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PDF GM3844A Data sheet ( Hoja de datos )
| Número de pieza | GM3844A | |
| Descripción | (GM3842A - GM3845A) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | |
| Fabricantes | Gamma | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de GM3844A (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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Description
GM384XA series is high performance with fixed-frequency
current mode PWM controllers. They are specially de-
signed for off-Line and DC-to-DC converter applications.
They require minimal external components to precisely tai-
lor performance in a wide variety of applications.
GM384XA series includes a trimmed oscillator for precise
duty cycle control, a temperature-compensated reference,
high gain error amplifier, a current-sensing comparator,
and a high-current totem pole output for driving a power
MOSFET.
On-chip protection features include undervoltage lockouts
with hysteresis for both input and reference, cycle-by-cycle
current limiting, programmable output deadtime, and a
latch for single pulse metering. All these are in a simple
DIP-8 or SOP-8 package!
GM3842A and GM3844A have UVLO thresholds of 16V
(on)/10V(off); GM3843A and GM3845A have UVLO thresh-
olds of 8.4V (on)/ 7.6V (off). GM3842A and GM3843A oper-
ate within 100% duty cycle; GM3844A and GM3845A oper-
ate within 50% duty cycle.
Features
Low Start-Up and Operating Current
Automatic Feed Forward Compensation
Current Mode Operating Frequency up to
500kHz
Trimmed Oscillator Discharge Current for
Precise Duty Cycle Control
Latching PWM for Cycle-By-Cycle Current
Limiting
Undervoltage Lockout with Hysteresis
High Current Totem Pole Output
The GM384XA Have Start-up Current 0.17mA
SIMPLIFIED BLOCK DIAGRAM
Vref 8
RT/ CT 4
Voltage Feedback Input 2
Output Compensation 1
5.0V
REFERENCE
R
R VREF
Undervoltage
LOCKOUT
VCC
7
VCC
Undervoltage
LOCKOUT
OSCILLATOR
Error
Amplifier
+
-
Latching
PWM
5
GND
7 VC
6 Output
5 Power Ground
3 Current Sense Input
www.gammamicro.com 1
1 page  
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 
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 | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet GM3844A.PDF ] | |
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