NJRC NJU7610 Pwm control step-up / flyback switching regulator ic Datasheet

NJU7600
PWM control Step-Up / Flyback switching regulator IC
■GENERAL DESCRIPTION
■PACKAGE OUTLINE
NJU7600 is a high speed low voltage operation switching
regulator control IC. It features a totem pole driver that can directly
drive an external MOS-FET.
Internal soft-start function, Dead time control and timer latch
function are included, requiring no external components. All
parameters can be optimized by additional external components for
design flexibility.
■FEATURES
● PWM switching control
● Operating Voltage
2.2V to 8V
● Wide Oscillator Range 300kHz to 1MHz
● Maximum Duty Cycle
90% typ.
● Quiescent Current
800µA typ.
● Soft-Start Function
Internal : 16ms typ. or adjustable
● Dead Time Control
● Timer Latch for Short Circuit Protection
● C-MOS Technology
● Package Outline
NJU7600M : DMP8
NJU7600RB1 : TVSP8
NJU7600M
NJU7600RB1
■PRODUCT VARIATION
NJU7601*
NJU7602*
PWM/PFM
Light Load to
Efficiency
Standby Function
Over Current Protection
NJU7600
NJU7610*
PWM Control
* Under Development
■PIN CONFIGURATION
1
8
2
7
3
6
4
5
NJU7600M
NJU7600RB1
Ver.2005-03-01
PIN FUNCTION
1. V+
2. FB
3. IN4. SCP
5. DTC
6. RT
7. GND
8. OUT
-1-
NJU7600
■BLOCK DIAGRAM
+
V
FB
0.8V
ER⋅AMP
IN1V
0.2V
Vref
Soft Start
UVLO
Latch
PWM
Buffer
2uA
SCP
OUT
SCP
OSC
2kΩ
0.5V
1V
0.74V
0.5
A
RT
1V
DTC
-2-
RT
GND
Ver.2005-03-01
NJU7600
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
Supply Voltage
V+
Output Pin Current
IO
Power Dissipation
PD
Operating Temperature Range
Storage Temperature Range
TOPR
TSTG
MAXIMUM RATINGS
+9
±50
DMP8 :300
TVSP8 :320
-40 ~ +85
-40 ~ +125
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER
SYMBOL
MIN.
Operating Voltage
V+
2.2
Oscillator Timing Resistor
RT
30
Oscillation Frequency
fOSC
300
TYP.
–
47
700
UNIT
V
mA
mW
°C
°C
MAX.
8
120
1,000
UNIT
V
kΩ
kHz
■ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER
Under Voltage Lockout Block
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
Soft Start Block
Soft Start Time
Short Circuit Protection Block
Input Threshold Voltage
Charge Current
Latch Mode
ON Threshold Voltage
Latch Mode
OFF Threshold Voltage
Oscillator Block
RT Pin Voltage
Oscillation Frequency
Oscillate Supply Voltage
Fluctuations
Oscillate Temperature
Fluctuations
Ver.2005-03-01
SYMBOL
VT_ON
VT_OFF
VHYS
TSS
TEST CONDITION
V+= L → H
V+= H → L
VT_ON → Duty=80%
MIN.
TYP.
MAX.
UNIT
1.9
1.8
60
2.0
1.9
100
2.1
2.0
–
V
V
mV
8
16
24
ms
VT_PC
ICHG
FB Pin
VSCP=0V
0.95
1.5
1.00
2
1.05
2.5
V
µA
VT_LA
SCP Pin
0.95
1.00
1.05
V
VT_LAOFF
SCP Pin
0.2
0.45
0.7
V
-5%
630
0.5
700
+5%
770
V
kHz
VRT
fOSC
fDV
V+=2.2V ~ 8V
–
1
–
%
fDT
Ta=-40°C ~ +85°C
–
3
–
%
-3-
NJU7600
■ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER
Error Amplifier Block
Reference Voltage
Input Bias Current
Open Loop Gain
Gain Bandwidth Product
Output Source Current
Output Sink Current
SYMBOL
TEST CONDITION
VB
IB
AV
GB
IOM+_1
IOM+_2
IOM-
VFB=1V, VIN-=0.9V
VFB=1V, VIN-=0.9V, V+=2.2V
VFB=1V, VIN-=1.1V
MIN.
TYP.
MAX.
