AP2007SL-13 Diodes Inc, AP2007SL-13 Datasheet - Page 4

• Manufacturer Part Number: AP2007SL-13
• Description: IC BUCK SYNC 8SOIC
• Manufacturer: Diodes Inc
• Type: Step-Down (Buck)r

Specifications of AP2007SL-13

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Frequency - Switching: 200kHz
• Voltage - Input: 4.5 ~ 20 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• 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
• Current - Output: -
• Voltage - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: AP2007SLDITR

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
Anachip Corp
www.anachip.com.tw
12 Ω
330n
R1
C3
Typical Application Circuit
Virtual Frequency Control
Not Recommended for New Design
Frequency
of
1
2
3
4
the
GND
DRVN
VCC
DRVP
Vref
AP2007
Virtual
Control
VIRTUAL FREQ
SS/SHDN
OSCILLATOR
PHASE
+
-
ERROR
COMP
V
Figure 1: Virtual Frequency Control Loop-
REF
Frequency
FB
Synchronous single supply application.
330n
8
6
5
7
C4
combines
VFC Pulse
Control
1Ω Option
1Ω Option
10n
C5
CONTROL
the
FB Pulse
LOGIC
GATE
* Vout = 0.8 x (1+R3/R2)
R2
4/7
≅
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.
1K ~ 10K
V
IN
Q1
AF9435
Q2
AF9410
(4835)
(4412)
Option
D1
470u/16V
C1
Lout
Cout
10uH
L1
0.1u
C7
470u/16V
R2
1K
Vout
C2
0.1u
Rfb1
Rfb2
C8
C6
47n
R3
3K *
470u/16V
AP2007
Rev. 1.0 Apr 1, 2005
C9
Vout=3.2V*
Vin
+
+
-
-