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IP1844J [ETC]

Current-Mode SMPS Controller ; 电流模式开关电源控制器\n
IP1844J
型号： IP1844J
厂家： ETC    ETC
描述：

Current-Mode SMPS Controller
电流模式开关电源控制器\n

开关 控制器
文件： 总6页 (文件大小：72K)
中文：  中文翻译
下载：  下载PDF数据表文档文件
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IP1844 SERIES  
IP1845 SERIES  
SEME  
LAB  
TOP VIEW  
CURRENT MODE  
1
2
3
4
8
7
6
5
VREF  
COMP  
VCC  
VFB  
REGULATING  
PULSE WIDTH  
MODULATORS  
ISENSE  
RT /CT  
OUTPUT  
GROUND  
J Package – 8 Pin Ceramic DIP  
N Package – 8 Pin Plastic DIP  
FEATURES  
D-8 Package – 8 Pin Plastic (150) SOIC  
• Guaranteed ±1% reference voltage tolerance  
TOP VIEW  
• Guaranteed ±10% frequency tolerance  
14  
13  
12  
11  
10  
9
1
2
3
4
5
6
7
VREF  
COMP  
N/C  
µ
• Low start–up current (<500 A)  
N/C  
• Under voltage lockout with hysteresis  
VFB  
VCC  
• Output state completely defined for all supply  
and input conditions  
N/C  
VC  
• Interchangeable with UC1844 and UC1845  
series for improved operation  
ISENSE  
N/C  
OUTPUT  
GROUND  
• 500kHz Oscillator operation  
250kHz Output operation  
POWER  
GROUND  
8
RT /CT  
D-14 Package – 14 Pin Plastic (150) SOIC  
Order Information  
Part  
Number  
J–Pack  
8 Pin  
N–Pack  
8 Pin  
D–8  
8 Pin  
D–14  
14 Pin  
Temp.  
Range  
Note:  
To order, add the package identifier to the  
part number.  
IP1844  
IP2844  
IP3844  
IP1845  
IP2845  
IP3845  
✔
✔
✔
✔
✔
✔
-55 to +125°C  
-25 to +85°C  
0 to +70°C  
-55 to +125°C  
-25 to +85°C  
0 to +70°C  
✔
✔
✔
✔
✔
✔
eg.  
IP1844D–14  
IP3845J  
✔
✔
✔
✔
✔
✔
ABSOLUTE MAXIMUM RATINGS (T  
= 25°C unless otherwise stated)  
case  
(low impedance source)  
V
Supply Voltage  
+30V  
Self limiting  
CC  
(I < 30mA)  
CC  
I
Output Current  
±1A  
O
Output Energy  
(capacitive load)  
(pins 2 and 3)  
5µJ  
Analog Inputs  
–0.3V to +V  
10mA  
CC  
Error Amp Output Sink Current  
Power Dissipation  
P
P
P
T
T
T
= 25°C  
= 25°C  
= 25°C  
J, N Packages  
D Package  
1W  
10mW/°C  
D
D
D
amb  
case  
case  
Derate @ T  
> 50°C  
amb  
Power Dissipation  
Derate @ T > 50°C  
725mW  
7.25mW/°C  
amb  
Power Dissipation  
Derate @ T > 25°C  
J, N Packages  
2W  
16mW/°C  
case  
T
T
Storage Temperature Range  
Lead Temperature  
–65 to 150°C  
+300°C  
STG  
(soldering, 10 seconds)  
L
Prelim. 2/95  
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.  
IP1844 SERIES  
IP1845 SERIES  
SEME  
LAB  
DESCRIPTION  
The IP1844 and IP1845 series of switching regulator control circuits contain all the functions necessary to  
implement off-line, current mode switching regulators, using a minimum number of external parts.  