UNIT
-1.5%
-0.1
–
–
25
4
0.10
1.00
–
80
1
55
9
0.16
+1.5%
0.1
–
–
95
16
0.22
V
µA
dB
MHz
mA
mA
mA
0.16
0.44
85
40
0.22
0.5
90
50
0.28
0.56
95
60
V
V
%
%
PWM Comparate Block
Input Threshold Voltage
Maximum Duty Cycle
Output Block
Output High Level
ON Resistance
Output Low Level
ON Resistance
General Characteristics
Quiescent Current
-4-
VT_0
VT_50
MAXDUTY_1
MAXDUTY_2
Duty=0%
Duty=50%
VFB=0.9V
VFB=0.9V, RDTC=47kΩ
ROH
IO=-20mA
–
10
20
Ω
ROL
IO=+20mA
–
5
10
Ω
RL=Non Load
–
800
1200
µA
IDD
Ver.2005-03-01
NJU7600
■ TYPICAL APPLICATIONS
Step-Up Converter
SBD
L
V
+
VOUT
CIN
R2
NJU7600
C
+
1
V
OUT
8
2
FB
GND
7
3
IN-
RT
6
4
SCP
DTC
5
CNF
COUT
FET
R1
RT
RNF
CSCP
RDTC
CS
Flyback Converter
T
+
V
SBD
VOUT
CIN
NJU7600
C
CNF
RNF
1
V
2
+
FET
OUT
8
FB
GND
7
3
IN-
RT
6
4
SCP
DTC
5
COUT
R1
RT
CSCP
Ver.2005-03-01
R2
RDTC
CS
-5-
NJU7600
■TYPICAL CHARACTERISTICS
Oscillation Frequency vs. Timing Resistance
+
90
AX
UTY_1
95
100
10
85
80
100
100
Timing Resistance RT (kΩ)
1000
Oscillator Frequency fOSC (kHz)
Duty Cycle vs. R
DTC
Oscillation Frequency fosc (kHz)
Oscillation Frequency vs. Operating Voltage
Duty Cycle MAXDUTY (%)
720
700
680
660
80
60
40
20
0
0
20
40
60
80
100
Dead Time Control Resistance RDTC (kΩ)
Reference Voltage vs. Operating Voltage
Quiescent Current vs. Operating Voltage
2
4
6
8
+
Operating Voltage V (V)
o
o
(V =3.3V, Ta=25 C)
Quiescent Current IDD (uA)
1
0.998
0
2
4
6
8
+
Operating Voltage V (V)
(R =47kΩ, R =Non Load, Ta=25 C)
T
1400
1.002
-6-
T
10
0
1.004
0.996
(V =3.3V, R =47kΩ, Ta=25 C)
100
T
740
o
+
(R =47kΩ, Ta=25oC)
+
Reference Voltage VB (V)
o
(V =3.3V, Ta=25 C)
100
Maximum Duty Cycle
M D
(%)
1000
Oscillation Frequency fOSC (kHz)
Maximum Duty Cycle vs. Oscillator Frequency
(V+=3.3V, Ta=25oC)
10
L
1200
1000
800
600
400
200
0
0
2
4
6
8
+
Operating Voltage V (V)
10
Ver.2005-03-01
NJU7600
■TYPICAL CHARACTERISTICS
Error Amplifier Block
Voltage Gain, Phase vs. Frequency
+
o
(V =3.3V, Gain=40dB, Ta=25 C)
Gain
30
90
15
45
+
V =1.95V
14
V+=3.3V
6
4
V+=8V
2
0
-50
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
100
V+=3.3V
10
V+=1.95V
1
-50
Ver.2005-03-01
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Output Sink Current IOM- (mA)
Error Amplifier Block
Output Source Current vs. Temperature
(VFB=1V, VIN-=0.9V)
V+=8V
0
10000
Output Block
Output Low Level ON Resistance
vs. Temperature (Io=+20mA)
12
10
8
OH
Output High Level ON Resistance
R
(Ω)
10
100
1000
Frequency f (kHz)
10
1000
Output Source Current IOM+ (mA)
1
Output Block
Output High Level ON Resistance
vs. Temperature (Io=-20mA)
12
135
Phase
0
0.1
14
180
Phase Φ (deg)
45
Output Low Level ON Resistance
ROL (Ω)
Voltage Gain Av (dB)
60
V+=1.95V
8
6
V+=3.3V
4
2
0
-50
0.2
0.15
V+=8V
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Error Amplifier Block
Output Sink Current vs. Temperature
(VFB=1V, VIN-=1.1V)
V+=1.95V, 3.3V, 8V
0.1
0.05
0
-50
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
-7-
NJU7600
■TYPICAL CHARACTERISTICS
Soft Start Time vs. Temperature
Reference Voltage vs. Temperature
+
(V =3.3V)
24
Reference Voltage VB (V)
Soft Start Time Tss (ms)
22
20
1.005
18
16
14
12
1
0.995
10
8
-50
(V+=3.3V)
1.01
0.99
-50
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
Oscillator Frequency vs. Temperature
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
Muximum Duty Cycle vs. Temperature
+
Muximum Duty Cycle
M D
(%)
680
660
-8-
MAX DUTY_1
70
VT_ON
V
T_OFF
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
60
MAX DUTY_2
50
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
Quiescent Current vs. Temperature
Under Voltage Lockout Block
vs. Temperature
1.94
1.86
-50
80
40
-50
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
2.02
1.9
90
AX
700
1.98
(V+=3.3V)
UTY
720
640
-50
100
T
740
2.06
Threshold Voltage (V)
(V =3.3V, R =47kΩ)
1000
Quiescent Current IDD (uA)
Oscillator Frequency fOSC (kHz)
760
(V+=3.3V, R =47kΩ)
T
800
600
400
200
0
-50
-25
0
25 50 75 100 125
Ambient Temperature Ta (oC)
Ver.2005-03-01
NJU7600
MEMO
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
Ver.2005-03-01
-9-
Similar pages