Diodes AP2004 Manuel d'utilisateur télécharger pdf (Page 4)

AP2004

PWM BUCK CONTROLLER

AP2004 Rev. 3 4 of 8 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

Electrical Characteristics (T

A

= 25ºC, V

CC

= 6V, f = 200 Khz)

Reference (REF)

Symbol Parameter Conditions Min Typ. Max Unit

V

REF

Comp connect to FB 1.225 1.25 1.275 V

Output voltage change with

temperature

T

A

= -20ºC ~ 25ºC -0.1 ±1 %

T

A

= 25ºC ~ 85ºC -0.2 ±1 %

Under voltage lockout (UVLO)

Symbol Parameter Conditions Min Typ. Max Unit

V

UT

Upper threshold voltage (V

CC

)

I

O(REF)

= 0.1mA

T

A

= 25ºC

2.9 V

V

LWT

Lower threshold voltage (V

CC

) 2.4 V

V

HT

Hysteresis (V

CC

) 500 mV

Short-circuit protection (SCP) control

Symbol Parameter Conditions Min Typ. Max Unit

V

IT

Input threshold voltage T

A

= 25ºC 0.60 0.67 0.75 V

V

STB

Standby voltage No pull up 100 130 160 mV

V

LT

Latched input voltage No pull up 50 100 mV

I

SCP

Input (source) current V

I

= 0.7V, T

A

= 25ºC -10 -15 -20 µA

V

CT

Comparator threshold voltage

(COMP)

1.5 V

Oscillator (OSC)

Symbol Parameter Conditions Min Typ. Max Unit

F

OSC

Frequency C

T

= 270 pF 200 KHz

ΔF

OSC

Standard deviation of frequency C

T

= 270 pF 10

%

Frequency change with voltage V

CC

= 3.6V ~ 20V 1

Error-amplifier

Symbol

Parameter Conditions Min Typ. Max Unit

V

IO

Input offset voltage V

O

(FB) = 1.25V ±6 mV

I

IO

Input offset current V

O

(FB) = 1.25V ±100 nA

I

IB

Input bias current V

O

(FB) = 1.25V 160 500 nA

V

CM

Common-mode input voltage range V

CC

= 3.6V ~ 20V 1.05 1.45 V

AV Open-loop voltage amplification R

F

= 200 kΩ 70 80 dB

GBW Unity-gain bandwidth 1.5 MHz

CMRR Common-mode rejection ratio 60 80 dB

V

OH

Max. output voltage V

ref

-0.1 V

V

OL

Min. output voltage 1 V

I

OI

Output (sink) current (COMP) V

ID

= -0.1V, V

O

= 1.25V 0.5 1.6 mA

I

OO

Output (source) current (COMP) V

ID

= 0.1V, V

O

= 1.25V -45 -70 µA

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