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PDF GM3843A Datasheet ( Hoja de datos )

Número de pieza GM3843A
Descripción (GM3842A - GM3845A) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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GM3843A datasheet

1 Page

GM3843A pdf
ELECTRICAL CHARACTERISTICS
(TA = 0°C to 70°C, *VCC=15V, CT=3.3nF, RT=10kW, unless otherwise specified )
CHARACTERISTICS
SYMBOL
Reference Section
Reference Output Voltage
Line Regulation
Load Regulation
Short Circuit Output Current
Oscillator Section
Oscillation Frequency
Frequency Change with Voltage
Oscillator Amplitude
Error Amplifier Section
Input Bias Current
Input Voltage
Open Loop Voltage Gain
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
Current Sense Section
Current Sense Input Voltage Gain
Maximum Input Signal
Supply Voltage Rejection
Input Bias Current
Output Section
VREF
DVREF
DVREF
ISC
f
Df/ DVCC
V(OSC)
IBIAS
VI(EA)
AVOL
PSRR
ISINK
ISOURCE
VOH
VOL
GV
VI(MAX)
SVR
IBIAS
Low Output Voltage
VOL
High Output Voltage
VOH
Rise Time
Fall Time
Undervoltage Lockout Section
tR
tF
Start Threshold
VTH(ST)
Minimum Operating Voltage
(after tum ON)
VOPR(MIN)
TEST CONDITIONS
TJ= 25°C, IREF= 1mA
12V VCC 25V
1mA IREF 20mA
TA=25°C
TJ= 25°C
12V VCC 25V
(Peak to Peak)
VFB= 3V
VPIN1=2.5V
2V VO 4V
12V VCC 25V
VPIN2=2.7V, VPIN1=1.1V
VPIN2=2.3V, VPIN1=5V
VPIN2=2.3V, RL=15kW to GND
VPIN2=2.7V, RL=15kW to PIN8
(Note 1 and 2)
VPIN1=5V (Note 1)
12V VCC 25V (Note 1)
VPIN3=3V
ISINK= 20mA
ISINK= 200mA
ISOURCE= 20mA
ISOURCE= 200mA
TJ= 25°C, CL= 1nF(Note 3)
TJ= 25°C, CL= 1nF(Note 3)
GM3842A, GM3844A
GM3843A, GM3845A
GM3842A, GM3844A
GM3843A, GM3845A
MIN
4.9
47
2.42
65
60
2
-0.5
5.0
2.85
0.9
13
12
14.5
7.8
8.5
7.0
TYP MAX UNIT
5.0
6.0
6.0
-100
52
0.05
1.6
-0.1
2.5
90
70
7
-1.0
6.0
0.8
3.0
1.0
70
-3.0
0.08
1.4
13.5
13
45
35
16.0
8.4
10
7.6
5.1
20
25
-180
57
1.0
-2
2.58
1.1
3.15
1.1
-10
0.4
2.2
150
150
17.5
9.0
11.5
8.2
V
mV
mV
mA
kHz
%
V
µA
V
dB
dB
mA
mA
V
V
V/ V
V
dB
µA
V
V
nS
nS
V
V
5

5 Page

GM3843A arduino
Figure 10. External Clock Synchronization
External 0.01
Sync
Input
* The diode clamp is required if the Sync amplitude is
large enough to cause the bottom side of CT to go
more than 300 mV below ground.
8
Vref
RT
4
CT
47
2
1
R
Internal
R Bias
Oscillartor
+
+
-
Error
Amplifier
2R
R
5
Figure 11. External DUTY CYCLE CLAMP and multi-unit synchronization
8
RA
8
4
RB 5.0k
6
+
-
R
5Q
5.0k
2
+
-
S
C 5.0k
1
R
Internal
Bias
R
34
Oscillator
+
7
+
2-
2R
Error
1 Amplifier
R
GND 5
To Additional GM384XA series
f= 1.44
(RA + 2RB) C
Dmax
RB
RA + 2RB
11

11 Page





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