Functions included are voltage reference, error amplifier, current sense comparator, oscillator, totem-pole output  
driver and under-voltage lockout circuitry. In addition there is a toggle flip-flop which blanks the output on every  
second clock pulse, thereby ensuring that the duty cycle never exceeds 50%.  
Although pin compatible with the UC1844 and UC1845 series, SEMELAB has incorporated several improvements  
in the IP1844 and IP1845 series allowing tighter and more complete specification of electrical performance .  
BLOCK DIAGRAM  
7/12  
VCC  
UNDER–VOLTAGE  
LOCKOUT  
34V  
8/14  
ENABLE  
5V  
REFERENCE  
REGULATOR  
V
REF  
5/9  
GND  
16V  
(8.4V)  
INTERNAL  
BIAS  
6V  
(0.5V)  
2.5V  
REG  
VREF STATUS  
LATCH  
S
R
7/11VC  
3.6V  
4/7  
6/10OUTPUT  
RT /CT  
OSCILLATOR  
Q
TOGGLE  
FLIP  
FLOP  
5/8  
POWER  
GROUND  
T
ERROR  
AMP  
S
R
2R  
2/3  
1/1  
PWM  
LATCH  
VFB  
R
1V  
C
OMP  
Values in brackets are for IP1845 series.  
CURRENT  
SENSE  
COMPARATOR  
PIN NUMBERS  
1st Number – N, J and 8 Pin D Packages  
2nd Number – 14 Pin D Package.  
3/5  
ISENSE  
RECOMMENDED OPERATING CONDITIONS  
V
Supply Voltage  
Output Current  
Analog Inputs  
≤ 30V  
CC  
I
0 to ±200mA  
–0.3V to 3V  
0 to 2mA  
O
(pins 2 and 3)  
Error Amp Output Sink Current  
IP1844 , IP1845  
IP2844 , IP2845  
IP3844 , IP3845  
–55 to 125°C  
–25 to 85°C  
0 to 70°C  
Operating Ambient Temperature Range  
Prelim. 2/95  
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.  
IP1844 SERIES  
IP1845 SERIES  
SEME  
LAB  
ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated)  
IP1844/IP1845  
IP2844/IP2845  
IP3844  
IP3845  
Typ.  
Parameter  
Test Conditions  
Min.  
Typ.  
Max.  
Min.  
Max. Units  
REFERENCE SECTION  
Output Voltage  
Input Regulation  
Output Regulation  
I
O = 1mA  
CC = 12V to 25V  
O = 1mA to 20mA  
TJ = 25°C  
4.95  
5.00  
6
5.05  
20  
4.90  
5.00  
6
5.10  
20  
V
V
mV  
I
6
25  
6
25  
mV  
°C  
Temperature Stability  
0.2  
0.4  
0.2  
0.4  
Total Output Variation  
Output Noise Voltage  
Long Term Stability  
Output Short Circuit  
Current  
Line, Load, Temp  
f = 10Hz to 10kHz  
4.90  
5.10  
4.82  
5.18  
V
TJ = 25°C  
50  
5
50  
5
µV  
mV  
TJ = 125°C @ 1000Hrs  
25  
25  
V
REF = 0  
30  
47  
80  
160  
30  
47  
80  
160  
mA  
OSCILLATOR SECTION  
Frequency  
TJ = 25°C  
52  
0.2  
5
57  
1
52  
0.2  
5
57  
1
kHz  
%
Voltage stability  
Temperature Stability  
Amplitude  
V
CC = 12V to 25V  
∆TA = Min to Max  
PIN4 Peak to Peak  
%
V
1.7  
8.3  
8
1.7  
8.3  
8
V
TJ = 25°C  
mA  
%
Discharge Current  
∆TA = Min to Max  
ERROR AMP SECTION  
Input Voltage  
VPIN1 = 2.5V  
2.45  
2.50  
–0.3  
2.55  
–1  
2.42  
2.50  
–0.3  
2.58  
–2  
V
Input Bias Current  
Open Loop Voltage  
Gain  
µA  
VO = 2V to 4V  
65  
0.7  
60  
90  
1
65  
0.7  
60  
90  
1
dB  
MHz  
dB  
Unity Gain Bandwidth  
Supply Voltage  
Rejection  
VCC = 12V to 25V  
70  
70  
Output Sink Current  
Output Source Current  
VPIN2 = 2.7V  
VPIN2 = 2.3V  
VPIN2 = 2.3V  
VPIN2 = 2.7V  
VPIN1 = 1.1V  
VPIN1 = 5.0V  
RL = 15kΩ  
2
6
2
6
mA  
V
–0.5  
5.0  
–0.8  
6.0  
0.7  
–0.5  
5.0  
–0.8  
6.0  
0.7  
V
V
OUT High  
OUT Low  
RL = 15kΩ  
1.1  
1.1  
NOTES  
1. Test Conditions unless otherwise stated:  
CC = 15V* , RT = 10kΩ , CT = 3.3nF , f = 52kHz.  
