gm34063 Gamma Microelectronics, gm34063 Datasheet - Page 8

• Manufacturer Part Number: gm34063
• Description: Gm34063 1.5a Dc-to-dc Converter Control Circuit
• Manufacturer: Gamma Microelectronics

8
Step - Down Converter
Figure 8. External Current Buck Connections for I Peak Greater than 1.5A
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
Output Ripple With Optional Fitter
25 V
MICROELECTRONICS
V
IN
A
+
100
R
0.33
1.2k
Test
SC
R1
A
8
7
6
5
3.6k
R2
V
CC
Osc.
I
pk
Comp.
+
-
C
T
S
R
Reference
Regulator
Q
V
V
1.25V
IN
IN
100
= 25 V,
= 15 V to 25 V, I = 500 mA
V
V
V
Q2
V
IN
IN
IN
IN
= 25 V,
= 25 V,
1.5A DC-to-DC CONVERTER CONTROL CIRCUIT
= 25 V,
Conditions
= 25 V,
I
O
Q1
= 75mA to 500 mA
I
I
I
O
O
O
R
3
4
Power Management
1N5819
1
2
C
470pF
= 500 mA
= 500 mA
=500 mA
L
T
= 0.1W
O
470
L
C
+
C
220 µH
O
5.0 V / 500 mA
V
OUT
12 mV = ± 0.15%
3.5mV = ± 0.03%
120 mVpp
Results
GM34063
40 mVpp
1.0 µH
Optional
83.7%
1.1 A
Filter
+
100
V
OUT