AP2011SL-13 Diodes Inc, AP2011SL-13 Datasheet - Page 6

• Manufacturer Part Number: AP2011SL-13
• Description: IC CTLR PWM BUCK W/VFC 14-SOIC
• Manufacturer: Diodes Inc
• Type: Step-Down (Buck)r

Specifications of AP2011SL-13

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Current - Output: 3A
• Frequency - Switching: 200kHz
• Voltage - Input: 10 ~ 40 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Switching Frequency: 200 KHz
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 0 % to 100 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: AP2011SLDITR

Synchronous PWM Controller
Virtual
advantages of constant frequency and constant
off-time control in a single mode of operation. This
allows fix frequency, precision switching voltage
regulator control with fast transient response and
the smallest solution size. Switch duty cycle can be
adjusted from 0% to 100% on a pulse by pulse basis
when responding to transient conditions. Both 0%
and 100% duty cycle operation can be maintained
for extended periods of time in response to load or
line transients. Figure 1 depicts a simplified
operation
Virtual frequency control is a technique that
provides stable, constant frequency of operation for
pulse controlled architectures such as constant
off-time/on-time. This is all done internal to the IC
with minimal number of components and without the
need for connections to external terminals such as
input and/or output. No external compensation is
Anachip Corp
www.anachip.com.tw
Virtual Frequency Control
Not Recommended for New Designs
Frequency
of
the
Virtual
Control 
Vref
VIRTUAL FREQ
OSCILLATOR
+
-
Figure 1: Virtual Frequency Control Loop-
ERROR
COMP
Frequency
Synchronous single supply application.
D
D
ON
ON
combines
VFC Pulse
> 0.1, 240-50 (1-
< 0.1,
Control
10000
the
5.9 - 0.01V
CONTROL
FB Pulse
LOGIC
GATE
×
×
6/9
V
OUT
technique: The VFC oscillator generates a pulse of
a known duration (VFC_Pulse). The regulator loop
responds by returning a complementary feedback
pulse (FB_Pulse). The FB_Pulse duration is a result
of external conditions such as inductor size, the
voltage across the inductor and the duration of the
VFC_Pulse. A VFC control loop is then formed
whereby the duration of the VFC_Pulse is modified
as a result of the FB_Pulse duration. The VFC loop
arrives at a state of equilibrium, where the operating
frequency remains inherently constant.
required,
performance fix frequency solution for switching
voltage regulators.
Virtual Frequency Control is a trademark of
PWRTEK, LLC.
V
OUT
V
/
V
IN
IN
V
IN
IN
) - V
IN
thus
Lout
Cout
providing
Vout
Rfb1
Rfb2
a
low
AP2011
Rev. 1.1 Apr 1, 2005
cost,
high