UA78S40PC View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

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UA78S40PC

Universal Switching Regulator Subsystem

Motorola => Freescale 

µA78S40

Figure 1. Output Switch On/Off Time

versus Oscillator Timing Capacitor

1000

VCC = 5.0 V

Ipk(sense) = VCC

Pin 10 = Gnd

Pin 9 = Vref

100

ton

toff

10

Figure 2. Standby Supply Current

versus Supply Voltage

3.2

CT = 0.001 µF

Ipk(sense) = VCC

Pin 3 = Gnd

2.4

1.6

0.8

1.0

0.1

1.0

10

100

CT, OSCILLATOR TIMING CAPACITOR (nF)

0

0 5.0 10 15 20 25 30 35 40

VCC, SUPPLY VOLTAGE (V)

Figure 3. Emitter–Follower Configuration

Output Switch Saturation Voltage

versus Emitter Current

1.6

VCC = 5.0 V

1.5 Pins 14, 15, 16 = VCC

Pins 10, 12 = Gnd

1.4 Pin 9 = Vref

1.3

1.2

1.1

1.0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

IE, EMITTER CURRENT (A)

Figure 4. Common–Emitter Configuration

Output Switch Saturation Voltage

versus Collector Current

1.2

VCC = 5.0 V

1.0

Pin 14 = VCC

Pins 3, 10, 12 = Gnd

Pin 9 = Vref

0.8

Darlington Connection

0.6

Forced Beta = 20

0.4

0.2

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

IC, COLLECTOR CURRENT (A)

4

MOTOROLA ANALOG IC DEVICE DATA

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