V
*Adjust VCC above start threshold before setting at required level.  
All specifications apply over the full operating temperature range  
unless otherwise stated. (See Ordering Information for further details).  
Prelim. 2/95  
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.  
IP1844 SERIES  
IP1845 SERIES  
SEME  
LAB  
ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated)  
IP1844/IP1845  
IP2844/IP2845  
IP3844  
IP3845  
Typ.  
Parameter  
Test Conditions  
Min.  
Typ.  
Max.  
Min.  
Max. Units  
CURRENT SENSE SECTION  
Gain  
See Notes 2,3  
2.85  
0.9  
3
1
3.15  
1.1  
2.85  
0.9  
3
1
3.15  
1.1  
V/V  
V
Maximum Input Signal  
Supply Voltage  
Rejection  
VPIN1 = 5.0V  
(Note 2)  
VC = 12V to 25V  
60  
70  
60  
70  
dB  
Input Bias Current  
Delay to Output  
–2  
–10  
300  
–2  
–10  
300  
µA  
150  
150  
ns  
OUTPUT SECTION  
ISINK = 20mA  
0.1  
1.5  
13.5  
13.5  
50  
0.4  
2.2  
0.1  
1.5  
13.5  
13.5  
50  
0.4  
2.2  
Output Low Level  
Output High Level  
V
V
I
I
I
SINK = 200mA  
SOURCE = 20mA  
SOURCE = 200mA  
13  
12  
13  
12  
Rise Time  
CL = 1nF  
CL = 1nF  
150  
150  
1.1  
150  
150  
1.1  
ns  
V
Fall Time  
50  
50  
UVLO Saturation  
VCC = 6V  
IL = 1mA  
0.7  
0.7  
UNDER–VOLTAGE LOCKOUT SECTION  
Upper Threshold  
1844 Series  
15  
7.8  
9
16  
8.4  
10  
17  
9
14.5  
7.8  
8.5  
7
16  
8.4  
10  
17.5  
9
V
V
(VCC  
Lower Threshold  
(VCC  
)
1845 Series  
1844 Series  
11  
8.2  
11.5  
8.2  
)
1845 Series  
7
7.6  
7.6  
TOTAL STANDBY CURRENT  
Start–up Current  
Operating Supply  
Current  
0.3  
11  
14  
34  
0.5  
15  
17  
40  
0.3  
11  
14  
34  
0.5  
15  
17  
40  
mA  
mA  
V
V
PIN2 = 0V  
PIN3 = 0V  
1844 Series  
1845 Series  
V
VCC Zener Voltage  
I
CC = 25mA  
30  
47  
30  
46  
PWM SECTION  
Maximum Duty Cycle  
Minimum Duty Cycle  
48  
50  
0
48  
50  
0
%
NOTES  
1. Test Conditions unless otherwise stated:  
CC = 15V* , RT = 10kΩ , CT = 3.3nF , f = 52kHz.  
