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PT1305

High Voltage Step-Up Converter

Unspecified 

SIMPLIFIED BLOCK DIAGRAM

PT1305

High Voltage Step-Up Converter

Figure 3. Simplified Block Diagram of the PT1305

OPERATION DESCRIPTION

The PT1305 uses a constant frequency, peak current

mode boost regulator architecture to regulate the output

voltage. The operation of the PT1305 can be

understood by referring to the simplified block diagram

shown above. At the start of each oscillator cycle, the

control logic turns on the power switch M1. The signal

at the non-inverting input of the PWM comparator is

proportional to the switch current, summed together

with a portion of the oscillator ramp. When this signal

reaches the level set by the output of error amplifier, the

PWM comparator resets the latch in the control logic

and turns off the power switch. In this manner, error

amplifier sets the correct peak current level to keep the

output voltage in regulation. If the feedback voltage

starts to drop, the output of the error amplifier increases.

This results in more current to flow through M1, hence

increasing the power delivered to the output.

TYPICAL PERFORMANCE CHARACTERISTICS

Load regulation

Feedback voltage Vs Temperature

18.20

18.19

18.18

18.17

18.16

18.15

18.14

18.13

18.12

18.11

18.10

18.09

18.08

18.07

18.06

18.05

18.04

18.03

18.02

18.01

Vin=2.7V

Vin=3.6V

Vin=5.0V

10

100

Output Current (mA)

1.265

1.260

1.255

VIN=3.6V

VOUT=18V@1mA

1.250

1.245

1.240

1.235

1.230

1.225

-60 -40 -20

0 20 40 60 80 100 120 140

Temperature(℃)

China Resources Powtech (Shanghai) Limited

PT1305_DS Rev EN_1.0

WWW.CRPOWTECH.COM

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