HA17524P Datasheet, PDF (9/18 Pages) Hitachi Semiconductor – Switching Regulator Controller

HA17524P/FP
Circuit Applications
Simplified inverting Regulator: Figure 10 shows the circuit configuration of HA17524 inverting regulator
for light load (V_OUT = –5 V)
V_CC = 15 V
5 k Ω ^{15 k Ω}
5 kΩ ^{5 kΩ}
0.1 µF
2 kΩ
0.01 µF
V_CC
INV Input
E₁
NON INV Input C₁
V_REF
C₂
R_T
E₂
C_T
CL(+)
SHUT DOWN CL(–)
Osc Out COMP
GND
20 µF
–5 V
20 mA
V_OUT
–
+
50 µF
Figure 10 Simple Polarity Conversion
Tracking Switching Regulator: Figure 11 shows the circuit configuration of a tracking regulator that uses a
transformer. (V_OUT = ±15 V)
V_CC = 5V
100µF
+
−
25kΩ
5kΩ
5kΩ
2kΩ
0.02µF
V_CC
INV.
Input
NON-INV.
Input
5kΩ
V_REF
R_T
C_T
SHUT
DOWN
OSC Out
E₁
C₁
C₂
E₂
CL(+)
CL(–)
COMP
GND
300Ω
1MΩ
200Ω 20T
+ ^+15V
50T ^50µF_−
50T
50µF
+
−
20mA
–15V
0.1µF
0.001µF ^{+−4.7µF}
620Ω
510Ω
1Ω
Figure 11 Tracking Switching Regulator
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