2. Parameter measured at trip point of latch with  
V
V
= 0V  
PIN2  
*Adjust VCC above start threshold before setting at  
required level.  
3. Gain defined as:  
∆V  
∆V  
PIN1  
PIN3  
A =  
0 ≤ V  
≤ 0.8  
All specifications apply over the full operating temperature  
range unless otherwise stated.  
PIN3  
(See Ordering Information for further details).  
Prelim. 2/95  
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.  
IP1844 SERIES  
IP1845 SERIES  
SEME  
LAB  
APPLICATIONS INFORMATION  
Oscillator Waveforms and Maximum Duty Cycle  
LARGE R T  
SMALL C T  
V - Pin 4  
(Pin 7 for 14 Pin D Package)  
Internal Clock  
VREF  
R T C T  
GND  
8
4
5
R T  
Output – Max. Duty Cycle  
V - Pin 6  
(Pin 10 for 14 Pin D Package)  
C T  
SMALL R T  
LARGE C T  
V - Pin 4  
(Pin 7 for 14 Pin D Package)  
Internal Clock  
Output – Max. Duty Cycle  
V - Pin 6  
(Pin 10 for 14 Pin D Package)  
Oscillator timing capacitor C is charged by V  
through R and discharged by an  
T
T
REF  
internal current source. During the discharge time, the internal clock signal blanks the  
output to the low state. Selection of R and C therefore determines both oscillator  
T
T
frequency and maximum duty cycle.  
Charge and discharge times are determined by the formulae:  
t ≈ 0.55 RTCT  
For RT > 5kΩ,  
c
.0063 R – 2.3  
1.8  
(RTCT)  
T
t ≈ RTCT Rn  
Resultant frequency f ≈  
d
(
)
.0063 – 4  
1
Resultant frequency f =  
(t + t )  
c
d
Prelim. 2/95  
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.  
IP1844 SERIES  
IP1845 SERIES  
SEME  
LAB  
APPLICATIONS INFORMATION  
Open–Loop Laboratory Test Fixture  
VREF  
R T  
VCC  
4.7k  
1k  
Ω
Ω
2N2222  
1
2
3
4
8
7
6
5
COMP  
VREF  
0.1  
100k  
Ω
µ
F
0.1  
VFB  
VCC  
ERROR AMP  
ADJUST  
µ
F
1k  
Ω
1kW  
5k  
Ω
ISENSE  
ISENSE  
O/P  
OUTPUT  
GROUND  
ADJUST  
4.7k  
Ω
R T /C T  
GND  
C T  
High peak current associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should  
be connected close to pin 5 in a single point ground. The transistor and 5K potentiometer are used to sample the oscillator wave  
form and apply an adjustable ramp to pin 3.  
TYPICAL PERFORMANCE CHARACTERISTICS  
ERROR AMPLIFIER OPEN-LOOP  
OUTPUT SATURATION CHARACTERISTICS  
FREQUENCY RESPONSE  
4
3
2
1
0
100  
80  
60  
40  
20  
0
0
VCC = 15V  
TA = 25˚C  
TA = –55˚C  
–45  
–90  
–135  
–180  
SOURCE SAT (VCC- VOH  
)
AV  
SINK SAT (VOL  
)
10  
100  
1k  
10k  
100k  
1M  
10M  
.01  
.02  
.03 .04 .05  
.07  
.1  
.2  
.3  
.4 .5  
.7  
1.0  
OUTPUT CURRENT, SOURCE / SINK (A)  
FREQUENCY (Hz)  
UNDER VOLTAGE LOCKOUT  
1844 SERIES  
UNDER VOLTAGE LOCKOUT  
1845 SERIES  
20  
15  
10  
0.5  
0
20  
15  
10  
0.5  
0
0
5
10  
15  
20  
0
2.5  
5
7.5  
10  
VCC (V)  
VCC (V)  
Prelim. 2/95  
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.  

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