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HA17524FP डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Switching Regulator Controller - Hitachi Semiconductor

भाग संख्या HA17524FP
समारोह Switching Regulator Controller
मैन्युफैक्चरर्स Hitachi Semiconductor 
लोगो Hitachi Semiconductor लोगो 
पूर्व दर्शन
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HA17524FP pdf
HA17524P/FP
Functional Description
Principals of HA17524 Operation
The HA17524 switching regulator circuit, using pulse width modulation (PWM), is constructed as shown
in figure 1.
Timing resistances RT and timing capacitance CT control the oscillation frequency. CT is charged by a
constant current generated by RT. Ramp signals (saw-tooth waves) at the CT terminal generated by this
oscillator is available for reference input signal to comparator which control the pulse width.
VREF
VCC 15
RT 6
CT 7
(Ramp)
Ref.
Volt.
+5 V
Osc.
+5V
16
+5 V to internal circuitry
OSC Out
3
+5V
Q
Flip Flop
Q
+5V
Comparator
+
+5V
NOR
NOR
INV. Input 1
NON-INV. Input 2
GND 8
Error Amp.
+
1k
10
9 COMP
+
C.L.
4 CL(+)
5 CL(—)
Current Limiter
SHUT 10k
DOWN
12 C1
Q1
11 E1
13 C2
Q2
14 E2
Figure 1 HA17524 Block Diagram
The reference voltage connects to the non-inverted or inverted input terminal of the error amplifier via
resistance divider (figure 2).
The output voltage from the error amplifier is compared with the ramp signal capacitance CT (figure 1).
The comparator can provide a signal with modulated pulse width.
This signal, then, controls output transistors Q1 and Q2, making an open loop to stabilize output voltage.
Outputs form the error amplifier the current limiter, and the shut-down circuit are connected together at the
comparator, so that an input signal from any one of these circuits can break the output stage.
2

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डाउनलोड[ HA17524FP Datasheet.PDF ]


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अनुशंसा डेटापत्रक

भाग संख्याविवरणविनिर्माण
HA17524FPSwitching Regulator ControllerHitachi Semiconductor
Hitachi Semiconductor


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