHA2
PHA1 33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
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PS No.A0967-21/21
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